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12 pin unspecified connector layout
12 pin unspecified connector
      1  2  3  4  5  6
      =  =  =  =  =  =
     ###### ###########    (At the computer)
      =  =  =  =  =  =
      A  B  C  D  E  F
Pin Description
A or 1  (black) +5v
B or 2  (green) GND
C or 3  (red) Motor (computer controlled +6v for datasette motor)
D or 4  (white) Read line from casette
E or 5  (brown) Write line cassette
F or 6  (blue) Cassette Switch Sense (monitors cassette play/ff/rew buttons)

May be 

A or 1     GND
B or 2     + 5 Volt

According to 5 reports in our database (2 positive and 1 negative) this pinout should be correct.

Is this pinout
Source(s) of this and additional information: Commodore PET FAQ, from Hardware Book
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