On 08/27/2018 12:38 PM, Todd Zuercher wrote:
I have a duel port PCIe parallel port card that I am trying to use in an
application, but I'm having a little trouble.
My problem is that I can't seem to use the pins in the control groupe (1,14,16,17) as outputs in
the normal "out" or "in" configurations. When set up as out or in those pins
seem to be dead. If I configure the port in X mode they do work as inputs. I am at a bit of a
loss with what to do. I am afraid that the breakout board I was trying to use might have messed up
the parallel port card, so I'm a little afraid to plug it into a known good working machine.
Well, first thing is to put some LEDs on the outputs and use
a par port test program to see what is going on. Some
boards have several modes (SPP, BiDir, EPP, ECP) that turn
different driver strengths on.
And, probably some of these PCIe clone cards may just not
work completely. I am most involved with EPP mode, and
there certainly are some cards out there that just don't
work. Also, some cards are totally non-standard register
arrangement, and will only work with the maker's Windows
driver supplied on a disc.
Jon
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