MZ-80A Keyboard Map

written by Maurice Hawes
Source: SUC-magazine July 2001, Volume 21, Number 2, p. 11

This map appears on page 167 of the MZ-80A Owners Manual, in a slightly different format. However, no information is given there on how to achieve independent key scanning.

( Note that unused points in the matrix are indicated by two rows of "****" )

		KEY DATA BITS
		0	1	2	3	4	5	6	7
		X= $01	$02	$04	$08	$10	$20	$40	$80
		( Bit is zero if key is pressed )
Y =	$F0	SHIFT	GRPH	** **	** **	** **	** **	** **	BREAK CTL
	$F1	Z	** **	INST DEL	A	Q	W	! 1	" 2
	$F2	C	X	S	D	E	R	# 3	$ 4
	$F3	B	V	F	G	T	Y	% 5	& 6
	$F4	SPACE	N	H	J	U	I	' 7	( 8
	$F5	M	< ,	K	L	O	P	) 9	- 0
	$F6	> .	/	+ ;	* :	' @	{ [	= -	~ ^
	$F7	?	** **	} ]	CR	UP DOWN	RIGHT LEFT	\| \	CLR HOME
	$F8	(NP) 0	(NP) 00	(NP) 1	(NP) 2	(NP) 4	(NP) 5	(NP) 7	(NP) 8
	$F9	(NP)	****	(NP)	****	(NP)	(NP)	(NP)	(NP)

(NP) = key is on the seperate numeric keypad

NOTE that,on the MZ-80A, the two SHIFT keys are mapped to the same point on the matrix. Therefore, you can STROBE row $F0 and then check KEY DATA BIT 0, which will be ZERO if one of the two SHIFT keys is being pressed.

( It will also be ZERO if both SHIFT keys are being pressed simultaneously, but that is a rather academic point ).