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.
(at
the Computer)
(to
the C64).
8 PIN MINI-DIN MALE to
the Macintosh.
DZM 12 DREH to the C64 UserPort.
|
Mac |
C64 |
|
GND+RXD- |
4+5 |
1+12+A+N |
GND |
RXD+ |
8 |
M |
TXD (PA2) |
TXD+ |
6 |
B+C |
RXD (FLAG2+PB0) |
|
|
D+E |
RTS+DTR (PB1+PB2) |