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Atari ST family connectors pinouts

• ST power supply
• ST floppy drive power supply


• ST Monitor out
• TT Monitor out
• Falcon Monitor out


• ST joystick / mouse
• STe enhanced joystick
• MEGA ST/TT keyboard


• MIDI In and Out
• ST Modem 1
• Falcon Serial
• LAN


• ST/Falcon parallel


• ST floppy
• ST Floppy internal
• ST floppy drive IN and OUT
• ST/TT DMA ACSI port
• TT SCSI port


• ROM port


• Falcon DSP port

Atari ST/TT ACSI DMA port

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 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 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