ccording to the old parallel port pin standard it was possible to assign pins #2-#9 of a parallel port as either inputs OR outputs, as a block of eight only. Thus if pin #2 was an input then pins #3-#9 were also inputs. The ESS has what amounts to three parallel ports, and this in turn dates back to when everyone used Mach3 and a parallel port. The prospective customers were already with the parallel port numbering and so Warp9 continued that tradition.
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Port one (of the ESS) is output dominated, that is to say pins #2 thru #9 are always outputs, as befit use for Step/Dir signals. Ports 2 and 3 (of the ESS) the pins #2 thru #9 can be assigned as inputs or outputs. The attached pic shows where the setting are found in the ESS Mach4 plugin.
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