Atari ST Pinouts

As a someone always seems to be asking for this info, here are the pinouts to all of the ports I could get hold of. If anyone has the STE extended joystick port ones, please mail me a copy so I can add them. Aside from those, I think I've got all the others.

These are taken from the official ST manuals, and some are probably © Atari Corp. If they complain to me, I'll take them down. Until then, here they are :

The connector type as listed refers to the name give in electronic component guides and the gender refers to the connector on the motherboard. For the connector to plug into it, reverse this.

Serial and Modem Ports

The original range of Ataris all came with standard RS232 female DB25 connectors. However, later machines (the MSTE, TT and Falcon) came with PC AT-style male DB9 connectors.

For obscure reasons, there are 3 different implimentations of the 9 way connector, each very slightly different. In most situations though, this won't make any difference to the user.

PinModem 1Modem 2Serial 2
1 Carrier Detect N/C Carrier Detect
2 Received Data Received Data Received Data
3 Transmit Data Transmit Data Transmit Data
4 Data Terminal ReadyData Terminal ReadyData Terminal Ready
5 Ground Ground Ground
6 N/C N/C Data Set Ready
7 RTS RTS RTS
8 CTS N/C CTS
9 Ring Indicator N/C Sync Clock

Pin Function
1 Protective ground
2 Transmit data
3 Receive data
4 RTS
5 CTS
6 N/C
7 Signal ground
8 Data carrier repeat
9-19 N/C
20 Data Terminal Ready
21 N/C
22 Ring indicator
23-25 N/C

Parallel Printer Port

Female DB25
Pin Function
1 Strobe
2 Data 0
3 Data 1
4 Data 2
5 Data 3
6 Data 4
7 Data 5
8 Data 6
9 Data 7
10 N/C
11 Busy
12-17 N/C
18-25 Ground

Mouse and Joystick

Male DB9
Pin Mouse/Joystick 0Joystick 1
1 XB/Up Up
2 XA/Down Down
3 YA/Left Left
4 YB/Right Right
5 *Middle Button/joystick 1 up Reserved
6 Left Button/Fire Fire
7 +5V DC +5V DC
8 Ground Ground
9 Right Button/Joystick 1 Fire N/C
* As far as I know, this only exists on MSTE, and is marked in other manuals as reserved or not connected.

Monitor

Female 13 Pin DIN
Pin Function
1 Audio Out
2 Composite Video
3 Clock Select
4 Monochrome detect/Clock in
5 Audio In
6 Green
7 Red
8 12V Pullup
9 Horizontal Sync
10 Blue
11 Monochrome
12 Vertical Sync
13 Ground

External Disk Drive

Female 14 pin DIN
Pin Function
1 Read data
2 Side 0 select
3 Ground
4 Index Pulse
5 External Drive select
6 Internal pullup
7 Ground
8 Motor on
9 Direction in
10 Step
11 Write Data
12 Write gate
13 Track 00 Detect
14 Write Protect

Cartridge Port

PCB Edge 0.156 spacing (?) 40 Way
Pin Function PinFunction
1 5V DC 21 Address 8
2 5V DC 22 Address 14
3 Data 14 23 Address 7
4 Data 15 24 Address 9
5 Data 12 25 Address 6
6 Data 13 26 Address 10
7 Data 10 27 Address 5
8 Data 11 28 Address 12
9 Data 8 29 Address 11
10 Data 9 30 Address 4
11 Data 6 31 *ROM Select 3
12 Data 7 32 Address 3
13 Data 4 33 *ROM Select 4
14 Data 5 34 Address 2
15 Data 2 35 *Upper Data Strobe
16 Data 3 36 Address 1
17 Data 0 37 *Lower Data Strobe
18 Data 1 38 Ground
19 Address 13 39 Ground
20 Address 15 40 Ground

MIDI Ports

Female 5 Way (Type A) DIN
Pin MIDI In MIDI Out
1 THRU Transmit Data N/C
2 Shield Grouond N/C
3 THRU Loop Return N/C
4 OUT Transmit Data IN Receive Data
5 OUT Loop Return IN Loop Return

ASCI DMA Port

Female DB19
Pin FunctionPin Function
1 Data 0 11 Ground
2 Data 1 12 Reset
3 Data 2 13 Ground
4 Data 3 14 Acknowledge
5 Data 4 15 Ground
6 Data 5 16 A1
7 Data 6 17 Ground
8 Data 7 18 Read/Write
9 Chip Select19 Data Request
10 Interrupt Request

Apple LAN Port

Female 8 Way MiniDIN
Pin Function
1 Handshake Output
2 Handshake input or Internal Clock
3 *Transmit Data
4 Ground
5 *Receive Data
6 Transmit Data
7 General Purpose Input
8 Receive Data