Atari Connection Machine
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Atari ST family connectors pinouts

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Atari ST/TT ACSI DMA port

canon d-sub 19 Female

19 pin canon female at computer side
1 Data 0 11 GND
2 Data 1 12 Reset
3 Data 2 13 GND
4 Data 3 14 Acknowledge
5 Data 4 15 GND
6 Data 5 16 A 1
7 Data 6 17 GND
8 Data 7 18 Read/Write
9 Chip Select 19 Data Request
10 Interrupt Request

Atari ACSI internal in MEGA ST

idc 24 header
1 GND 2 D0
3 RESET 4 D1
5 GND 6 D2
7 GND 8 D3
9 GND 10 D4
11 ACK 12 D5
13 GND 14 D6
15 GND 16 D7
17 GND 18 CS
19 A1 20 GND
21 GND 22 RW
23 DRQ 24 IRQ

Atari ACSI internal in MEGA STE

idc 30 header
1 DA0 2 DB0
3 DA1 4 DB1
5 DA2 6 DB2
7 DA3 8 DB3
9 DA4 10 DB4
11 DA5 12 DB5
13 DA6 14 DB6
15 FA7 16 DB7
17 RESET 18 ACK
19 CS 20 A1
21 RW 22 DRQ
23 IRQ 24 not connected
25 GND 26 +5V
27 GND 28 +5V
29 GND 30 +5V
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