Piedinature - Pinouts
Macintosh to PC Null Modem

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Source: Roy Wood

This cable allows you to connect a Macintosh to a PC through the serial port.
"It worked perfectly, allowing me to do PPP and regular serial connections from the mac to the PC (which happened to be running Linux)."

8 Pin DIN Male Macintosh connector8 Pin DIN Male Macintosh connector (to Macintosh computer).

25 PIN D-SUB Female25 PIN D-SUB Female (to PC serial port).

9 PIN D-SUB Female9 PIN D-SUB Female (to PC serial port).

Macintosh Signal DescriptionMac DIN 8 MalePC DB 25 FemalePC DB 9 Female
HSKo (Output Handshake)1 (OUT)5, 6, 8 (CTS, DSR, DCD)8, 6, 1 (CTS, DSR, DCD)
HSKi (Input Handshake)2 (IN)4 (RTS)7 (RTS)
TxD- (Transmit Data -)3 (OUT)3 (RxD)2 (RxD)
GND (Signal Ground)4 (GND)7 (GND)5 (GND)
RxD- (Receive Data -)5 (IN)2 (TxD)3 (TxD)
TxD+ (Transmit Data +)6 (OUT)--
GPi (General Purpose Input)7 (IN)20 (DTR)4 (DTR)
RxD+ (Receive Data +)8 (IN, GND = RS232 Mode)7 (GND)5 (GND)




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