diff --git a/Machines/Apple/AppleIIgs/ADB.cpp b/Machines/Apple/AppleIIgs/ADB.cpp
index 4ec09e6ea..27a072024 100644
--- a/Machines/Apple/AppleIIgs/ADB.cpp
+++ b/Machines/Apple/AppleIIgs/ADB.cpp
@@ -13,29 +13,59 @@
 using namespace Apple::IIgs::ADB;
 
 uint8_t GLU::get_keyboard_data() {
-	return 0;
+	// The classic Apple II serial keyboard register:
+	// b7:		key strobe.
+	// b6–b0:	ASCII code.
+	return 0x00;
 }
 
 uint8_t GLU::get_mouse_data() {
+	// Alternates between returning x and y values.
+	//
+	// b7: 		1 = button is up; 0 = button is down.
+	// b6:		delta sign bit; 1 = negative.
+	// b5–b0:	mouse delta.
 	return 0x80;
 }
 
 uint8_t GLU::get_modifier_status() {
+	// b7:		1 = command key pressed; 0 = not.
+	// b6:		option key.
+	// b5:		1 = modifier key latch has been updated, no key has been pressed; 0 = not.
+	// b4:		any numeric keypad key.
+	// b3:		a key is down.
+	// b2:		caps lock is pressed.
+	// b1:		control key.
+	// b0:		shift key.
 	return 0x00;
 }
 
 uint8_t GLU::get_data() {
+	// b0–2:	number of data bytes to be returned.
+	// b3:		1 = a valid service request is pending; 0 = no request pending.
+	// b4:		1 = control, command and delete keys have been pressed simultaneously; 0 = they haven't.
+	// b5:		1 = control, command and reset have all been pressed together; 0 = they haven't.
+	// b6:		1 = ADB controller encountered an error and reset itself; 0 = no error.
+	// b7:		1 = ADB has received a response from the addressed ADB device; 0 = no respone.
 	return 0x00;
 }
 
 uint8_t GLU::get_status() {
+	// b7:	1 = mouse data register is full; 0 = empty.
+	// b6:	1 = mouse interrupt is enabled.
+	// b5:	1 = command/data has valid data.
+	// b4:	1 = command/data interrupt is enabled.
+	// b3:	1 = keyboard data is full.
+	// b2:	1 = keyboard data interrupt is enabled.
+	// b1:	1 = mouse x-data is available; 0 = y.
+	// b0:	1 = command register is full (set when command is written); 0 = empty (cleared when data is read).
 	return 0x00;
 }
 
-void GLU::set_command(uint8_t) {
-	printf("TODO: set ADB command\n");
+void GLU::set_command(uint8_t command) {
+	printf("TODO: set ADB command: %02x\n", command);
 }
 
-void GLU::set_status(uint8_t) {
-	printf("TODO: set ADB status\n");
+void GLU::set_status(uint8_t status) {
+	printf("TODO: set ADB status %02x\n", status);
 }
diff --git a/Machines/Apple/AppleIIgs/AppleIIgs.cpp b/Machines/Apple/AppleIIgs/AppleIIgs.cpp
index 599f21859..92de873f6 100644
--- a/Machines/Apple/AppleIIgs/AppleIIgs.cpp
+++ b/Machines/Apple/AppleIIgs/AppleIIgs.cpp
@@ -299,20 +299,20 @@ class ConcreteMachine:
 				}
 			}
 
-			printf("%06x %s %02x", address, isReadOperation(operation) ? "->" : "<-", *value);
-			if(operation == CPU::WDC65816::BusOperation::ReadOpcode) {
-				printf(" a:%04x x:%04x y:%04x s:%04x e:%d p:%02x db:%02x pb:%02x d:%04x\n",
-					m65816_.get_value_of_register(CPU::WDC65816::Register::A),
-					m65816_.get_value_of_register(CPU::WDC65816::Register::X),
-					m65816_.get_value_of_register(CPU::WDC65816::Register::Y),
-					m65816_.get_value_of_register(CPU::WDC65816::Register::StackPointer),
-					m65816_.get_value_of_register(CPU::WDC65816::Register::EmulationFlag),
-					m65816_.get_value_of_register(CPU::WDC65816::Register::Flags),
-					m65816_.get_value_of_register(CPU::WDC65816::Register::DataBank),
-					m65816_.get_value_of_register(CPU::WDC65816::Register::ProgramBank),
-					m65816_.get_value_of_register(CPU::WDC65816::Register::Direct)
-				);
-			} else printf("\n");
+//			printf("%06x %s %02x", address, isReadOperation(operation) ? "->" : "<-", *value);
+//			if(operation == CPU::WDC65816::BusOperation::ReadOpcode) {
+//				printf(" a:%04x x:%04x y:%04x s:%04x e:%d p:%02x db:%02x pb:%02x d:%04x\n",
+//					m65816_.get_value_of_register(CPU::WDC65816::Register::A),
+//					m65816_.get_value_of_register(CPU::WDC65816::Register::X),
+//					m65816_.get_value_of_register(CPU::WDC65816::Register::Y),
+//					m65816_.get_value_of_register(CPU::WDC65816::Register::StackPointer),
+//					m65816_.get_value_of_register(CPU::WDC65816::Register::EmulationFlag),
+//					m65816_.get_value_of_register(CPU::WDC65816::Register::Flags),
+//					m65816_.get_value_of_register(CPU::WDC65816::Register::DataBank),
+//					m65816_.get_value_of_register(CPU::WDC65816::Register::ProgramBank),
+//					m65816_.get_value_of_register(CPU::WDC65816::Register::Direct)
+//				);
+//			} else printf("\n");
 
 			Cycles duration = Cycles(5);