Viesturs Lācis wrote: > 2011/7/30 gene heskett <[email protected]>: > >> I believe EPP is the magic acronym. >> > > EPP mode is only for communication with external I/O hardware, like Mesa > cards. > Farzin, You should check, if that add-in card supports data input on pins 2-9. > AFAIK not all do. > Pico Systems boards also need the EPP mode. But Viesturs is right, EPP is NOT needed for general purpose I/O for auxiliary control, step pulse output and similar connections. It would be quite surprising if anything with a PCI connection did not support bidirectional mode. It is possible that some oddball brand might not use the standard register layout for controlling the input/output mode selection. It is also possible that some boards, when in EPP mode, may ignore the in/out command bit, so you should set the board for PS/2 (bidir) mode. How to set PCI plug-in boards for a default mode varies by make. Some have an EPROM on the board that can be set by a program (like SIIG).
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