Serial interfaces cables and converters scheme  > Apple pinouts
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+5 1+12+A+N GND
RXD+ 8 M RS232 TXD (PA2)
TXD+ 6 B+C RXD (FLAG2+PB0)
    D+E RTS+DTR (PB1+PB2)
8 pin mini-DIN male connector layout
8 pin mini-DIN male connector
at the Macintosh
24 pin DZM 12 DREH connector layout
24 pin DZM 12 DREH connector
at the C64 UserPort
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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
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