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Spectravideo SVI318/328 Expansion Bus

 (at the computer)

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	I/O	Buffered Data Bus
34	D1	I/O	"
35	D2	I/O	"
36	D3	I/O	"
37	D4	I/O	"
38	D5	I/O	"
39	D6	I/O	"
40	D7	I/O	"
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

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