# 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

Contributor: | Joakim Ögren

Source: | Commodore PET FAQ

Copyright © The Hardware Book Team 1996-2004.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-10