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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 MEGA ST/MEGA STE/TT030 external keyboard

RJ12 at computer side

1	+5V DC
2	+5V DC
3	Tx Data
4	Rx Data
5	GND
6	GND

Internal keyboard header in Falcon030/1040STE/1040STF(M)

10	*	KROK	only Falcon030
9	*	KTOK	only Falcon030
8	*	Ground
7	*	/RESET
6	*	Tx data
5	*	Rx data
4	*	+5V
3	*	Floppy/HDD LED
2	o	key - not connected
1	*	Ground

Internal keyboard header in 520ST(M)
internal header in MEGA ST keyboard

18	*	Not connected
17	*	Joystick 1 - pin 5
16	*	/Reset (Not connected in MEGA ST keyboard)
15	*	Tx data
14	*	Rx data
13	*	+5V
12	*	Mouse / joystick 0 - XB / up
11	*	Mouse / joystick 0 - mouse left button / fire
10	*	Mouse / joystick 0 - XA / down
9	*	Mouse / joystick 0 - YA / left
8	*	Mouse / joystick 0 - YB / right
7	*	Joystick 1 - up
6	*	Joystick 1 - fire / mouse right button
5	*	Joystick 1 - down
4	*	Joystick 1 - left
3	*	Joystick 1 - right
2	o	Key - not connected
1	*	Ground