| All cables and connectors  Connectors  Computer  Video| Pinout for:C64 RS232 User Port |  | 
 
 
 Description : 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.
 
 Pinout :
 
 
 | Pin | Name | Description |  | A | GND | Protective Ground |  | B+C | FLAG2+PB0 | Receive Data (Must be applied to both pins!) |  | D | PB1 | Ready To Send |  | E | PB2 | Data Terminal Ready |  | F | PB3 | Ring Indicator |  | H | PB4 | Data Carrier Detect |  | K | PB6 | Clear To Send |  | L | PB7 | Data Set Ready |  | M | PA2 | Transmit Data |  | N | GND | Signal Ground | 
 Note : C64 RS232 User Port
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