diff --git a/Machines/Commodore/1540/Commodore1540.cpp b/Machines/Commodore/1540/Commodore1540.cpp
index a59cfcb8d..521e0fdbf 100644
--- a/Machines/Commodore/1540/Commodore1540.cpp
+++ b/Machines/Commodore/1540/Commodore1540.cpp
@@ -30,6 +30,9 @@ void Machine::set_serial_bus(std::shared_ptr<::Commodore::Serial::Bus> serial_bu
 
 unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value)
 {
+//	if(operation == CPU6502::BusOperation::ReadOpcode && (address >= 0xE9C9 && address <= 0xEA2D)) printf("%04x\n", address);
+//	if(operation == CPU6502::BusOperation::ReadOpcode && (address == 0xE887)) printf("A: %02x\n", get_value_of_register(CPU6502::Register::A));
+
 /*	static bool log = false;
 
 	if(operation == CPU6502::BusOperation::ReadOpcode)
diff --git a/OSBindings/Mac/Clock SignalTests/C1540Tests.swift b/OSBindings/Mac/Clock SignalTests/C1540Tests.swift
index 9facf16ee..add83142e 100644
--- a/OSBindings/Mac/Clock SignalTests/C1540Tests.swift	
+++ b/OSBindings/Mac/Clock SignalTests/C1540Tests.swift	
@@ -40,7 +40,7 @@ class C1540Tests: XCTestCase {
 		// transmit bits
 		for _ in 0..<8 {
 			// load data line
-			c1540.dataLine = (shiftedValue & 1) == 0
+			c1540.dataLine = (shiftedValue & 1) == 1
 			shiftedValue >>= 1
 
 			// toggle clock