Commodore PET Parallel User Port

24 PIN UNKNOWN CONNECTOR

                                 1  1  1
      1  2  3  4  5  6  7  8  9  0  1  2
      =  =  =  =  =  =  =  =  =  =  =  =
     ### ######################### ######
      =  =  =  =  =  =  =  =  =  =  =  =
      A  B  C  D  E  F  H  J  K  L  M  N

Pin	Name
1	System Ground
2	TV Video
3	IEEE-SRQ
4	IEEE-EOI
5	Diagnostic Sense
6	Cass.1 Read
7	Cass.2 Read
8	Diag Tape Wrt.
9	TV Vertical
10	TV Horizontal
11	GND
12	GND
A	GND
B	CA1
C	PB0
D	PB1
E	PB2
F	PB3
H	PB4
J	PB5
K	PB6
L	PB7
M	PA2 (CB2)
N	GND

Source: [The Hardware Book]

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