diff --git a/InstructionSets/x86/Decoder.cpp b/InstructionSets/x86/Decoder.cpp
index 622b81bf4..2487223cc 100644
--- a/InstructionSets/x86/Decoder.cpp
+++ b/InstructionSets/x86/Decoder.cpp
@@ -833,7 +833,17 @@ std::pair<int, typename Decoder<model>::InstructionT> Decoder<model>::decode(con
 				destination_ = memreg;
 
 				switch(reg) {
-					default:	undefined();
+					default:
+						if constexpr (model == Model::i8086) {
+							if(source_ == Source::eCX) {
+								SetOperation(Operation::SETMOC);
+							} else {
+								SetOperation(Operation::SETMO);
+							}
+						} else {
+							undefined();
+						}
+					break;
 
 					case 0:		SetOperation(Operation::ROL);	break;
 					case 1:		SetOperation(Operation::ROR);	break;
diff --git a/InstructionSets/x86/Instruction.cpp b/InstructionSets/x86/Instruction.cpp
index 0c50b996e..bacbbd9d7 100644
--- a/InstructionSets/x86/Instruction.cpp
+++ b/InstructionSets/x86/Instruction.cpp
@@ -138,6 +138,9 @@ std::string InstructionSet::x86::to_string(Operation operation, DataSize size) {
 		case Operation::XLAT:	return "xlat";
 		case Operation::SALC:	return "salc";
 
+		case Operation::SETMO:	return "setmo";
+		case Operation::SETMOC:	return "setmoc";
+
 		case Operation::Invalid:	return "invalid";
 
 		default:
diff --git a/InstructionSets/x86/Instruction.hpp b/InstructionSets/x86/Instruction.hpp
index 714ce6aae..44b9316fb 100644
--- a/InstructionSets/x86/Instruction.hpp
+++ b/InstructionSets/x86/Instruction.hpp
@@ -214,6 +214,15 @@ enum class Operation: uint8_t {
 	/// Set AL to FFh if carry is set; 00h otherwise.
 	SALC,
 
+	//
+	// 8086 exclusives.
+	//
+
+	/// Set destination to ~0 if CL is non-zero.
+	SETMOC,
+	/// Set destination to ~0.
+	SETMO,
+
 	//
 	// 80186 additions.
 	//
@@ -222,7 +231,7 @@ enum class Operation: uint8_t {
 	/// stored at the location indicated by the source register, which will point to two
 	/// 16- or 32-bit words, the first being a signed lower bound and the signed upper.
 	/// Raises a bounds exception if not.
-	BOUND = SALC,
+	BOUND = SETMOC,
 
 
 	/// Create stack frame. See operand() for the nesting level and offset()
diff --git a/OSBindings/Mac/Clock SignalTests/8088Tests.mm b/OSBindings/Mac/Clock SignalTests/8088Tests.mm
index d52e20aca..fe45246bc 100644
--- a/OSBindings/Mac/Clock SignalTests/8088Tests.mm	
+++ b/OSBindings/Mac/Clock SignalTests/8088Tests.mm	
@@ -148,15 +148,7 @@ std::string to_string(
 	NSSet *allowList = [NSSet setWithArray:@[
 	]];
 
-	// Unofficial opcodes; ignored for now.
-	NSSet *ignoreList =
-		[NSSet setWithObjects:
-
-			// Undocumented instructions.
-			@"D0.6.json.gz",	@"D1.6.json.gz",	@"D2.6.json.gz",	@"D3.6.json.gz",
-
-			nil
-		];
+	NSSet *ignoreList = nil;
 
 	NSArray<NSString *> *files = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:nil];
 	files = [files filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(NSString* evaluatedObject, NSDictionary<NSString *,id> *) {
@@ -210,9 +202,9 @@ std::string to_string(
 			operation += " ";
 			if(operands > 1 && instruction.destination().source() != Source::None) {
 				operation += to_string(instruction.destination(), instruction, offsetLength, immediateLength);
-				operation += ", ";
 			}
 			if(operands > 0 && instruction.source().source() != Source::None) {
+				if(operands > 1) operation += ", ";
 				operation += to_string(instruction.source(), instruction, offsetLength, immediateLength);
 			}
 			if(displacement) {
@@ -279,6 +271,7 @@ std::string to_string(
 		case Operation::ROL:	case Operation::ROR:
 		case Operation::SAL:	case Operation::SAR:
 		case Operation::SHR:
+		case Operation::SETMO:	case Operation::SETMOC:
 			const int operands = max_num_operands(instruction.operation);
 			const bool displacement = has_displacement(instruction.operation);
 			operation += " ";