Atari Connection Machine
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Atari ST family connectors pinouts

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Atari MEGA ST/MEGA STE/TT030 external keyboard

RJ12 Female at computer side
1 +5V DC RJ12 Female
2 +5V DC
3 Transmit Data
4 Receive Data
5 GND
6 GND

Internal keyboard header in Falcon030/1040STE/1040STF(M)
10 * KROK only Falcon030
9 * KTOK only Falcon030
8 * Ground
7 * XRESET
6 * TXD
5 * RXD
4 * +5V
3 * Floppy/HDD LED
2 o key - not connected
1 * Ground

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