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pinout (распиновка)

Mac to C64 Nullmodem 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


8 pin MINI-DIN MALE connector  to the Macintosh
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)

24 pin DZM 12 DREH connector  to the C64 UserPort

Источник: Usenet posting in comp.sys.cbm, A very simple C64 to Macintosh serial cable by Chris Baird

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