Nullmodem Mac to C64

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The RS-232 standard on the C64 is a little bit strange. It uses inverted TTL level for the 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.

8 PIN MINI-DIN MALE 8 PIN MINI-DIN MALE to the Macintosh

DZM 12 DREH to the C64 UserPort

Mac C64
GND+RXD- 4+5
RXD+ 8
TXD+ 6

References

Category:Serial Cables

 

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