remove debugging

README.md

@@ -12,4 +12,3 @@ Keyboard
 - F4: load program from tape (by simulating typing it)
 - F6: checkpoint machine
 - F7: restore from current checkpoint on tape
-- F8: enter debug mode (display current processor status on serial port)

apple1.ino

@@ -84,9 +84,6 @@ void loop() {
 				if (filename)
 					restore(io.tape, PROGRAMS, filename);
 				break;
-			case PS2_F8:
-				cpu.debug();
-				break;
 			default:
 				io.up(key);
 				break;