Products > Test Equipment
Tektronics TLA704 PCI upgrade
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asp:
Yes. It's the unpopulated connector that is a PCI

-12 and +12 are not mandatory. Actually on the boards that I have tested, the -12 and +12V pins are floating (and I do not have a board that uses either -12 or +12V at hand)

If you populate all the resistors as described in the first post you will get a working PCI (not 100% compliant but working), but the issue with IRQ assignment remains valid as the bios will not assign an IRQ to the board. I have attached some images and you can see the PCI boards connected and detected by the equipment
nctnico:
Did you try a different PCI card? Maybe the BIOS just doesn't recognise this particular PCI card.
asp:
Yes! I have tried 6 different pci-to-usb cards (2 of them are in the pics in the previous post). I have also tried a PCI sound card and a Video capture card and all have the same behavior of not getting IRQs.
Right now I have take down the motherboard and added a socket to it in order to upgrade de cpu to a Pentium MMX 233.
So unless somebody manages to mod the bios and add IRQ assignment, nothing can be done unfortunately!
rfdes:

thanks for the response.

Are you sure there is not another jumper that enables one of the 4 interrupts?  I have heard that it is possible to directly wire the interrupt but I have no hands on experience with this and if it is even possible.  Just something I read once in the past.
It may also be possible to assign an interrupt from within Device Manager. If you haven't already, check the Device Manager application.
asp:
I have checked the board and INT[A:D]# from the PCI slot go directly to the southbridge chip to PIRQ[A:D]# pins. unfortunately the rest of the chips use direct irq adressing having their irq lines routed to irq pins on the southbridge.

My best guess is that the only thing that needs fixing is some register in southbridge initialization sequence (or at least that is what I hope) (PIRQRC[A:D]). That is because by default it seems that PIRQ routing is disabled

I have added a screenshot with the relevant part of the documentation
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