On 07/01/2017 05:50 PM, Jon Elson wrote:
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)
Actually, I counted wrong, it is pins 14 and 17, which are
the EPP datastrobe and addrstrobe pins.
Jon
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