Macintosh modem (Without DTR) Cable Pinout -
Signal mini-DIN8 Pin Dir DB 25 Pin Signal
HSKo 1 OUT 4 RTS
HSKi 2 IN 5 CTS
TxD- 3 OUT 2 TxD
RxD- 5 IN 3 RxD
GND+RxD+ 4+8 - 7 GND
6+20 DSR+DTR

8 pin mini-DIN male connector layout 25 pin D-SUB male connector diagram

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