Mac to C64 Nullmodem
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 to the Macintosh.
DZM 12 DREH to the C64 UserPort.
Note: Larry Anderson suggested that RXD- should not be connected. However earlier information indicated that it should be connected. Please inform us if the above connection is sufficient.
- Usenet posting in comp.sys.cbm, A very simple C64 to Macintosh serial cable by Chris Baird