Macintosh to PC Null Modem


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 Description Mac DIN 8 Male PC DB 25 Female PC 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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