diff --git a/InstructionSets/x86/Implementation/PerformImplementation.hpp b/InstructionSets/x86/Implementation/PerformImplementation.hpp
index b7f0763ee..dfbcfd72d 100644
--- a/InstructionSets/x86/Implementation/PerformImplementation.hpp
+++ b/InstructionSets/x86/Implementation/PerformImplementation.hpp
@@ -496,6 +496,41 @@ void mul(IntT &destination_high, IntT &destination_low, IntT source, Status &sta
 	status.overflow = status.carry = destination_high;
 }
 
+template <typename IntT>
+void imul(IntT &destination_high, IntT &destination_low, IntT source, Status &status) {
+	/*
+		(as modified by https://www.felixcloutier.com/x86/daa ...)
+
+		IF (OperandSize = 8)
+			THEN
+				AX ← AL ∗ SRC (* signed multiplication *)
+				IF (AX = SignExtend(AL))
+					THEN CF = 0; OF = 0;
+					ELSE CF = 1; OF = 1;
+				FI;
+			ELSE IF OperandSize = 16
+				THEN
+					DX:AX ← AX ∗ SRC (* signed multiplication *)
+					IF (DX:AX = SignExtend(AX))
+						THEN CF = 0; OF = 0;
+						ELSE CF = 1; OF = 1;
+					FI;
+				ELSE (* OperandSize = 32 *)
+					EDX:EAX ← EAX ∗ SRC (* signed multiplication *)
+					IF (EDX:EAX = SignExtend(EAX))
+						THEN CF = 0; OF = 0;
+						ELSE CF = 1; OF = 1;
+					FI;
+		FI;
+	*/
+	using sIntT = typename std::make_signed<IntT>::type;
+	destination_high = (sIntT(destination_low) * sIntT(source)) >> (8 * sizeof(IntT));
+	destination_low = IntT(sIntT(destination_low) * sIntT(source));
+
+	const auto sign_extension = (destination_low & top_bit<IntT>()) ? IntT(~0) : 0;
+	status.overflow = status.carry = destination_high != sign_extension;
+}
+
 template <typename IntT>
 void and_(IntT &destination, IntT source, Status &status) {
 	/*
@@ -671,6 +706,15 @@ template <
 				Primitive::mul(registers.edx(), registers.eax(), source(), status);
 			}
 		return;
+		case Operation::IMUL_1:
+			if constexpr (data_size == DataSize::Byte) {
+				Primitive::imul(registers.ah(), registers.al(), source(), status);
+			} else if constexpr (data_size == DataSize::Word) {
+				Primitive::imul(registers.dx(), registers.ax(), source(), status);
+			} else if constexpr (data_size == DataSize::DWord) {
+				Primitive::imul(registers.edx(), registers.eax(), source(), status);
+			}
+		return;
 
 		case Operation::AND:	Primitive::and_(destination(), source(), status);		break;
 
diff --git a/InstructionSets/x86/Instruction.hpp b/InstructionSets/x86/Instruction.hpp
index 67a435cbb..d948fd88f 100644
--- a/InstructionSets/x86/Instruction.hpp
+++ b/InstructionSets/x86/Instruction.hpp
@@ -71,7 +71,7 @@ enum class Operation: uint8_t {
 	SUB,
 	/// Unsigned multiply; multiplies the source value by EAX, AX or AL, storing the result in EDX:EAX, DX:AX or AX.
 	MUL,
-	/// Single operand signed multiply; multiplies the source value by AX or AL, storing the result in DX:AX or AX.
+	/// Single operand signed multiply; multiplies the source value by EAX, AX or AL, storing the result in EDX:EAX, DX:AX or AX.
 	IMUL_1,
 	/// Unsigned divide; divide the source value by AX or AL, storing the quotient in AL and the remainder in AH.
 	DIV,
diff --git a/OSBindings/Mac/Clock SignalTests/8088Tests.mm b/OSBindings/Mac/Clock SignalTests/8088Tests.mm
index 1a741a5b1..d9bf0bdaa 100644
--- a/OSBindings/Mac/Clock SignalTests/8088Tests.mm	
+++ b/OSBindings/Mac/Clock SignalTests/8088Tests.mm	
@@ -278,56 +278,59 @@ struct FailedExecution {
 - (NSArray<NSString *> *)testFiles {
 	NSString *path = [NSString stringWithUTF8String:TestSuiteHome];
 	NSSet *allowList = [NSSet setWithArray:@[
-//		@"37.json.gz",	// AAA
-//		@"3F.json.gz",	// AAS
-//		@"D4.json.gz",	// AAM
-//		@"D5.json.gz",	// AAD
-//		@"27.json.gz",	// DAA
-//		@"2F.json.gz",	// DAS
-//
-//		@"98.json.gz",	// CBW
-//		@"99.json.gz",	// CWD
-//
-//		// ESC
-//		@"D8.json.gz",	@"D9.json.gz",	@"DA.json.gz",	@"DB.json.gz",
-//		@"DC.json.gz",	@"DD.json.gz",	@"DE.json.gz",	@"DE.json.gz",
-//
-//		// Untested: HLT, WAIT
-////
-//		// ADC
-//		@"10.json.gz",	@"11.json.gz",	@"12.json.gz",	@"13.json.gz",	@"14.json.gz",	@"15.json.gz",
-//		@"80.2.json.gz", @"81.2.json.gz", @"83.2.json.gz",
-//
-//		// ADD
-//		@"00.json.gz",	@"01.json.gz",	@"02.json.gz",	@"03.json.gz",	@"04.json.gz",	@"05.json.gz",
-//		@"80.0.json.gz", @"81.0.json.gz", @"83.0.json.gz",
-//
-//		// SBB
-//		@"18.json.gz",	@"19.json.gz",	@"1A.json.gz",	@"1B.json.gz",	@"1C.json.gz",	@"1D.json.gz",
-//		@"80.3.json.gz", @"81.3.json.gz", @"83.3.json.gz",
-//
-//		// SUB
-//		@"28.json.gz",	@"29.json.gz",	@"2A.json.gz",	@"2B.json.gz",	@"2C.json.gz",	@"2D.json.gz",
-//		@"80.5.json.gz", @"81.5.json.gz", @"83.5.json.gz",
+		@"37.json.gz",	// AAA
+		@"3F.json.gz",	// AAS
+		@"D4.json.gz",	// AAM
+		@"D5.json.gz",	// AAD
+		@"27.json.gz",	// DAA
+		@"2F.json.gz",	// DAS
+
+		@"98.json.gz",	// CBW
+		@"99.json.gz",	// CWD
+
+		// ESC
+		@"D8.json.gz",	@"D9.json.gz",	@"DA.json.gz",	@"DB.json.gz",
+		@"DC.json.gz",	@"DD.json.gz",	@"DE.json.gz",	@"DE.json.gz",
+
+		// Untested: HLT, WAIT
+
+		// ADC
+		@"10.json.gz",	@"11.json.gz",	@"12.json.gz",	@"13.json.gz",	@"14.json.gz",	@"15.json.gz",
+		@"80.2.json.gz", @"81.2.json.gz", @"83.2.json.gz",
+
+		// ADD
+		@"00.json.gz",	@"01.json.gz",	@"02.json.gz",	@"03.json.gz",	@"04.json.gz",	@"05.json.gz",
+		@"80.0.json.gz", @"81.0.json.gz", @"83.0.json.gz",
+
+		// SBB
+		@"18.json.gz",	@"19.json.gz",	@"1A.json.gz",	@"1B.json.gz",	@"1C.json.gz",	@"1D.json.gz",
+		@"80.3.json.gz", @"81.3.json.gz", @"83.3.json.gz",
+
+		// SUB
+		@"28.json.gz",	@"29.json.gz",	@"2A.json.gz",	@"2B.json.gz",	@"2C.json.gz",	@"2D.json.gz",
+		@"80.5.json.gz", @"81.5.json.gz", @"83.5.json.gz",
 
 		// MUL
 		@"F6.4.json.gz",	@"F7.4.json.gz",
 
-//		// NOP
-//		@"90.json.gz",
+		// IMUL_1
+		@"F6.5.json.gz",	@"F7.5.json.gz",
+
+		// NOP
+		@"90.json.gz",
 
 		// AND
-//		@"20.json.gz",	@"21.json.gz",	@"22.json.gz",	@"23.json.gz",	@"24.json.gz",	@"25.json.gz",
-//		@"80.4.json.gz", @"81.4.json.gz", @"83.4.json.gz",
-//
-//		// CALL
-//		@"E8.json.gz",	@"FF.2.json.gz",
-//		@"9A.json.gz",	@"FF.3.json.gz",
-//
-//		@"F8.json.gz",	// CLC
-//		@"FC.json.gz",	// CLD
-//		@"FA.json.gz",	// CLI
-//		@"F5.json.gz",	// CMC
+		@"20.json.gz",	@"21.json.gz",	@"22.json.gz",	@"23.json.gz",	@"24.json.gz",	@"25.json.gz",
+		@"80.4.json.gz", @"81.4.json.gz", @"83.4.json.gz",
+
+		// CALL
+		@"E8.json.gz",	@"FF.2.json.gz",
+		@"9A.json.gz",	@"FF.3.json.gz",
+
+		@"F8.json.gz",	// CLC
+		@"FC.json.gz",	// CLD
+		@"FA.json.gz",	// CLI
+		@"F5.json.gz",	// CMC
 	]];
 
 	NSSet *ignoreList = nil;
@@ -585,7 +588,7 @@ struct FailedExecution {
 
 - (void)testDecoding {
 	NSMutableArray<NSString *> *failures = [[NSMutableArray alloc] init];
-	for(NSString *file in [self testFiles]) {
+	for(NSString *file in [self testFiles]) @autoreleasepool {
 		for(NSDictionary *test in [self testsInFile:file]) {
 			// A single failure per instruction is fine.
 			if(![self applyDecodingTest:test file:file assert:YES]) {
@@ -604,7 +607,7 @@ struct FailedExecution {
 - (void)testExecution {
 	NSDictionary *metadata = [self metadata];
 
-	for(NSString *file in [self testFiles]) {
+	for(NSString *file in [self testFiles]) @autoreleasepool {
 		// Determine the metadata key.
 		NSString *const name = [file lastPathComponent];
 		NSRange first_dot = [name rangeOfString:@"."];