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Available on the Commodore C64/C128. Software emulated. The signals does not have true RS232 levels. It's TTL level, and RXD/TXD is inverted. It's just the normal User Port, used as a RS232 port.
24 PIN MALE EDGE (DZM 12 DREH) at the computer.
| Pin |
Name |
RS232 |
Description |
| A |
GND |
GND |
Protective Ground |
| B+C |
FLAG2+PB0 |
RxD |
Receive Data (Must be applied to both pins!) |
| D |
PB1 |
RTS |
Ready To Send |
| E |
PB2 |
DTR |
Data Terminal Ready |
| F |
PB3 |
RI |
Ring Indicator |
| H |
PB4 |
DCD |
Data Carrier Detect |
| K |
PB6 |
CTS |
Clear To Send |
| L |
PB7 |
DSR |
Data Set Ready |
| M |
PA2 |
TxD |
Transmit Data |
| N |
GND |
GND |
Signal Ground |
Source: [The Hardware Book]
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