Reference and Sources: 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. UNKNOWN CONNECTOR 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 |
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