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50 pins connector
50 pin MALE EDGE connector at 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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Source(s) of this and additional information: SVI 328 Mk II User Manual; Rob Gill
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