main:	mov pc,sp
			tst -(sp)
			mov #input,@#60		;input procedure for the keyboard interrupt vector
			mov #200, @#62		;setting the keyboard's priority to 4
			;mov #output,@#64	;output procedure for the "printer" (screen) interrupt vector
			mov #200, @#66		;setting the printer's priority to 4
			mov #counter,@#100	;timer procedure for the clock interrupt vector
			mov #300, @#102		;setting the printer's priority to 6
			mov #100,@#tps		;enabling interrupts for the printer
			mov #101,@#tks		;enabling interrupts & reading for the keyboard
waitAt:		tstb @#tps			;printing the start of a command line to the screen
			bpl waitAt
			movb #'@,@#tpb
waitSp:		tstb @#tps
			bpl waitSp
			movb #' ,@#tpb
w:			wait
			br w