On 07/01/2017 11:00 PM, Gene Heskett wrote:
I definitely don't want to get involved in BIOS updates on
somebody else's computer, but you may well be right!
Anyway, instead of the PCIe card, I tried a VERY old PCI
card, and it works perfectly. So, it looks like some crazy
interaction between the BIOS and the NetMos 9900 chip on the
PCIe parport card.
The NEtMos 9805 chip is admittedly pathological, even in the
manufacturer's data sheet.
later PCI chips apparently fixed those bugs. I tried 3
different PCIe parport cards in that HP machine, none of
them worked. I tried another PCI card, which enumerates as
a serial/parallel card in several other systems, the HP
discovered the card, said it was serial only, and was not
able to enumerate it (the lspci -v listing showed no
addresses associated with the card). So, I think the BIOS
in that machine really DOES have problems.
Glad you got it fixed Jon, and now of course you are THE
magician to that machines owner. :) I rather enjoy those
sorts of feelings myself. :)
Yeah, I really DON'T like all this magic! If I had known,
in 2001 when I started the PPMC project, that the biggest
hassle in the whole thing was going to be the vagaries of
different parallel port chips/cards, I would have backed
away from it. I've gone through all sorts of hell with
various motherboard, chip and card problems. The EPP cycle
requires the CPU to go to a wait state until the cycle
completes. I had one that probably had a defect in the
motherboard, where the CPU would not wait for the handshake,
and just roared ahead. No way I could fix that kind of
bug. It settled down for a while with PCI cards, but then
I ran into this issue with the PCIe cards recently. I was
not using the right software sequence to control the port.
But, the REAL issue is, there is no definitive document that
tells how to operate an EPP port! Everybody invents his own
code, and tries it on a few cards, and hopes that it is
right. UGH!!!
Jon
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