You'd better take a picture of the board.

Some info on identifying motherboards with a BIOS string:
http://www.techenclave.com/guides-and-tutoria … bios-66442.html

Or just browse the pix here:

http://stason.org/TULARC/pc/motherboards/

is what I often do. Sad I know, but sometimes I'm even trying to identify something. [j/k]

I found one that matches very well but there are some differences

Iirc there were only a few 486 boards on th99 that had 2 SIMM slots

That chipset can support the 5x86, this is the board I have unfortunately no bios chip http://stason.org/TULARC/pc/motherboards/A/AB … B4-REV-1-2.html

I found the PB4 BIOS here: http://www.motherboards.org/mobot/bios/Abit/PB4/

If you buy some flash EPROM's that fit you might be able to hot flash it in a different board, or use uniflash and flash it in a network card with a boot ROM socket.
I've actually got a couple of flash EPROM's in the mail to attempt this with a couple of my own boards...

Thanks for that Donut I should give it a go although I suspect the board might be dead, it should beep with no bios chip?

Without a BIOS chip, the board will not work at all, not even a beep.

http://www.elhvb.com/mobokive/archive/index.html

In this site there are LOTS of BIOS, manuals,etc. for most of the old mobos

Even the Abit PB4 bios is in there

Sorry for hijacking the thread, how do I know what flash eprom to buy? IE number of pins, size of the chip, ive dont know anything about bios chips.=, and lastly where to buy

Here's a thread I posted on the topic:
Am5x86 on UM8810P

I haven't recieved the chips yet but I'll update with the results when I do.

But without knowing what chip was in there before its hard to tell exactly.
My board had 27C010A BIOS chips, I ordered 28F010A replacements (which are flash programable unlike the old ones) with the same pin count.

dirkmirk wrote:

Sorry for hijacking the thread, how do I know what flash eprom to buy? IE number of pins, size of the chip, ive dont know anything about bios chips.=, and lastly where to buy

You can buy any 128k flash eeprom and use UNIFLASH for flashing; i've flashed 3 mobos with this program and no one was damaged, and if you have dead mobos maybe there is a flash eeprom in there, you need to perform 'hot-flash' to flash this mobo, if you need help, ask me