John Bell Engineering Z80 card 80-280	

50 pin edge connector, .1 inch c-c
one side used only

	Z80	Z80
pin	CPU	PIO	other	function

1	24			/wait
2			+5V
3	26			/reset
4		18		ARDY	out
5		16		/ASTB in
6		15		A0
7		14		A1
8		13		A2
9		12		A3
10		10		A4
11		9		A5
12		8		A6
13		7		A7
14		27		B0
15		28		B1
16		29		B2
17		30		B3
18		31		B4
19		32		B5
20		33		B6
21		34		B7
22		21		BRDY out
23		17		/BSTB in
24			none
25			ground