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ABC-bus

   +-+
 a | +-+ b
 1 |o o| 1
 2 |o o| 2
 3 |o o| 3
 4 |o o| 4
 5 |o o| 5
 6 |o o| 6
 7 |o o| 7
 8 |o o| 8
 9 |o o| 9
10 |o o| 10
11 |o o| 11
12 |o o| 12
13 |o o| 13
14 |o o| 14
15 |o o| 15
16 |o o| 16
17 |o o| 17
18 |o o| 18
19 |o o| 19
20 |o o| 20
21 |o o| 21
22 |o o| 22
23 |o o| 23
24 |o o| 24
25 |o o| 25
26 |o o| 26
27 |o o| 27
28 |o o| 28
29 |o o| 29
30 |o o| 30
31 |o o| 31
32 |o o| 32
   + +-+   (at computer)
   +-+

Pin Dir Name Note
a1 --> -12V Max 100mA (incl b1)
a2 --> 0V
a3 <-- /RESIN
a4 --- GND
a5 --> /XMEMW
a6 <-> D7 Data bit 7
a7 <-> D6 Data bit 6
a8 <-> D5 Data bit 5
a9 <-> D4 Data bit 4
a10 <-> D3 Data bit 3
a11 <-> D2 Data bit 2
a12 <-> D1 Data bit 1
a13 <-> D0 Data bit 0
a14 n/c
a15 --> /RST
a16 --> /STATUS Input strobs STATUS
a17 --> /INP Input strobs INP
a18 --> /C4 Out strobs C4
a19 --> /C3 Out strobs C3
a20 --> /C2 Out strobs C2
a21 --> /C1 Out strobs C1
a22 --> /OUT Out strobs OUT
a23 --> /CS Out strobs CS
a24 --- GND
a25 --- GND
a26 --- GND
a27 --- GND
a28 --- GND
a29 --- GND
a30 <-- READY
a31 --> +5V Max 250mA (incl b31)
a32 --> +12V Max 100mA (incl b32)
b1 --> -12V Max 100mA (incl a1)
b2 --> 0V
b3 --> GND
b4 --> /XMEMFL
b5 --> Ø
b6 --- GND
b7 --- GND
b8 --- GND
b9 --- GND
b10 --- GND
b11 --- GND
b12 --- GND
b13 <-> /INT
b14 --> A15 Address bit 15
b15 --> A14 Address bit 14
b16 --> A13 Address bit 13
b17 --> A12 Address bit 12
b18 --> A11 Address bit 11
b19 --> A10 Address bit 10
b20 --> A9 Address bit 9
b21 --> A8 Address bit 8
b22 --> A7 Address bit 7
b23 --> A6 Address bit 6
b24 --> A5 Address bit 5
b25 --> A4 Address bit 4
b26 --> A3 Address bit 3
b27 --> A2 Address bit 2
b28 --> A1 Address bit 1
b29 --> A0 Address bit 0
b30 n/c
b31 --> +5V Max 250mA (incl a31)
b32 --> +12V Max 100mA (incl a32)

Note: Direction is computer relative devices.

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