A guy brought me an HP elite 8300 desktop machine that he
was having trouble getting working with a stepper controller.
After trying a few things with no result, I put a scope on
the parallel port. What I see is a pulse every 33 ms on pin
1, which is the old parport data strobe. I shut down all
modules such as lp, parport, parport_pc and ppdev, and it is
still doing it. So, some BIOS code or kernel module seems
to be talking to the parallel port card. That is a PCIe
Netmos 9900 chip, which I've used on a bunch of Dell boxes
with no trouble.
Does anybody have any idea what module might be doing this?
(and, how to turn it off)
Thanks,
Jon
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