12 PIN UNKNOWN CONNECTOR at the Computer
      1  2  3  4  5  6
      =  =  =  =  =  =
     ###### ###########    (At the computer)
      =  =  =  =  =  =
      A  B  C  D  E  F
| Pin | Description | 
|---|---|
| A or 1 | GND | 
| B or 2 | +5v | 
| C or 3 | Motor (computer controlled +6v for datasette motor) | 
| D or 4 | Read line from casette | 
| E or 5 | Write line cassette | 
| F or 6 | Cassette Switch Sense (monitors cassette play/ff/rew buttons) | 
Contributor: Joakim Ögren
  Source:
  Commodore PET FAQ
  Copyright © The Hardware Book Team 1996-2001.
  May be copied and redistributed, partially or in whole, as appropriate.
 Document last modified: 2000-07-07