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AST RESEARCH TECHNICAL BULLETIN TB-0050 10-24-84
DIAGNOSTIC TESTING OF THE PARALLEL PORT
In order to perform a thorough test of AST's parallel port (when
running IBM diagnostics) you need to provide the incoming signals
to the port. This may be accomplished by constructing a wrap
plug and installing it on the parallel port connector. To
construct a wrap plug use a DB25 male connector. Utilizing a
minimum of 30AWG wire make connections as listed below:
1 > 13
2 > 15
10 > 16
11 > 17
12 > 14