Spectravideo SVI318/328 Expansion Bus

Spectravideo SVI-605 (Super Expander) can be connected to this bus.

Pinout

50 PIN MALE EDGE the computer.

Pin	Name	Dir	Description
1	+5v	→	Power, 300mA
2	/CNTRL2	←	Game adapter control signal
3	+12v	→	Power, 100mA
4	-12v	→	Power, 50mA
5	/CNTRL1	←	Game adapter control signal
6	/WAIT	←	Z80 WAIT
7	/RST	←	Z80 RST
8	CPU CLK	→	Buffered 3.58MHz system clock
9	A15	→	Buffered Address bus
10	A14	→	"
11	A13	→	"
12	A12	→	"
13	A11	→	"
14	A10	→	"
15	A9	→	"
16	A8	→	"
17	A7	→	"
18	A6	→	"
19	A5	→	"
20	A4	→	"
21	A3	→	"
22	A2	→	"
23	A1	→	"
24	A0	→	"
25	/RFSH	→	RAM expansion refresh
26	/EXCSR	←	Video-CPU write select
27	/M1	→	Z80 M1
28	/EXCSW	←	CPU-Video write select
29	/WR	→	Z80 WR
30	/MREQ	→	Z80 MREQ
31	/IORQ	→	Z80 IORQ
32	/RD	→	Z80 RD
33	D0	↔	Buffered Data Bus
34	D1	↔	"
35	D2	↔	"
36	D3	↔	"
37	D4	↔	"
38	D5	↔	"
39	D6	↔	"
40	D7	↔	"
41	CSOUND	←	Audio input signal
42	/INT	←	Z80 INT
43	/RAMDIS	←	Disable user RAM
44	/ROMDIS	←	Disable basic ROM
45	/BK32	→	Enable bank 32 Memory (8000-ffff)
46	/BK31	→	Enable bank 31 Memory (0000-7FFF)
47	/BK22	→	Enable bank 22 Memory (8000-FFFF)
48	/BK21	→	Enable bank 21 Memory (0000-7FFF)
49	GND	─	System Ground
50	GND	─	System Ground