Technical information | Sega G-80 guide

Technical information:

This info is for any of you technical-types that want to make your own speech-switchers, sound switchers, or whatever. You’ll notice that the Daughtercard has an expansion header on it. This gives you access to two 8-bit output latches. Holding the Daughtercard so that the Z-80 is on the right, the header pinout is as follows:

	D0	D1	D2	D3	D4	D5	D6	D7
+5V	Latch2	Latch2	Latch2	Latch2	Latch2	Latch2	Latch2	Latch2	GND
+5V	Latch1	Latch1	Latch1	Latch1	Latch1	Latch1	Latch1	Latch1	GND

D7 is the most significant bit, D0 is the least significant bit. As games are selected the following values are placed on Latch1:

snd_map:		;	D7654 3210
.db	h'10	; star trek	0001 0000	(USB)
.db	h'21	; eliminator	0010 0001	(elim/zek)
.db	h'42	; space fury	0100 0010	(sf)
.db	h'13	; tac/scan	0001 0011	(USB)
.db	h'24	; zektor	0010 0100	(elim/zek)
.db	h'25	; elim 2p	0010 0101	(elim/zek)
.db	h'26	; elim 4p	0010 0110	(elim/zek)
.db	h'47	; sf (original)	0100 0111	(sf)
.db	h'10	; self test

Sega G-80 Multigame, Version 1.0