diff --git a/README.md b/README.md
index 800375e..b29005a 100644
--- a/README.md
+++ b/README.md
@@ -71,12 +71,13 @@ make it work with JUnit 5. Feel free to use the code (in package ```de.platon42.
 ### V0.4 (unreleased)
 
 - Enhancement: Added Structure View filters.
+- New: Added inspection to validate the correctness of a MC68000 instruction regarding operation size and address modes.
 
 ### V0.3 (28-Jul-21)
 
 - Enhancement: Macro contents are no longer parsed, added syntax highlighting options for macros.
 - Enhancement: Macro definitions are now word and stub indexed, macro calls reference to definition.
-- Enhancement: Macro definition refactoring and find usages support.
+- New: Macro definition refactoring and find usages support.
 - Enhancement: Structural View also shows macro definitions.
 - Bugfix: Missing REPT and ENDR assembler directives added.
 - Cosmetics: Changed or added some icons at various places.
diff --git a/build.gradle b/build.gradle
index bf3f918..dc80e7d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ plugins {
 }
 
 group = 'de.platon42'
-version = '0.3'
+version = '0.4'
 sourceCompatibility = "1.8"
 targetCompatibility = "1.8"
 
@@ -60,12 +60,13 @@ patchPluginXml {
   <h4>V0.4 (unreleased)</h4>
     <ul>
       <li>Enhancement: Added Structure View filters.
+      <li>New: Added inspection to validate the correctness of a MC68000 instruction regarding operation size and address modes.
     </ul>
   <h4>V0.3 (28-Jul-21)</h4>
     <ul>
       <li>Enhancement: Macro contents are no longer parsed, added syntax highlighting options for macros.
       <li>Enhancement: Macro definitions are now word and stub indexed, macro calls reference to definition.
-      <li>Enhancement: Macro definition refactoring and find usages support.
+      <li>New: Macro definition refactoring and find usages support.
       <li>Enhancement: Structural View also shows macro definitions. 
       <li>Bugfix: Missing REPT and ENDR assembler directives added.
       <li>Cosmetics: Changed or added some icons at various places.
diff --git a/src/main/gen/de/platon42/intellij/plugins/m68k/parser/M68kParser.java b/src/main/gen/de/platon42/intellij/plugins/m68k/parser/M68kParser.java
index 06bcecd..5d37a24 100644
--- a/src/main/gen/de/platon42/intellij/plugins/m68k/parser/M68kParser.java
+++ b/src/main/gen/de/platon42/intellij/plugins/m68k/parser/M68kParser.java
@@ -364,12 +364,12 @@ public class M68kParser implements PsiParser, LightPsiParser {
     // MNEMONIC OperandSize?
     public static boolean AsmOp(PsiBuilder b, int l) {
         if (!recursion_guard_(b, l, "AsmOp")) return false;
-        if (!nextTokenIs(b, MNEMONIC)) return false;
+        if (!nextTokenIs(b, "<mnemonic>", MNEMONIC)) return false;
         boolean r;
-        Marker m = enter_section_(b);
+        Marker m = enter_section_(b, l, _NONE_, ASM_OP, "<mnemonic>");
         r = consumeToken(b, MNEMONIC);
         r = r && AsmOp_1(b, l + 1);
-        exit_section_(b, m, ASM_OP, r);
+        exit_section_(b, l, m, r, false, null);
         return r;
     }
 
diff --git a/src/main/gen/de/platon42/intellij/plugins/m68k/psi/M68kAsmOp.java b/src/main/gen/de/platon42/intellij/plugins/m68k/psi/M68kAsmOp.java
index 1f7d5be..3b8d330 100644
--- a/src/main/gen/de/platon42/intellij/plugins/m68k/psi/M68kAsmOp.java
+++ b/src/main/gen/de/platon42/intellij/plugins/m68k/psi/M68kAsmOp.java
@@ -1,6 +1,7 @@
 // This is a generated file. Not intended for manual editing.
 package de.platon42.intellij.plugins.m68k.psi;
 
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 public interface M68kAsmOp extends M68kPsiElement {
@@ -8,4 +9,9 @@ public interface M68kAsmOp extends M68kPsiElement {
     @Nullable
     M68kOperandSize getOperandSize();
 
+    @NotNull
+    String getMnemonic();
+
+    int getOpSize();
+
 }
diff --git a/src/main/gen/de/platon42/intellij/plugins/m68k/psi/M68kOperandSize.java b/src/main/gen/de/platon42/intellij/plugins/m68k/psi/M68kOperandSize.java
index 62cd8c6..86a48a8 100644
--- a/src/main/gen/de/platon42/intellij/plugins/m68k/psi/M68kOperandSize.java
+++ b/src/main/gen/de/platon42/intellij/plugins/m68k/psi/M68kOperandSize.java
@@ -3,4 +3,6 @@ package de.platon42.intellij.plugins.m68k.psi;
 
 public interface M68kOperandSize extends M68kPsiElement {
 
+    int getSize();
+
 }
diff --git a/src/main/gen/de/platon42/intellij/plugins/m68k/psi/impl/M68kAsmOpImpl.java b/src/main/gen/de/platon42/intellij/plugins/m68k/psi/impl/M68kAsmOpImpl.java
index 179ce43..1dc2dfd 100644
--- a/src/main/gen/de/platon42/intellij/plugins/m68k/psi/impl/M68kAsmOpImpl.java
+++ b/src/main/gen/de/platon42/intellij/plugins/m68k/psi/impl/M68kAsmOpImpl.java
@@ -7,6 +7,7 @@ import com.intellij.psi.PsiElementVisitor;
 import com.intellij.psi.util.PsiTreeUtil;
 import de.platon42.intellij.plugins.m68k.psi.M68kAsmOp;
 import de.platon42.intellij.plugins.m68k.psi.M68kOperandSize;
+import de.platon42.intellij.plugins.m68k.psi.M68kPsiImplUtil;
 import de.platon42.intellij.plugins.m68k.psi.M68kVisitor;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -33,4 +34,15 @@ public class M68kAsmOpImpl extends ASTWrapperPsiElement implements M68kAsmOp {
         return PsiTreeUtil.getChildOfType(this, M68kOperandSize.class);
     }
 
+    @Override
+    @NotNull
+    public String getMnemonic() {
+        return M68kPsiImplUtil.getMnemonic(this);
+    }
+
+    @Override
+    public int getOpSize() {
+        return M68kPsiImplUtil.getOpSize(this);
+    }
+
 }
diff --git a/src/main/gen/de/platon42/intellij/plugins/m68k/psi/impl/M68kOperandSizeImpl.java b/src/main/gen/de/platon42/intellij/plugins/m68k/psi/impl/M68kOperandSizeImpl.java
index 2a07c99..146db93 100644
--- a/src/main/gen/de/platon42/intellij/plugins/m68k/psi/impl/M68kOperandSizeImpl.java
+++ b/src/main/gen/de/platon42/intellij/plugins/m68k/psi/impl/M68kOperandSizeImpl.java
@@ -5,6 +5,7 @@ import com.intellij.extapi.psi.ASTWrapperPsiElement;
 import com.intellij.lang.ASTNode;
 import com.intellij.psi.PsiElementVisitor;
 import de.platon42.intellij.plugins.m68k.psi.M68kOperandSize;
+import de.platon42.intellij.plugins.m68k.psi.M68kPsiImplUtil;
 import de.platon42.intellij.plugins.m68k.psi.M68kVisitor;
 import org.jetbrains.annotations.NotNull;
 
@@ -24,4 +25,9 @@ public class M68kOperandSizeImpl extends ASTWrapperPsiElement implements M68kOpe
         else super.accept(visitor);
     }
 
+    @Override
+    public int getSize() {
+        return M68kPsiImplUtil.getSize(this);
+    }
+
 }
diff --git a/src/main/java/de/platon42/intellij/plugins/m68k/asm/M68kIsa.kt b/src/main/java/de/platon42/intellij/plugins/m68k/asm/M68kIsa.kt
index dd5c322..7efd1e4 100644
--- a/src/main/java/de/platon42/intellij/plugins/m68k/asm/M68kIsa.kt
+++ b/src/main/java/de/platon42/intellij/plugins/m68k/asm/M68kIsa.kt
@@ -9,6 +9,39 @@ enum class Machine {
     MC68060
 }
 
+enum class AddressMode {
+    IMMEDIATE_DATA,
+    ADDRESS_REGISTER_INDIRECT_PRE_DEC,
+    ADDRESS_REGISTER_INDIRECT_POST_INC,
+    ADDRESS_REGISTER_INDIRECT,
+    ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+    PROGRAM_COUNTER_INDIRECT_WITH_DISPLACEMENT,
+    ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+    PROGRAM_COUNTER_INDIRECT_WITH_INDEX,
+    SPECIAL_REGISTER_DIRECT,
+    DATA_REGISTER_DIRECT,
+    ADDRESS_REGISTER_DIRECT,
+    REGISTER_LIST,
+    ABSOLUTE_ADDRESS
+}
+
+const val OP_UNSIZED = 0
+const val OP_SIZE_B = 1
+const val OP_SIZE_W = 2
+const val OP_SIZE_L = 4
+const val OP_SIZE_S = 8
+
+const val OP_SIZE_BWL = (OP_SIZE_B or OP_SIZE_W or OP_SIZE_L)
+const val OP_SIZE_WL = (OP_SIZE_W or OP_SIZE_L)
+const val OP_SIZE_SBW = (OP_SIZE_B or OP_SIZE_S or OP_SIZE_W)
+
+data class AllowedAdrMode(
+    val op1: Set<AddressMode>? = null,
+    val op2: Set<AddressMode>? = null,
+    val size: Int = OP_SIZE_BWL,
+    val specialReg: String? = null
+)
+
 data class IsaData(
     val mnemonic: String,
     val description: String,
@@ -16,141 +49,502 @@ data class IsaData(
     val altMnemonics: List<String> = emptyList(),
     val conditionCodes: List<String> = emptyList(),
     val id: String = mnemonic,
-    val opSize: String = "bWl",
     val isPrivileged: Boolean = false,
-    val hasOps: Boolean = true
+    val hasOps: Boolean = true,
+    val modes: List<AllowedAdrMode> = listOf(AllowedAdrMode())
 )
 
 object M68kIsa {
-    val conditionCodes =
-        listOf("cc", "ls", "cs", "lt", "eq", "mi", "f", "ne", "ge", "pl", "gt", "t", "hi", "vc", "le", "vs")
-    val conditionCodesBcc = conditionCodes.filterNot { it == "f" || it == "t" }
 
-    val isaData = listOf(
+    private val NO_OPS_UNSIZED = listOf(AllowedAdrMode(size = OP_UNSIZED))
+
+    private val ALL_68000_MODES = setOf(
+        AddressMode.DATA_REGISTER_DIRECT,
+        AddressMode.ADDRESS_REGISTER_DIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+        AddressMode.ABSOLUTE_ADDRESS,
+        AddressMode.IMMEDIATE_DATA,
+        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_DISPLACEMENT,
+        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_INDEX,
+    )
+
+    private val ALL_EXCEPT_IMMEDIATE_AND_PC_REL = setOf(
+        AddressMode.DATA_REGISTER_DIRECT,
+        AddressMode.ADDRESS_REGISTER_DIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+        AddressMode.ABSOLUTE_ADDRESS
+    )
+
+    private val ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL = setOf(
+        AddressMode.DATA_REGISTER_DIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+        AddressMode.ABSOLUTE_ADDRESS
+    )
+
+    private val ALL_EXCEPT_AREG_AND_IMMEDIATE = setOf(
+        AddressMode.DATA_REGISTER_DIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+        AddressMode.ABSOLUTE_ADDRESS,
+        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_DISPLACEMENT,
+        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_INDEX,
+    )
+
+    private val ALL_EXCEPT_AREG = setOf(
+        AddressMode.DATA_REGISTER_DIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+        AddressMode.ABSOLUTE_ADDRESS,
+        AddressMode.IMMEDIATE_DATA,
+        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_DISPLACEMENT,
+        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_INDEX,
+    )
+
+    private val INDIRECT_MODES = setOf(
+        AddressMode.ADDRESS_REGISTER_INDIRECT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+        AddressMode.ABSOLUTE_ADDRESS
+    )
+
+    private val AREG_ONLY = setOf(AddressMode.ADDRESS_REGISTER_DIRECT)
+    private val DREG_ONLY = setOf(AddressMode.DATA_REGISTER_DIRECT)
+
+    private val ADD_SUB_MODES = listOf(
+        AllowedAdrMode(ALL_EXCEPT_AREG, setOf(AddressMode.DATA_REGISTER_DIRECT)),
+        AllowedAdrMode(setOf(AddressMode.ADDRESS_REGISTER_DIRECT), setOf(AddressMode.DATA_REGISTER_DIRECT), OP_SIZE_WL),
+        AllowedAdrMode(setOf(AddressMode.DATA_REGISTER_DIRECT), INDIRECT_MODES),
+    )
+
+    private val ASD_LSD_ROD_ROXD_MODES = listOf(
+        AllowedAdrMode(DREG_ONLY, DREG_ONLY),
+        AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), DREG_ONLY),
+        AllowedAdrMode(INDIRECT_MODES, null),
+    )
+
+    private val BTST_BCHG_BCLR_BSET_MODES = listOf(
+        AllowedAdrMode(DREG_ONLY, ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL, OP_SIZE_L),
+        AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), DREG_ONLY, OP_SIZE_L),
+        AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), INDIRECT_MODES, OP_SIZE_B),
+    )
+
+    private val conditionCodes =
+        listOf("cc", "ls", "cs", "lt", "eq", "mi", "f", "ne", "ge", "pl", "gt", "t", "hi", "vc", "le", "vs")
+
+    private val conditionCodesBcc = conditionCodes.filterNot { it == "f" || it == "t" }
+
+    private val isaData = listOf(
 
         // Data Movement Instructions
-        IsaData("move", "Move"),
-        IsaData("movea", "Move Address", altMnemonics = listOf("move"), opSize = "L"),
-        IsaData("movem", "Move Multiple Registers", opSize = "Wl"),
-        IsaData("movep", "Move Peripheral", opSize = ""),
-        IsaData("moveq", "Move Quick", opSize = "L"),
+        IsaData(
+            "move", "Move",
+            modes = listOf(AllowedAdrMode(ALL_68000_MODES, ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL))
+        ),
+        IsaData(
+            "movea", "Move Address", altMnemonics = listOf("move"),
+            modes = listOf(AllowedAdrMode(ALL_68000_MODES, AREG_ONLY, OP_SIZE_WL))
+        ),
+        IsaData(
+            "movem", "Move Multiple Registers",
+            modes = listOf(
+                AllowedAdrMode(
+                    setOf(AddressMode.REGISTER_LIST),
+                    setOf(
+                        AddressMode.ADDRESS_REGISTER_INDIRECT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+                        AddressMode.ABSOLUTE_ADDRESS
+                    ),
+                    OP_SIZE_WL
+                ),
+                AllowedAdrMode(
+                    setOf(
+                        AddressMode.ADDRESS_REGISTER_INDIRECT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+                        AddressMode.ABSOLUTE_ADDRESS
+                    ),
+                    setOf(AddressMode.REGISTER_LIST),
+                    OP_SIZE_WL
+                ),
+                // according to Yann, specifying the registers as bitmask is also valid
+                AllowedAdrMode(
+                    setOf(AddressMode.IMMEDIATE_DATA),
+                    setOf(
+                        AddressMode.ADDRESS_REGISTER_INDIRECT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+                        AddressMode.ABSOLUTE_ADDRESS
+                    ),
+                    OP_SIZE_WL
+                ),
+                AllowedAdrMode(
+                    setOf(
+                        AddressMode.ADDRESS_REGISTER_INDIRECT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+                        AddressMode.ABSOLUTE_ADDRESS
+                    ),
+                    setOf(AddressMode.IMMEDIATE_DATA),
+                    OP_SIZE_WL
+                ),
+            )
+        ),
+        IsaData(
+            "movep", "Move Peripheral",
+            modes = listOf(
+                AllowedAdrMode(
+                    DREG_ONLY,
+                    setOf(AddressMode.ADDRESS_REGISTER_INDIRECT, AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT),
+                    OP_SIZE_WL
+                ),
+                AllowedAdrMode(
+                    setOf(AddressMode.ADDRESS_REGISTER_INDIRECT, AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT),
+                    DREG_ONLY,
+                    OP_SIZE_WL
+                )
+            )
+        ),
 
-        IsaData("exg", "Exchange Registers", opSize = "L"),
-        IsaData("lea", "Load Effective Address", opSize = ""),
-        IsaData("pea", "Push Effective Address", opSize = ""),
-        IsaData("link", "Link and Allocate", opSize = ""),
-        IsaData("unlk", "Unlink", opSize = ""),
+        IsaData(
+            "moveq", "Move Quick",
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), DREG_ONLY, OP_SIZE_L))
+        ),
+
+        IsaData(
+            "exg", "Exchange Registers",
+            modes = listOf(
+                AllowedAdrMode(
+                    setOf(AddressMode.DATA_REGISTER_DIRECT, AddressMode.ADDRESS_REGISTER_DIRECT),
+                    setOf(AddressMode.DATA_REGISTER_DIRECT, AddressMode.ADDRESS_REGISTER_DIRECT),
+                    OP_SIZE_L
+                )
+            )
+        ),
+        IsaData(
+            "lea", "Load Effective Address",
+            modes = listOf(
+                AllowedAdrMode(
+                    setOf(
+                        AddressMode.ADDRESS_REGISTER_INDIRECT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+                        AddressMode.ABSOLUTE_ADDRESS,
+                        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_INDEX,
+                    ),
+                    AREG_ONLY,
+                    OP_SIZE_L
+                )
+            )
+        ),
+        IsaData(
+            "pea", "Push Effective Address",
+            modes = listOf(
+                AllowedAdrMode(
+                    setOf(
+                        AddressMode.ADDRESS_REGISTER_INDIRECT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+                        AddressMode.ABSOLUTE_ADDRESS,
+                        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_INDEX,
+                    ),
+                    null,
+                    OP_SIZE_L
+                )
+            )
+        ),
+        IsaData(
+            "link", "Link and Allocate",
+            modes = listOf(AllowedAdrMode(AREG_ONLY, setOf(AddressMode.IMMEDIATE_DATA), OP_SIZE_W))
+        ),
+        IsaData(
+            "unlk", "Unlink",
+            modes = listOf(AllowedAdrMode(AREG_ONLY, null, OP_UNSIZED))
+        ),
 
         // Integer Arithmetic Instructions
-        IsaData("add", "Add"),
-        IsaData("adda", "Add Address", altMnemonics = listOf("add"), opSize = "Wl"),
-        IsaData("addi", "Add Immediate", altMnemonics = listOf("add")),
-        IsaData("addq", "Add Quick"),
-        IsaData("addx", "Add with Extend"),
+        IsaData("add", "Add", modes = ADD_SUB_MODES),
+        IsaData("adda", "Add Address", altMnemonics = listOf("add"), modes = listOf(AllowedAdrMode(ALL_68000_MODES, AREG_ONLY, OP_SIZE_WL))),
+        IsaData(
+            "addi", "Add Immediate", altMnemonics = listOf("add"),
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL))
+        ),
+        IsaData(
+            "addq", "Add Quick", modes = listOf(
+                AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL),
+                AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), AREG_ONLY, size = OP_SIZE_WL)
+            )
+        ),
+        IsaData(
+            "addx", "Add with Extend",
+            modes = listOf(
+                AllowedAdrMode(DREG_ONLY, DREG_ONLY),
+                AllowedAdrMode(setOf(AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC), setOf(AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC))
+            )
+        ),
 
-        IsaData("sub", "Subtract"),
-        IsaData("suba", "Subtract Address", altMnemonics = listOf("sub")),
-        IsaData("subi", "Subtract Immediate", altMnemonics = listOf("sub")),
-        IsaData("subq", "Subtract Quick"),
-        IsaData("subx", "Subtract with Extend"),
+        IsaData("sub", "Subtract", modes = ADD_SUB_MODES),
+        IsaData("suba", "Subtract Address", altMnemonics = listOf("sub"), modes = listOf(AllowedAdrMode(ALL_68000_MODES, AREG_ONLY, OP_SIZE_WL))),
+        IsaData(
+            "subi", "Subtract Immediate", altMnemonics = listOf("sub"),
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL))
+        ),
+        IsaData(
+            "subq", "Subtract Quick", modes = listOf(
+                AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL),
+                AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), AREG_ONLY, size = OP_SIZE_WL)
+            )
+        ),
+        IsaData(
+            "subx", "Subtract with Extend",
+            modes = listOf(
+                AllowedAdrMode(DREG_ONLY, DREG_ONLY),
+                AllowedAdrMode(setOf(AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC), setOf(AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC))
+            )
+        ),
 
-        IsaData("neg", "Negate"),
-        IsaData("negx", "Negate with Extend"),
+        IsaData("neg", "Negate", modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL, null))),
+        IsaData("negx", "Negate with Extend", modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL, null))),
 
-        IsaData("clr", "Clear"),
+        IsaData("clr", "Clear", modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL, null))),
 
-        IsaData("cmp", "Compare"),
-        IsaData("cmpa", "Compare Address", altMnemonics = listOf("cmp"), opSize = "Wl"),
-        IsaData("cmpi", "Compare Immediate", altMnemonics = listOf("cmp")),
-        IsaData("cmpm", "Compare Memory to Memory", altMnemonics = listOf("cmp")),
+        IsaData(
+            "cmp", "Compare", modes = listOf(
+                AllowedAdrMode(ALL_EXCEPT_AREG, setOf(AddressMode.DATA_REGISTER_DIRECT)),
+                AllowedAdrMode(setOf(AddressMode.ADDRESS_REGISTER_DIRECT), setOf(AddressMode.DATA_REGISTER_DIRECT), OP_SIZE_WL),
+            )
+        ),
+        IsaData("cmpa", "Compare Address", altMnemonics = listOf("cmp"), modes = listOf(AllowedAdrMode(ALL_68000_MODES, AREG_ONLY, OP_SIZE_WL))),
+        IsaData(
+            "cmpi", "Compare Immediate", altMnemonics = listOf("cmp"),
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), ALL_EXCEPT_AREG_AND_IMMEDIATE))
+        ),
+        IsaData(
+            "cmpm", "Compare Memory to Memory", altMnemonics = listOf("cmp"),
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC), setOf(AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC)))
+        ),
 
-        IsaData("muls", "Signed Multiply", opSize = "W"),
-        IsaData("mulu", "Unsigned Multiply", opSize = "W"),
-        IsaData("divs", "Signed Divide", opSize = "W"),
-        IsaData("divu", "Unsigned Divide", opSize = "W"),
+        IsaData("muls", "Signed Multiply", modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG, DREG_ONLY, OP_SIZE_W))),
+        IsaData("mulu", "Unsigned Multiply", modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG, DREG_ONLY, OP_SIZE_W))),
+        IsaData("divs", "Signed Divide", modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG, DREG_ONLY, OP_SIZE_W))),
+        IsaData("divu", "Unsigned Divide", modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG, DREG_ONLY, OP_SIZE_W))),
 
-        IsaData("ext", "Sign Extend", opSize = "Wl"),
+        IsaData("ext", "Sign Extend", modes = listOf(AllowedAdrMode(DREG_ONLY, null, OP_SIZE_WL))),
 
         // Logical Instructions
-        IsaData("and", "Logical AND"),
-        IsaData("andi", "Logical AND Immediate", altMnemonics = listOf("and")),
-        IsaData("eor", "Logical Exclusive-OR"),
-        IsaData("eori", "Logical Exclusive-OR Immediate", altMnemonics = listOf("eor")),
-        IsaData("not", "Logical Complement"),
-        IsaData("or", "Logical Inclusive-OR"),
-        IsaData("ori", "Logical Inclusive-OR Immediate", altMnemonics = listOf("or")),
+        IsaData(
+            "and", "Logical AND",
+            modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG, DREG_ONLY), AllowedAdrMode(DREG_ONLY, INDIRECT_MODES))
+        ),
+        IsaData(
+            "andi", "Logical AND Immediate", altMnemonics = listOf("and"),
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL))
+        ),
+        IsaData(
+            "eor", "Logical Exclusive-OR",
+            modes = listOf(AllowedAdrMode(DREG_ONLY, ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL))
+        ),
+        IsaData(
+            "eori", "Logical Exclusive-OR Immediate", altMnemonics = listOf("eor"),
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL))
+        ),
+        IsaData(
+            "or", "Logical Inclusive-OR",
+            modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG, DREG_ONLY), AllowedAdrMode(DREG_ONLY, INDIRECT_MODES))
+        ),
+        IsaData(
+            "ori", "Logical Inclusive-OR Immediate", altMnemonics = listOf("or"),
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL))
+        ),
+        IsaData(
+            "not", "Logical Complement",
+            modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL, null))
+        ),
 
         // Shift and Rotate Instructions
-        IsaData("asl", "Arithmetic Shift Left"),
-        IsaData("asr", "Arithmetic Shift Right"),
-        IsaData("lsl", "Logical Shift Left"),
-        IsaData("lsr", "Logical Shift Right"),
-        IsaData("rol", "Rotate Left"),
-        IsaData("ror", "Rotate Right"),
-        IsaData("roxl", "Rotate with Extend Left"),
-        IsaData("roxr", "Rotate with Extend Right"),
-        IsaData("swap", "Swap Register Words", opSize = ""),
+        IsaData("asl", "Arithmetic Shift Left", modes = ASD_LSD_ROD_ROXD_MODES),
+        IsaData("asr", "Arithmetic Shift Right", modes = ASD_LSD_ROD_ROXD_MODES),
+        IsaData("lsl", "Logical Shift Left", modes = ASD_LSD_ROD_ROXD_MODES),
+        IsaData("lsr", "Logical Shift Right", modes = ASD_LSD_ROD_ROXD_MODES),
+        IsaData("rol", "Rotate Left", modes = ASD_LSD_ROD_ROXD_MODES),
+        IsaData("ror", "Rotate Right", modes = ASD_LSD_ROD_ROXD_MODES),
+        IsaData("roxl", "Rotate with Extend Left", modes = ASD_LSD_ROD_ROXD_MODES),
+        IsaData("roxr", "Rotate with Extend Right", modes = ASD_LSD_ROD_ROXD_MODES),
+        IsaData("swap", "Swap Register Words", modes = listOf(AllowedAdrMode(DREG_ONLY, null, OP_SIZE_W))),
 
         // Bit Manipulation Instructions
-        IsaData("bchg", "Test Bit and Change", opSize = "Bl"),
-        IsaData("bclr", "Test Bit and Clear", opSize = "Bl"),
-        IsaData("bset", "Test Bit and Set", opSize = "Bl"),
-        IsaData("btst", "Test Bit", opSize = "Bl"),
+        IsaData("bchg", "Test Bit and Change", modes = BTST_BCHG_BCLR_BSET_MODES),
+        IsaData("bclr", "Test Bit and Clear", modes = BTST_BCHG_BCLR_BSET_MODES),
+        IsaData("bset", "Test Bit and Set", modes = BTST_BCHG_BCLR_BSET_MODES),
+        IsaData("btst", "Test Bit", modes = BTST_BCHG_BCLR_BSET_MODES),
 
         // Binary-Coded Decimal Instructions
-        IsaData("abcd", "Add Decimal with Extend", opSize = ""),
-        IsaData("sbcd", "Subtract Decimal with Extend", opSize = ""),
-        IsaData("nbcd", "Negate Decimal with Extend", opSize = ""),
+        IsaData(
+            "abcd", "Add Decimal with Extend",
+            modes = listOf(
+                AllowedAdrMode(DREG_ONLY, DREG_ONLY, OP_SIZE_B),
+                AllowedAdrMode(setOf(AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC), setOf(AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC), OP_SIZE_B)
+            )
+        ),
+        IsaData(
+            "sbcd", "Subtract Decimal with Extend",
+            modes = listOf(
+                AllowedAdrMode(DREG_ONLY, DREG_ONLY, OP_SIZE_B),
+                AllowedAdrMode(setOf(AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC), setOf(AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC), OP_SIZE_B)
+            )
+        ),
+        IsaData(
+            "nbcd", "Negate Decimal with Extend",
+            modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL, null, OP_SIZE_B))
+        ),
 
         // Program Control Instructions
-        IsaData("bCC", "Branch Conditionally", conditionCodes = conditionCodesBcc, opSize = "bsW"),
-        IsaData("bra", "Branch", opSize = "bsW"),
-        IsaData("bsr", "Branch to Subroutine", opSize = "bsW"),
+        IsaData(
+            "bCC", "Branch Conditionally", conditionCodes = conditionCodesBcc,
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.ABSOLUTE_ADDRESS), null, OP_SIZE_SBW))
+        ),
+        IsaData("bra", "Branch", modes = listOf(AllowedAdrMode(setOf(AddressMode.ABSOLUTE_ADDRESS), null, OP_SIZE_SBW))),
+        IsaData("bsr", "Branch to Subroutine", modes = listOf(AllowedAdrMode(setOf(AddressMode.ABSOLUTE_ADDRESS), null, OP_SIZE_SBW))),
 
         IsaData(
             "dbCC",
             "Test Condition, Decrement, and Branch",
             altMnemonics = listOf("dbra"),
-            conditionCodes = conditionCodes, opSize = "W"
+            conditionCodes = conditionCodes,
+            modes = listOf(AllowedAdrMode(DREG_ONLY, setOf(AddressMode.ABSOLUTE_ADDRESS), OP_SIZE_W))
+        ),
+        IsaData(
+            "sCC", "Set Conditionally", conditionCodes = conditionCodes,
+            modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL, null, OP_SIZE_B))
         ),
-        IsaData("sCC", "Set Conditionally", conditionCodes = conditionCodes, opSize = ""),
 
-        IsaData("jmp", "Jump", opSize = ""),
-        IsaData("jsr", "Jump to Subroutine", opSize = ""),
-        IsaData("nop", "No Operation", opSize = "", hasOps = false),
+        IsaData(
+            "jmp", "Jump",
+            modes = listOf(
+                AllowedAdrMode(
+                    setOf(
+                        AddressMode.ADDRESS_REGISTER_INDIRECT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+                        AddressMode.ABSOLUTE_ADDRESS,
+                        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_INDEX
+                    ), null, OP_UNSIZED
+                )
+            )
+        ),
+        IsaData(
+            "jsr", "Jump to Subroutine",
+            modes = listOf(
+                AllowedAdrMode(
+                    setOf(
+                        AddressMode.ADDRESS_REGISTER_INDIRECT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX,
+                        AddressMode.ABSOLUTE_ADDRESS,
+                        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_DISPLACEMENT,
+                        AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_INDEX
+                    ), null, OP_UNSIZED
+                )
+            )
+        ),
+        IsaData("nop", "No Operation", hasOps = false, modes = NO_OPS_UNSIZED),
 
-        IsaData("rtr", "Return and Restore", hasOps = false),
-        IsaData("rts", "Return from Subroutine", hasOps = false),
+        IsaData("rtr", "Return and Restore", hasOps = false, modes = NO_OPS_UNSIZED),
+        IsaData("rts", "Return from Subroutine", hasOps = false, modes = NO_OPS_UNSIZED),
 
-        IsaData("tst", "Test Operand"),
+        IsaData("tst", "Test Operand", modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL, null))),
 
         // System Control Instructions
-        IsaData("andi", "AND Immediate to Status Register", id = "andi to SR", altMnemonics = listOf("and"), isPrivileged = true),
-        IsaData("eori", "Exclusive-OR Immediate to Status Register", id = "eori to SR", altMnemonics = listOf("eor"), isPrivileged = true),
-        IsaData("ori", "Inclusive-OR Immediate to Status Register", id = "ori to SR", altMnemonics = listOf("or"), isPrivileged = true),
-        IsaData("move", "Move from Status Register", id = "move from SR"),
-        IsaData("move", "Move to Status Register", id = "move to SR", isPrivileged = true),
-        IsaData("move", "Move User Stack Pointer", id = "move USP", isPrivileged = true),
+        IsaData(
+            "andi", "AND Immediate to Status Register", id = "andi to SR", altMnemonics = listOf("and"), isPrivileged = true,
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), setOf(AddressMode.SPECIAL_REGISTER_DIRECT), OP_SIZE_W, "sr"))
+        ),
+        IsaData(
+            "eori", "Exclusive-OR Immediate to Status Register", id = "eori to SR", altMnemonics = listOf("eor"), isPrivileged = true,
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), setOf(AddressMode.SPECIAL_REGISTER_DIRECT), OP_SIZE_W, "sr"))
+        ),
+        IsaData(
+            "ori", "Inclusive-OR Immediate to Status Register", id = "ori to SR", altMnemonics = listOf("or"), isPrivileged = true,
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), setOf(AddressMode.SPECIAL_REGISTER_DIRECT), OP_SIZE_W, "sr"))
+        ),
+        IsaData(
+            "move", "Move from Status Register", id = "move from SR",
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.SPECIAL_REGISTER_DIRECT), ALL_EXCEPT_AREG_IMMEDIATE_AND_PC_REL, OP_SIZE_W, "sr"))
+        ),
+        IsaData(
+            "move", "Move to Status Register", id = "move to SR", isPrivileged = true,
+            modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG, setOf(AddressMode.SPECIAL_REGISTER_DIRECT), OP_SIZE_W, "sr"))
+        ),
+        IsaData(
+            "move", "Move User Stack Pointer", id = "move USP", isPrivileged = true,
+            modes = listOf(
+                AllowedAdrMode(setOf(AddressMode.SPECIAL_REGISTER_DIRECT), AREG_ONLY, OP_SIZE_L, "usp"),
+                AllowedAdrMode(AREG_ONLY, setOf(AddressMode.SPECIAL_REGISTER_DIRECT), OP_SIZE_L, "usp"),
+            )
+        ),
 
-        IsaData("reset", "Reset External Devices", opSize = "", isPrivileged = true, hasOps = false),
-        IsaData("rte", "Return from Exception", isPrivileged = true, hasOps = false),
-        IsaData("stop", "Stop", opSize = "", isPrivileged = true),
+        IsaData("reset", "Reset External Devices", isPrivileged = true, hasOps = false, modes = NO_OPS_UNSIZED),
+        IsaData("rte", "Return from Exception", isPrivileged = true, hasOps = false, modes = NO_OPS_UNSIZED),
+        IsaData(
+            "stop", "Stop", isPrivileged = true,
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), null, OP_UNSIZED))
+        ),
 
-        IsaData("chk", "Check Register Against Bound"),
-        IsaData("illegal", "Take Illegal Instruction Trap", opSize = "", hasOps = false),
-        IsaData("trap", "Trap", opSize = ""),
-        IsaData("trapv", "Trap on Overflow", opSize = ""),
-
-        IsaData("andi", "AND Immediate to Condition Code Register", id = "andi to CCR", altMnemonics = listOf("and")),
-        IsaData("eori", "Exclusive-OR Immediate to Condition Code Register", id = "eori to CCR", altMnemonics = listOf("eor")),
-        IsaData("ori", "Inclusive-OR Immediate to Condition Code Register", id = "ori to CCR", altMnemonics = listOf("or")),
-        IsaData("move", "Move to Condition Code Register", id = "move to CCR"),
+        IsaData(
+            "chk", "Check Register Against Bound",
+            modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG, DREG_ONLY, OP_SIZE_W))
+        ),
+        IsaData("illegal", "Take Illegal Instruction Trap", hasOps = false, modes = NO_OPS_UNSIZED),
+        IsaData("trap", "Trap", modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), null, OP_UNSIZED))),
+        IsaData("trapv", "Trap on Overflow", hasOps = false, modes = NO_OPS_UNSIZED),
 
+        IsaData(
+            "andi", "AND Immediate to Condition Code Register", id = "andi to CCR", altMnemonics = listOf("and"),
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), setOf(AddressMode.SPECIAL_REGISTER_DIRECT), OP_SIZE_W, "ccr"))
+        ),
+        IsaData(
+            "eori", "Exclusive-OR Immediate to Condition Code Register", id = "eori to CCR", altMnemonics = listOf("eor"),
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), setOf(AddressMode.SPECIAL_REGISTER_DIRECT), OP_SIZE_W, "ccr"))
+        ),
+        IsaData(
+            "ori", "Inclusive-OR Immediate to Condition Code Register", id = "ori to CCR", altMnemonics = listOf("or"),
+            modes = listOf(AllowedAdrMode(setOf(AddressMode.IMMEDIATE_DATA), setOf(AddressMode.SPECIAL_REGISTER_DIRECT), OP_SIZE_W, "ccr"))
+        ),
+        IsaData(
+            "move", "Move to Condition Code Register", id = "move to CCR",
+            modes = listOf(AllowedAdrMode(ALL_EXCEPT_AREG, setOf(AddressMode.SPECIAL_REGISTER_DIRECT), OP_SIZE_W, "ccr"))
+        ),
 
         // Multiprocessor Instructions
-        IsaData("tas", "Test Operand and Set", opSize = "B"),
-
-        )
+        IsaData("tas", "Test Operand and Set", modes = listOf(AllowedAdrMode(ALL_EXCEPT_IMMEDIATE_AND_PC_REL, null, OP_SIZE_B)))
+    )
 
     val mnemonics =
         isaData.asSequence()
@@ -161,4 +555,47 @@ object M68kIsa {
                     })
             }
             .toSet()
+
+    fun findMatchingInstruction(mnemonic: String): List<IsaData> {
+        val lowerMnemonic = mnemonic.lowercase()
+        return isaData
+            .filter {
+                if (it.conditionCodes.isEmpty()) {
+                    (it.mnemonic == lowerMnemonic) || it.altMnemonics.any { altMnemonic -> altMnemonic == lowerMnemonic }
+                } else {
+                    it.altMnemonics.any { altMnemonic -> altMnemonic == lowerMnemonic } ||
+                            it.conditionCodes.any { cc ->
+                                it.mnemonic.replace("CC", cc) == lowerMnemonic
+                            }
+                }
+            }
+    }
+
+    fun findMatchingOpMode(candidates: List<IsaData>, op1: AddressMode?, op2: AddressMode?, opSize: Int?, specialReg: String?): List<IsaData> {
+        return candidates.filter {
+            it.modes.any { am ->
+                isAddressModeMatching(am, op1, op2, specialReg)
+                        && ((opSize == null) || ((opSize and am.size) == opSize))
+            }
+        }
+    }
+
+    fun findMatchingOpModeIgnoringSize(candidates: List<IsaData>, op1: AddressMode?, op2: AddressMode?, specialReg: String?): List<IsaData> {
+        return candidates.filter {
+            it.modes.any { am -> isAddressModeMatching(am, op1, op2, specialReg) }
+        }
+    }
+
+    fun findSupportedOpSizes(candidates: List<IsaData>, op1: AddressMode?, op2: AddressMode?, specialReg: String?): Int {
+        return candidates.fold(OP_UNSIZED) { acc, isaData ->
+            acc or isaData.modes.fold(OP_UNSIZED) { am_acc, am ->
+                if (isAddressModeMatching(am, op1, op2, specialReg)) am_acc or am.size else am_acc
+            }
+        }
+    }
+
+    private fun isAddressModeMatching(am: AllowedAdrMode, op1: AddressMode?, op2: AddressMode?, specialReg: String?) =
+        ((((op1 == null) && (am.op1 == null)) || am.op1?.contains(op1) ?: false)
+                && (((op2 == null) && (am.op2 == null)) || am.op2?.contains(op2) ?: false)
+                && ((specialReg == null) || (specialReg == am.specialReg)))
 }
\ No newline at end of file
diff --git a/src/main/java/de/platon42/intellij/plugins/m68k/inspections/AbstractBaseM68kLocalInspectionTool.kt b/src/main/java/de/platon42/intellij/plugins/m68k/inspections/AbstractBaseM68kLocalInspectionTool.kt
new file mode 100644
index 0000000..98ef2a3
--- /dev/null
+++ b/src/main/java/de/platon42/intellij/plugins/m68k/inspections/AbstractBaseM68kLocalInspectionTool.kt
@@ -0,0 +1,44 @@
+package de.platon42.intellij.plugins.m68k.inspections
+
+import com.intellij.codeInspection.InspectionManager
+import com.intellij.codeInspection.LocalInspectionTool
+import com.intellij.codeInspection.ProblemDescriptor
+import com.intellij.codeInspection.ProblemsHolder
+import com.intellij.psi.PsiElementVisitor
+import de.platon42.intellij.plugins.m68k.psi.*
+
+abstract class AbstractBaseM68kLocalInspectionTool : LocalInspectionTool() {
+
+    protected open fun checkStatement(statement: M68kStatement, manager: InspectionManager, isOnTheFly: Boolean): Array<ProblemDescriptor>? = null
+
+    protected open fun checkAsmInstruction(asmInstruction: M68kAsmInstruction, manager: InspectionManager, isOnTheFly: Boolean): Array<ProblemDescriptor>? =
+        null
+
+    protected open fun checkMacroCall(macroCall: M68kMacroCall, manager: InspectionManager, isOnTheFly: Boolean): Array<ProblemDescriptor>? = null
+
+    protected open fun checkDirective(directive: M68kPreprocessorDirective, manager: InspectionManager, isOnTheFly: Boolean): Array<ProblemDescriptor>? = null
+
+    protected open fun checkRegister(register: M68kRegister, manager: InspectionManager, isOnTheFly: Boolean): Array<ProblemDescriptor>? = null
+
+    override fun getGroupDisplayName() = "M68k"
+
+    override fun buildVisitor(holder: ProblemsHolder, isOnTheFly: Boolean): PsiElementVisitor {
+        return object : M68kVisitor() {
+            override fun visitStatement(statement: M68kStatement) = addDescriptors(checkStatement(statement, holder.manager, isOnTheFly))
+
+            override fun visitAsmInstruction(asmInstruction: M68kAsmInstruction) =
+                addDescriptors(checkAsmInstruction(asmInstruction, holder.manager, isOnTheFly))
+
+            override fun visitMacroCall(macroCall: M68kMacroCall) = addDescriptors(checkMacroCall(macroCall, holder.manager, isOnTheFly))
+
+            override fun visitPreprocessorDirective(directive: M68kPreprocessorDirective) =
+                addDescriptors(checkDirective(directive, holder.manager, isOnTheFly))
+
+            override fun visitRegister(register: M68kRegister) = addDescriptors(checkRegister(register, holder.manager, isOnTheFly))
+
+            private fun addDescriptors(descriptors: Array<ProblemDescriptor>?) {
+                descriptors?.forEach(holder::registerProblem)
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspection.kt b/src/main/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspection.kt
new file mode 100644
index 0000000..7e72f8b
--- /dev/null
+++ b/src/main/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspection.kt
@@ -0,0 +1,193 @@
+package de.platon42.intellij.plugins.m68k.inspections
+
+import com.intellij.codeInspection.InspectionManager
+import com.intellij.codeInspection.LocalQuickFix
+import com.intellij.codeInspection.ProblemDescriptor
+import com.intellij.codeInspection.ProblemHighlightType
+import de.platon42.intellij.plugins.m68k.asm.*
+import de.platon42.intellij.plugins.m68k.asm.M68kIsa.findMatchingInstruction
+import de.platon42.intellij.plugins.m68k.asm.M68kIsa.findMatchingOpMode
+import de.platon42.intellij.plugins.m68k.asm.M68kIsa.findMatchingOpModeIgnoringSize
+import de.platon42.intellij.plugins.m68k.asm.M68kIsa.findSupportedOpSizes
+import de.platon42.intellij.plugins.m68k.psi.M68kAddressModeUtil.getAddressModeForType
+import de.platon42.intellij.plugins.m68k.psi.M68kAsmInstruction
+import de.platon42.intellij.plugins.m68k.psi.M68kSpecialRegisterDirectAddressingMode
+
+class M68kSyntaxInspection : AbstractBaseM68kLocalInspectionTool() {
+
+    companion object {
+        private const val DISPLAY_NAME = "Assembly instruction validity"
+
+        private const val INSTRUCTION_NOT_FOUND_MSG = "Instruction '#ref' not supported on selected cpu"
+        private const val OPERANDS_UNEXPECTED_MSG_TEMPLATE = "No operands expected for '%s'"
+        private const val SECOND_OP_UNEXPECTED_MSG_TEMPLATE = "Second operand '#ref' unexpected for '%s'"
+        private const val UNSUPPORTED_ADDRESSING_MODE_MSG_TEMPLATE = "Unsupported addressing mode for '%s'"
+        private const val UNSUPPORTED_ADDRESSING_MODE_OP1_MSG_TEMPLATE = "Unsupported addressing mode '#ref' for first operand of '%s'"
+        private const val UNSUPPORTED_ADDRESSING_MODE_OP2_MSG_TEMPLATE = "Unsupported addressing mode '#ref' for second operand of '%s'"
+        private const val UNSUPPORTED_ADDRESSING_MODE_FLIP_MSG_TEMPLATE = "Unsupported addressing modes for operands in this order for '%s'"
+        private const val UNSUPPORTED_SIZE_UNSIZED_MSG_TEMPLATE = "Instruction '%s' is unsized"
+        private const val UNSUPPORTED_SIZE_MSG_TEMPLATE = "Operation size '#ref' unsupported for '%s"
+        private const val UNSUPPORTED_SIZE_BYTE_MSG = "Operation size '#ref' unsupported (should be .b)"
+        private const val UNSUPPORTED_SIZE_WORD_MSG = "Operation size '#ref' unsupported (should be .w)"
+        private const val UNSUPPORTED_SIZE_LONG_MSG = "Operation size '#ref' unsupported (should be .l)"
+        private const val UNSUPPORTED_SIZE_WORD_OR_LONG_MSG = "Operation size '#ref' unsupported (should be .w or .l)"
+    }
+
+    override fun getDisplayName() = DISPLAY_NAME
+
+    override fun checkAsmInstruction(asmInstruction: M68kAsmInstruction, manager: InspectionManager, isOnTheFly: Boolean): Array<ProblemDescriptor>? {
+        val asmOp = asmInstruction.asmOp
+        val mnemonicWithSize = asmOp.text
+        val isaData = findMatchingInstruction(asmOp.mnemonic)
+        if (isaData.isEmpty()) {
+            return arrayOf(
+                manager.createProblemDescriptor(
+                    asmOp,
+                    INSTRUCTION_NOT_FOUND_MSG,
+                    null as LocalQuickFix?,
+                    ProblemHighlightType.ERROR,
+                    isOnTheFly
+                )
+            )
+        }
+        if (asmInstruction.addressingModeList.isNotEmpty() && isaData.none { it.hasOps }) {
+            return arrayOf(
+                manager.createProblemDescriptor(
+                    asmInstruction.addressingModeList.first(),
+                    asmInstruction.addressingModeList.last(),
+                    OPERANDS_UNEXPECTED_MSG_TEMPLATE.format(mnemonicWithSize),
+                    ProblemHighlightType.ERROR,
+                    isOnTheFly
+                )
+            )
+        }
+        val op1 = getAddressModeForType(asmInstruction.addressingModeList.getOrNull(0))
+        val op2 = getAddressModeForType(asmInstruction.addressingModeList.getOrNull(1))
+        val specialReg1 = (asmInstruction.addressingModeList.getOrNull(0) as? M68kSpecialRegisterDirectAddressingMode)?.specialRegister?.text
+        val specialReg2 = (asmInstruction.addressingModeList.getOrNull(1) as? M68kSpecialRegisterDirectAddressingMode)?.specialRegister?.text
+        val opSize = asmOp.opSize
+        val matchingModeIsaData = findMatchingOpMode(isaData, op1, op2, opSize, specialReg1 ?: specialReg2)
+        if (matchingModeIsaData.isEmpty()) {
+            val matchingModeIsaDataIgnoringSize = findMatchingOpModeIgnoringSize(isaData, op1, op2, specialReg1 ?: specialReg2)
+            if (matchingModeIsaDataIgnoringSize.isEmpty()) {
+                val matchingModeIsaDataSwapped = findMatchingOpModeIgnoringSize(isaData, op2, op1, specialReg1 ?: specialReg2)
+                val supportedModesOp1 = isaData.flatMap { it.modes.flatMap { am -> am.op1 ?: emptySet() } }.toSet()
+                val supportedModesOp2 = isaData.flatMap { it.modes.flatMap { am -> am.op2 ?: emptySet() } }.toSet()
+
+                if (matchingModeIsaDataSwapped.isNotEmpty()) {
+                    return arrayOf(
+                        manager.createProblemDescriptor(
+                            asmInstruction,
+                            UNSUPPORTED_ADDRESSING_MODE_FLIP_MSG_TEMPLATE.format(mnemonicWithSize),
+                            null as LocalQuickFix?, // TODO add flipping quickfix
+                            ProblemHighlightType.ERROR,
+                            isOnTheFly
+                        )
+                    )
+                }
+
+                if ((op2 != null)) {
+                    if (supportedModesOp2.isEmpty()) {
+                        return arrayOf(
+                            manager.createProblemDescriptor(
+                                asmInstruction.addressingModeList[1],
+                                SECOND_OP_UNEXPECTED_MSG_TEMPLATE.format(mnemonicWithSize),
+                                null as LocalQuickFix?,
+                                ProblemHighlightType.ERROR,
+                                isOnTheFly
+                            )
+                        )
+                    }
+                    if (supportedModesOp1.contains(op1) && !supportedModesOp2.contains(op2)) {
+                        return arrayOf(
+                            manager.createProblemDescriptor(
+                                asmInstruction.addressingModeList[1],
+                                UNSUPPORTED_ADDRESSING_MODE_OP2_MSG_TEMPLATE.format(mnemonicWithSize),
+                                null as LocalQuickFix?,
+                                ProblemHighlightType.ERROR,
+                                isOnTheFly
+                            )
+                        )
+                    }
+                    if (supportedModesOp2.contains(op2) && !supportedModesOp1.contains(op1)) {
+                        return arrayOf(
+                            manager.createProblemDescriptor(
+                                asmInstruction.addressingModeList[0],
+                                UNSUPPORTED_ADDRESSING_MODE_OP1_MSG_TEMPLATE.format(mnemonicWithSize),
+                                null as LocalQuickFix?,
+                                ProblemHighlightType.ERROR,
+                                isOnTheFly
+                            )
+                        )
+                    }
+                }
+                return arrayOf(
+                    manager.createProblemDescriptor(
+                        asmInstruction.addressingModeList.firstOrNull() ?: asmInstruction,
+                        asmInstruction.addressingModeList.lastOrNull() ?: asmInstruction,
+                        UNSUPPORTED_ADDRESSING_MODE_MSG_TEMPLATE.format(mnemonicWithSize),
+                        ProblemHighlightType.ERROR,
+                        isOnTheFly
+                    )
+                )
+            }
+
+
+            val supportedOpSizes = findSupportedOpSizes(matchingModeIsaDataIgnoringSize, op1, op2, specialReg1 ?: specialReg2)
+            return arrayOf(
+                when (supportedOpSizes) {
+                    OP_UNSIZED ->
+                        manager.createProblemDescriptor(
+                            asmOp.operandSize ?: asmOp,
+                            UNSUPPORTED_SIZE_UNSIZED_MSG_TEMPLATE.format(asmOp.mnemonic),
+                            null as LocalQuickFix?, // TODO remove size quickfix?
+                            ProblemHighlightType.ERROR,
+                            isOnTheFly
+                        )
+                    OP_SIZE_B ->
+                        manager.createProblemDescriptor(
+                            asmOp.operandSize ?: asmOp,
+                            UNSUPPORTED_SIZE_BYTE_MSG,
+                            null as LocalQuickFix?, // TODO change size to .b?
+                            ProblemHighlightType.ERROR,
+                            isOnTheFly
+                        )
+                    OP_SIZE_W ->
+                        manager.createProblemDescriptor(
+                            asmOp.operandSize ?: asmOp,
+                            UNSUPPORTED_SIZE_WORD_MSG,
+                            null as LocalQuickFix?, // TODO change size to .w?
+                            ProblemHighlightType.ERROR,
+                            isOnTheFly
+                        )
+                    OP_SIZE_L ->
+                        manager.createProblemDescriptor(
+                            asmOp.operandSize ?: asmOp,
+                            UNSUPPORTED_SIZE_LONG_MSG,
+                            null as LocalQuickFix?, // TODO change size to .l?
+                            ProblemHighlightType.ERROR,
+                            isOnTheFly
+                        )
+                    OP_SIZE_WL ->
+                        manager.createProblemDescriptor(
+                            asmOp.operandSize ?: asmOp,
+                            UNSUPPORTED_SIZE_WORD_OR_LONG_MSG,
+                            null as LocalQuickFix?,
+                            ProblemHighlightType.ERROR,
+                            isOnTheFly
+                        )
+                    else ->
+                        manager.createProblemDescriptor(
+                            asmOp.operandSize ?: asmOp,
+                            UNSUPPORTED_SIZE_MSG_TEMPLATE.format(asmOp.mnemonic),
+                            null as LocalQuickFix?, // TODO remove size quickfix?
+                            ProblemHighlightType.ERROR,
+                            isOnTheFly
+                        )
+
+                }
+            )
+        }
+        return emptyArray()
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/de/platon42/intellij/plugins/m68k/m68k.bnf b/src/main/java/de/platon42/intellij/plugins/m68k/m68k.bnf
index c394839..21bc3e8 100644
--- a/src/main/java/de/platon42/intellij/plugins/m68k/m68k.bnf
+++ b/src/main/java/de/platon42/intellij/plugins/m68k/m68k.bnf
@@ -161,11 +161,17 @@ GlobalLabel ::= GLOBAL_LABEL_DEF COLON* {
 
 private Label ::= LocalLabel | GlobalLabel
 
-OperandSize ::= (OPSIZE_BS|OPSIZE_W|OPSIZE_L) { name = ".s|.b|.w|.l" }
+OperandSize ::= (OPSIZE_BS|OPSIZE_W|OPSIZE_L) {
+    name = ".s|.b|.w|.l"
+    methods = [getSize]
+}
 AddressSize ::= (OPSIZE_W|OPSIZE_L) { name = ".w|.l" }
 DataWidth ::= (OPSIZE_W|OPSIZE_L) { name = ".w|.l" }
 
-AsmOp ::= MNEMONIC OperandSize?
+AsmOp ::= MNEMONIC OperandSize? {
+    name = "mnemonic"
+    methods = [getMnemonic getOpSize]
+}
 
 PreprocessorDirective ::= Label? (DATA_DIRECTIVE | OTHER_DIRECTIVE)
         PreprocessorOperands?
@@ -174,7 +180,7 @@ MacroPlainLine ::= MACRO_LINE
 MacroNameDefinition ::= MACRO_NAME
 
 MacroDefinition ::= ((MacroNameDefinition MACRO_TAG)|(MACRO_TAG MacroNameDefinition)) MacroPlainLine* MACRO_END_TAG {
-pin=1
+    pin = 1
     name = "macro definition"
     implements = "de.platon42.intellij.plugins.m68k.psi.M68kNamedElement"
     mixin = "de.platon42.intellij.plugins.m68k.psi.M68kMacroDefinitionMixin"
diff --git a/src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kAddressModeUtil.kt b/src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kAddressModeUtil.kt
new file mode 100644
index 0000000..93f6c02
--- /dev/null
+++ b/src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kAddressModeUtil.kt
@@ -0,0 +1,29 @@
+package de.platon42.intellij.plugins.m68k.psi
+
+import de.platon42.intellij.plugins.m68k.asm.AddressMode
+
+object M68kAddressModeUtil {
+    fun getAddressModeForType(addressingMode: M68kAddressingMode?): AddressMode? {
+        if (addressingMode == null) return null
+        return when (addressingMode) {
+            is M68kImmediateData -> AddressMode.IMMEDIATE_DATA
+            is M68kAddressRegisterIndirectAddressingMode -> AddressMode.ADDRESS_REGISTER_INDIRECT
+            is M68kAddressRegisterIndirectPostIncAddressingMode -> AddressMode.ADDRESS_REGISTER_INDIRECT_POST_INC
+            is M68kAddressRegisterIndirectPreDecAddressingMode -> AddressMode.ADDRESS_REGISTER_INDIRECT_PRE_DEC
+            is M68kAddressRegisterIndirectWithDisplacementNewAddressingMode -> AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT
+            is M68kAddressRegisterIndirectWithDisplacementOldAddressingMode -> AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_DISPLACEMENT
+            is M68kAddressRegisterIndirectWithIndexNewAddressingMode -> AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX
+            is M68kAddressRegisterIndirectWithIndexOldAddressingMode -> AddressMode.ADDRESS_REGISTER_INDIRECT_WITH_INDEX
+            is M68kProgramCounterIndirectWithDisplacementNewAddressingMode -> AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_DISPLACEMENT
+            is M68kProgramCounterIndirectWithDisplacementOldAddressingMode -> AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_DISPLACEMENT
+            is M68kProgramCounterIndirectWithIndexNewAddressingMode -> AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_INDEX
+            is M68kProgramCounterIndirectWithIndexOldAddressingMode -> AddressMode.PROGRAM_COUNTER_INDIRECT_WITH_INDEX
+            is M68kSpecialRegisterDirectAddressingMode -> AddressMode.SPECIAL_REGISTER_DIRECT
+            is M68kDataRegisterDirectAddressingMode -> AddressMode.DATA_REGISTER_DIRECT
+            is M68kAddressRegisterDirectAddressingMode -> AddressMode.ADDRESS_REGISTER_DIRECT
+            is M68kRegisterListAddressingMode -> AddressMode.REGISTER_LIST
+            is M68kAbsoluteAddressAddressingMode -> AddressMode.ABSOLUTE_ADDRESS
+            else -> throw IllegalArgumentException("Unknown addressing mode $addressingMode")
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kPsiImplUtil.kt b/src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kPsiImplUtil.kt
index b754ad4..a092405 100644
--- a/src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kPsiImplUtil.kt
+++ b/src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kPsiImplUtil.kt
@@ -2,6 +2,7 @@ package de.platon42.intellij.plugins.m68k.psi
 
 import com.intellij.psi.PsiElement
 import com.intellij.util.IncorrectOperationException
+import de.platon42.intellij.plugins.m68k.asm.*
 import de.platon42.intellij.plugins.m68k.psi.M68kElementFactory.createGlobalLabel
 import de.platon42.intellij.plugins.m68k.psi.M68kElementFactory.createLocalLabel
 import de.platon42.intellij.plugins.m68k.psi.M68kElementFactory.createMacroDefinition
@@ -94,4 +95,22 @@ object M68kPsiImplUtil {
     @JvmStatic
     fun getMacroName(element: M68kMacroCall): String = element.firstChild.text
 
-}
\ No newline at end of file
+    // AsmOp
+    @JvmStatic
+    fun getMnemonic(element: M68kAsmOp): String = element.firstChild.text
+
+    @JvmStatic
+    fun getOpSize(element: M68kAsmOp): Int = element.operandSize?.size ?: OP_UNSIZED
+
+    // OperandSize
+    @JvmStatic
+    fun getSize(element: M68kOperandSize): Int =
+        when (element.text) {
+            null -> OP_UNSIZED
+            ".w" -> OP_SIZE_W
+            ".l" -> OP_SIZE_L
+            ".b" -> OP_SIZE_B
+            ".s" -> OP_SIZE_S
+            else -> throw IllegalArgumentException("Unknown op size ${element.text}")
+        }
+}
diff --git a/src/main/resources/META-INF/plugin.xml b/src/main/resources/META-INF/plugin.xml
index 21d02f6..d743475 100644
--- a/src/main/resources/META-INF/plugin.xml
+++ b/src/main/resources/META-INF/plugin.xml
@@ -40,6 +40,9 @@
         <psi.referenceContributor implementation="de.platon42.intellij.plugins.m68k.refs.M68kReferenceContributor"/>
         <gotoSymbolContributor implementation="de.platon42.intellij.plugins.m68k.refs.M68kChooseByNameContributor"/>
         <renameInputValidator implementation="de.platon42.intellij.plugins.m68k.psi.M68kRenameInputValidator"/>
+
+        <localInspection implementationClass="de.platon42.intellij.plugins.m68k.inspections.M68kSyntaxInspection"
+                         enabledByDefault="true" level="ERROR"/>
     </extensions>
 
     <actions>
diff --git a/src/main/resources/inspectionDescriptions/M68kSyntax.html b/src/main/resources/inspectionDescriptions/M68kSyntax.html
new file mode 100644
index 0000000..901e3a8
--- /dev/null
+++ b/src/main/resources/inspectionDescriptions/M68kSyntax.html
@@ -0,0 +1,14 @@
+<html>
+<body>
+Reports wrong use of assembler instruction syntax.
+
+The parser allows more combinations than supported by the target CPU.
+This inspection does a strict verification on the allowed addressing modes
+and operation size for each assembly mnemonic.
+<!-- tooltip end -->
+<p>Several different error messages may be the result of this verification,
+    giving hints whether the first or the second addressing mode is unsupported,
+    or if the operands should be swapped to make it a legal instruction.
+</p>
+</body>
+</html>
\ No newline at end of file
diff --git a/src/test/java/de/platon42/intellij/plugins/m68k/inspections/AbstractInspectionTest.kt b/src/test/java/de/platon42/intellij/plugins/m68k/inspections/AbstractInspectionTest.kt
new file mode 100644
index 0000000..74fdda8
--- /dev/null
+++ b/src/test/java/de/platon42/intellij/plugins/m68k/inspections/AbstractInspectionTest.kt
@@ -0,0 +1,18 @@
+package de.platon42.intellij.plugins.m68k.inspections
+
+import com.intellij.testFramework.fixtures.CodeInsightTestFixture
+import de.platon42.intellij.jupiter.LightCodeInsightExtension
+import de.platon42.intellij.jupiter.TestDataPath
+import de.platon42.intellij.plugins.m68k.AbstractM68kTest
+import org.assertj.core.api.Assertions.assertThat
+import org.assertj.core.api.Condition
+import org.junit.jupiter.api.extension.ExtendWith
+
+@ExtendWith(LightCodeInsightExtension::class)
+@TestDataPath("src/test/resources/inspections")
+abstract class AbstractInspectionTest : AbstractM68kTest() {
+    protected fun assertHighlightings(myFixture: CodeInsightTestFixture, count: Int, snippet: String) {
+        assertThat(myFixture.doHighlighting())
+            .areExactly(count, Condition({ it.description?.contains(snippet) ?: false }, "containing"))
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspectionTest.kt b/src/test/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspectionTest.kt
new file mode 100644
index 0000000..52bb715
--- /dev/null
+++ b/src/test/java/de/platon42/intellij/plugins/m68k/inspections/M68kSyntaxInspectionTest.kt
@@ -0,0 +1,99 @@
+package de.platon42.intellij.plugins.m68k.inspections
+
+import com.intellij.testFramework.fixtures.CodeInsightTestFixture
+import de.platon42.intellij.jupiter.MyFixture
+import org.junit.jupiter.api.Test
+
+internal class M68kSyntaxInspectionTest : AbstractInspectionTest() {
+
+    @Test
+    internal fun shows_error_on_instruction_with_unexpected_operands(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " rts d0")
+        assertHighlightings(myFixture, 1, "No operands expected for 'rts'")
+    }
+
+    @Test
+    internal fun shows_error_on_instruction_with_unexpected_second_operand(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " jmp label,d0")
+        assertHighlightings(myFixture, 1, "Second operand 'd0' unexpected")
+    }
+
+    @Test
+    internal fun shows_unsupported_addressing_mode_in_first_operand(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " moveq.l 123,d0")
+        assertHighlightings(myFixture, 1, "Unsupported addressing mode '123' for first operand")
+    }
+
+    @Test
+    internal fun shows_unsupported_addressing_mode_in_second_operand(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " moveq.l #123,a0")
+        assertHighlightings(myFixture, 1, "Unsupported addressing mode 'a0' for second operand")
+    }
+
+    @Test
+    internal fun shows_unsupported_swapped_addressing_mode(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " cmp.l d0,(a0)")
+        assertHighlightings(myFixture, 1, "Unsupported addressing modes for operands in this order for 'cmp.l'")
+    }
+
+    @Test
+    internal fun shows_error_on_unsized_instruction_with_size(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " rts.l")
+        assertHighlightings(myFixture, 1, "Instruction 'rts' is unsized")
+    }
+
+    @Test
+    internal fun shows_error_on_unsupported_op_size_for_b(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " btst.l #5,(a0)")
+        assertHighlightings(myFixture, 1, "Operation size '.l' unsupported (should be .b)")
+    }
+
+    @Test
+    internal fun shows_error_on_unsupported_op_size_for_w(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " divu.b #5,d0")
+        assertHighlightings(myFixture, 1, "Operation size '.b' unsupported (should be .w)")
+    }
+
+    @Test
+    internal fun shows_error_on_unsupported_op_size_for_l(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " moveq.w #5,d0")
+        assertHighlightings(myFixture, 1, "Operation size '.w' unsupported (should be .l)")
+    }
+
+    @Test
+    internal fun shows_error_on_unsupported_op_size_for_w_or_l(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " addq.b #5,a0")
+        assertHighlightings(myFixture, 1, "Operation size '.b' unsupported (should be .w or .l)")
+    }
+
+    @Test
+    internal fun shows_error_on_unsupported_op_size_for_other(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " bsr.l label")
+        assertHighlightings(myFixture, 1, "Operation size '.l' unsupported")
+    }
+
+    @Test
+    internal fun shows_error_wrong_mode_on_instruction_with_special_reg(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " move.l usp,d0")
+        assertHighlightings(myFixture, 1, "Unsupported addressing mode for 'move.l'")
+    }
+
+    @Test
+    internal fun shows_error_wrong_register_on_instruction_with_special_reg(@MyFixture myFixture: CodeInsightTestFixture) {
+        myFixture.enableInspections(M68kSyntaxInspection::class.java)
+        myFixture.configureByText("syntax.asm", " move.l vbr,a0")
+        assertHighlightings(myFixture, 1, "Unsupported addressing mode for 'move.l'")
+    }
+}
\ No newline at end of file