Hardware pinouts information and cables schemes

Mac to C64 Nullmodem cable pinout

serial interface cable

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The RS-232 on the C64 is a little bit strange. It uses inverted TTL level of signals. The RS-422 ports on the Macintosh has both an inverted and non-inverted input By using the inverted instead of non-inverted the inverted C64 level is back to normal



Mac C64
GND+RXD-4+51+12+A+NGND
RXD+8MTXD (PA2)
TXD+6B+CRXD (FLAG2+PB0)
  D+ERTS+DTR (PB1+PB2)


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24 pin DZM 12 DREH connector diagram

24 pin DZM 12 DREH connector
to the C64 UserPort

Pinouts.ru > Serial interfaces cables and converters schemes listing >  Pinout of Mac to C64 Nullmodem cable and layout of 8 pin mini-DIN male connector and 24 pin DZM 12 DREH connector
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Source(s) of this and additional information: Usenet posting in comp.sys.cbm, A very simple C64 to Macintosh serial cable by Chris Baird 0 reports
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