On Sunday 02 July 2017 13:50:06 Jon Elson wrote: > 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
I've done some googlesnooping on that very faint trail myself, a fair amount of time back though, and came up just as empty. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
