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→Parallel Port Pin Numbers
Allstar denoted pins pp9 through pp12 are 'Input pins' listed as 'A#' in the parallel port scheme.
Allstar denoted pins pp9 through pp12 are 'Input pins' listed as 'A#' in the parallel port scheme.
Special note: All these pins require 'buffering' by adding a transistor to do the actual switching.
===Special note===
All these pins require 'buffering' by adding a transistor to do the actual switching.
They will not sink much current on their own.
They will not sink much current on their own.
While these port pins vary, most will only sink about 20ma-50ma of current.
While these port pins vary, most will only sink about 20ma-50ma of current.