diff --git a/InstructionSets/68k/Decoder.cpp b/InstructionSets/68k/Decoder.cpp
index ba9bdd8d0..db3cd618e 100644
--- a/InstructionSets/68k/Decoder.cpp
+++ b/InstructionSets/68k/Decoder.cpp
@@ -329,6 +329,22 @@ template <uint8_t op, bool validate> Preinstruction Predecoder<model>::validated
 				case AddressingMode::None:
 					return Preinstruction();
 			}
+
+		case OpT(Operation::ASLm):		case OpT(Operation::ASRm):
+		case OpT(Operation::LSLm):		case OpT(Operation::LSRm):
+		case OpT(Operation::ROLm):		case OpT(Operation::RORm):
+		case OpT(Operation::ROXLm):		case OpT(Operation::ROXRm):
+			switch(original.mode<0>()) {
+				default: return original;
+
+				case AddressingMode::DataRegisterDirect:
+				case AddressingMode::AddressRegisterDirect:
+				case AddressingMode::ImmediateData:
+				case AddressingMode::ProgramCounterIndirectWithDisplacement:
+				case AddressingMode::ProgramCounterIndirectWithIndex8bitDisplacement:
+				case AddressingMode::None:
+					return Preinstruction();
+			}
 	}
 }
 
@@ -706,8 +722,8 @@ template <uint8_t op, bool validate> Preinstruction Predecoder<model>::decode(ui
 		case OpT(Operation::ROLb):	case OpT(Operation::ROLw):	case OpT(Operation::ROLl):
 			return validated<op, validate>(
 				Preinstruction(operation,
-					AddressingMode::DataRegisterDirect, ea_register,
-					(instruction & 0x100) ? AddressingMode::DataRegisterDirect : AddressingMode::Quick, data_register));
+					(instruction & 0x20) ? AddressingMode::DataRegisterDirect : AddressingMode::Quick, data_register,
+					AddressingMode::DataRegisterDirect, ea_register));
 
 		//
 		// MARK: ASRm, LSRm, ROXRm, RORm, ASLm, LSLm, ROXLm, ROLm
@@ -1183,6 +1199,19 @@ template <Model model>
 Preinstruction Predecoder<model>::decodeE(uint16_t instruction) {
 	using Op = Operation;
 
+	switch(instruction & 0xfc0) {
+		case 0x0c0:	Decode(Op::ASRm);	// 4-22 (p126)
+		case 0x1c0:	Decode(Op::ASLm);	// 4-22 (p126)
+		case 0x2c0:	Decode(Op::LSRm);	// 4-113 (p217)
+		case 0x3c0:	Decode(Op::LSLm);	// 4-113 (p217)
+		case 0x4c0:	Decode(Op::ROXRm);	// 4-163 (p267)
+		case 0x5c0:	Decode(Op::ROXLm);	// 4-163 (p267)
+		case 0x6c0:	Decode(Op::RORm);	// 4-160 (p264)
+		case 0x7c0:	Decode(Op::ROLm);	// 4-160 (p264)
+
+		default:	break;
+	}
+
 	switch(instruction & 0x1d8) {
 		// 4-22 (p126)
 		case 0x000:	Decode(Op::ASRb);
@@ -1227,19 +1256,6 @@ Preinstruction Predecoder<model>::decodeE(uint16_t instruction) {
 		default:	break;
 	}
 
-	switch(instruction & 0xfc0) {
-		case 0x0c0:	Decode(Op::ASRm);	// 4-22 (p126)
-		case 0x1c0:	Decode(Op::ASLm);	// 4-22 (p126)
-		case 0x2c0:	Decode(Op::LSRm);	// 4-113 (p217)
-		case 0x3c0:	Decode(Op::LSLm);	// 4-113 (p217)
-		case 0x4c0:	Decode(Op::ROXRm);	// 4-163 (p267)
-		case 0x5c0:	Decode(Op::ROXLm);	// 4-163 (p267)
-		case 0x6c0:	Decode(Op::RORm);	// 4-160 (p264)
-		case 0x7c0:	Decode(Op::ROLm);	// 4-160 (p264)
-
-		default:	break;
-	}
-
 	return Preinstruction();
 }
 
diff --git a/OSBindings/Mac/Clock SignalTests/m68kDecoderTests.mm b/OSBindings/Mac/Clock SignalTests/m68kDecoderTests.mm
index d1f13593e..bb6cb15ea 100644
--- a/OSBindings/Mac/Clock SignalTests/m68kDecoderTests.mm	
+++ b/OSBindings/Mac/Clock SignalTests/m68kDecoderTests.mm	
@@ -71,6 +71,7 @@ template <int index> NSString *operand(Preinstruction instruction) {
 	XCTAssertNotNil(decodings);
 
 	Predecoder<Model::M68000> decoder;
+	int skipped = 0;
 	for(int instr = 0; instr < 65536; instr++) {
 		NSString *const instrName = [NSString stringWithFormat:@"%04x", instr];
 		NSString *const expected = decodings[instrName];
@@ -180,18 +181,44 @@ template <int index> NSString *operand(Preinstruction instruction) {
 			case Operation::ASLl:	instruction = @"ASL.l";	break;
 			case Operation::ASLm:	instruction = @"ASL.w";	break;
 
+			case Operation::ASRb:	instruction = @"ASR.b";	break;
+			case Operation::ASRw:	instruction = @"ASR.w";	break;
+			case Operation::ASRl:	instruction = @"ASR.l";	break;
+			case Operation::ASRm:	instruction = @"ASR.w";	break;
+
+			case Operation::LSLb:	instruction = @"LSL.b";	break;
+			case Operation::LSLw:	instruction = @"LSL.w";	break;
+			case Operation::LSLl:	instruction = @"LSL.l";	break;
+			case Operation::LSLm:	instruction = @"LSL.w";	break;
+
+			case Operation::LSRb:	instruction = @"LSR.b";	break;
+			case Operation::LSRw:	instruction = @"LSR.w";	break;
+			case Operation::LSRl:	instruction = @"LSR.l";	break;
+			case Operation::LSRm:	instruction = @"LSR.w";	break;
+
+			case Operation::ROLb:	instruction = @"ROL.b";	break;
+			case Operation::ROLw:	instruction = @"ROL.w";	break;
+			case Operation::ROLl:	instruction = @"ROL.l";	break;
+			case Operation::ROLm:	instruction = @"ROL.w";	break;
+
+			case Operation::RORb:	instruction = @"ROR.b";	break;
+			case Operation::RORw:	instruction = @"ROR.w";	break;
+			case Operation::RORl:	instruction = @"ROR.l";	break;
+			case Operation::RORm:	instruction = @"ROR.w";	break;
+
+			case Operation::ROXLb:	instruction = @"ROXL.b";	break;
+			case Operation::ROXLw:	instruction = @"ROXL.w";	break;
+			case Operation::ROXLl:	instruction = @"ROXL.l";	break;
+			case Operation::ROXLm:	instruction = @"ROXL.w";	break;
+
+			case Operation::ROXRb:	instruction = @"ROXR.b";	break;
+			case Operation::ROXRw:	instruction = @"ROXR.w";	break;
+			case Operation::ROXRl:	instruction = @"ROXR.l";	break;
+			case Operation::ROXRm:	instruction = @"ROXR.w";	break;
+
 			/*
 				TODO:
 
-				ASLb, ASLw, ASLl, ASLm,
-				ASRb, ASRw, ASRl, ASRm,
-				LSLb, LSLw, LSLl, LSLm,
-				LSRb, LSRw, LSRl, LSRm,
-				ROLb, ROLw, ROLl, ROLm,
-				RORb, RORw, RORl, RORm,
-				ROXLb, ROXLw, ROXLl, ROXLm,
-				ROXRb, ROXRw, ROXRl, ROXRm,
-
 				MOVEMl, MOVEMw,
 				MOVEPl, MOVEPw,
 
@@ -220,7 +247,9 @@ template <int index> NSString *operand(Preinstruction instruction) {
 			*/
 
 			// For now, skip any unmapped operations.
-			default: continue;
+			default:
+				++skipped;
+			continue;
 		}
 
 		NSString *const operand1 = operand<0>(found);
@@ -231,6 +260,7 @@ template <int index> NSString *operand(Preinstruction instruction) {
 
 		// Quick decoding not yet supported. TODO.
 		if(found.mode<0>() == AddressingMode::Quick || found.mode<1>() == AddressingMode::Quick) {
+			++skipped;
 			continue;
 		}
 
@@ -238,6 +268,7 @@ template <int index> NSString *operand(Preinstruction instruction) {
 		XCTAssertEqualObjects(instruction, expected, "%@ should decode as %@; got %@", instrName, expected, instruction);
 	}
 
+	NSLog(@"Skipped %d opcodes", skipped);
 }
 
 @end