| All cables and connectors  Connectors  Computer  Serial I/O| Pinout for:C64 RS232 User Port |  | 
 
 
 Description : Commodore C64 RS232 User Port
 
 Pinout :
 
 
 | Pin | Name | Description |  | A | GND | Signal Ground |  | B+C | PB1 | Receive Data |  | D | PB2 | Ready To Send |  | E | PB3 | Data Terminal Ready |  | F | PB4 | Ring Indicator |  | H | PB5 | Data Carrier Detect |  | K | PB6 | Clear To Send |  | L | PB7 | Data Set Ready |  | M | PA2 | Transmit Data |  | N | GND | Signal Ground | 
 Note : UNKNOWN CONNECTOR at the computer.
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