27C010 can be UV erased if the package has a window. You could get another chip though to be able to swap them.

Ok, looks like I can buy those chips NOS off ebay. Can I hotswap the BIOS chips and program the new one with this board? What should the 5v/12v be set to?

EPROM (27C010) -> Has to be programmed by an external programmer, I wouldn't change the jumper.

Flash -> Do you know which flash chips the mainboard and flashing software, if it exists, support? Then it depends on the chip wether 5V/12V are to be selected.

28F010 needs 12V
29F010 5V or open

I should be able to hotswap with an AM28F010A cip and flash that right?
The flash program that came with the BIOS file is just FLASH36.exe and doesn't have any further info.
But I think uniflash should work with my motherboard and that flash EPROM

Just a bit of a bump... I did manage to get this to work 😀

I bought a G540 USB programmer off ebay, its cheap and nasty but does the job.

The flash EPROMs I ordered never turned up 🙁

But I did find a dead Socket 7 motherboard with a W29C020C flash EPROM on it for a donor.

So the first problem was that the 29C020C is a 2Mbit chip, while the 27C010 that was in the board is only 1Mbit.

That's easily solved by making appending copy of the BIOS binary file to itself with this command:
copy /b 8810w32j.bin + 8810w32j.bin 8810bios.bin

This way, the 1Mbit BIOS can be programmed into the 2MBit chip.

Once that's done and installed in the motherboard, I set the jumpers for 'SL-DX/2/4', with JP29 shorted (this controls the multiplier) and JP31 set to 3-4 to set the voltage. JP34 isn't marked clearly because there's 2 caps right next to it but these jumpers go in the same direction as neighbouring JP29.

Once these are all set, on boot I was greeted with 'AM5x86-133MHz-P75' 😀

Seems to be running great now. THe new BIOS recognises the 5x86 😀

Here's the bios file if somebody happens to come across this and is trying to do the same thing: http://dl.dropbox.com/u/9151127/8810AIO.32J

DonutKing wrote:

Just a bit of a bump... I did manage to get this to work :) […]
Show full quote

Just a bit of a bump... I did manage to get this to work 😀

I bought a G540 USB programmer off ebay, its cheap and nasty but does the job.

The flash EPROMs I ordered never turned up 🙁

But I did find a dead Socket 7 motherboard with a W29C020C flash EPROM on it for a donor.

So the first problem was that the 29C020C is a 2Mbit chip, while the 27C010 that was in the board is only 1Mbit.

That's easily solved by making appending copy of the BIOS binary file to itself with this command:
copy /b 8810w32j.bin + 8810w32j.bin 8810bios.bin

This way, the 1Mbit BIOS can be programmed into the 2MBit chip.

Once that's done and installed in the motherboard, I set the jumpers for 'SL-DX/2/4', with JP29 shorted (this controls the multiplier) and JP31 set to 3-4 to set the voltage. JP34 isn't marked clearly because there's 2 caps right next to it but these jumpers go in the same direction as neighbouring JP29.

Once these are all set, on boot I was greeted with 'AM5x86-133MHz-P75' 😀

Seems to be running great now. THe new BIOS recognises the 5x86 😀

Here's the bios file if somebody happens to come across this and is trying to do the same thing: http://dl.dropbox.com/u/9151127/8810AIO.32J

That's some cool information. Never knew one could use such different BIOS chips

So the first problem was that the 29C020C is a 2Mbit chip, while the 27C010 that was in the board is only 1Mbit. […]
Show full quote

So the first problem was that the 29C020C is a 2Mbit chip, while the 27C010 that was in the board is only 1Mbit.

That's easily solved by making appending copy of the BIOS binary file to itself with this command:
copy /b 8810w32j.bin + 8810w32j.bin 8810bios.bin

This way, the 1Mbit BIOS can be programmed into the 2MBit chip.

I'd have a bad feeling though if the additional address line floats (unconnected input). It can cause the chip to heat up.

I'd have a bad feeling though if the additional address line floats (unconnected input). It can cause the chip to heat up.

Would a better option be to bend the highest address line pin up so its not contacting the socket?

or just use some wire and connect the highest line to the second highest?

First check if it is actually floating on your mainboard, it could be that it already is grounded or your board actually does support the larger type.

DonutKing wrote on 2011-11-19, 13:26:

Just a bit of a bump... I did manage to get this to work :) […]
Show full quote

Just a bit of a bump... I did manage to get this to work 😀

I bought a G540 USB programmer off ebay, its cheap and nasty but does the job.

The flash EPROMs I ordered never turned up 🙁

But I did find a dead Socket 7 motherboard with a W29C020C flash EPROM on it for a donor.

So the first problem was that the 29C020C is a 2Mbit chip, while the 27C010 that was in the board is only 1Mbit.

That's easily solved by making appending copy of the BIOS binary file to itself with this command:
copy /b 8810w32j.bin + 8810w32j.bin 8810bios.bin

This way, the 1Mbit BIOS can be programmed into the 2MBit chip.

Once that's done and installed in the motherboard, I set the jumpers for 'SL-DX/2/4', with JP29 shorted (this controls the multiplier) and JP31 set to 3-4 to set the voltage. JP34 isn't marked clearly because there's 2 caps right next to it but these jumpers go in the same direction as neighbouring JP29.

Once these are all set, on boot I was greeted with 'AM5x86-133MHz-P75' 😀

Seems to be running great now. THe new BIOS recognises the 5x86 😀

Here's the bios file if somebody happens to come across this and is trying to do the same thing: http://dl.dropbox.com/u/9151127/8810AIO.32J

I have the same board and have a broken BIOS chip. Do you still have your BIOS file that was hosted on DropBox? so I can reflash a new chip? Unfortunately the link is down.
And which software did you use to flash the chip?

Timmerman wrote on 2021-08-20, 12:12:

DonutKing wrote on 2011-11-19, 13:26:

Just a bit of a bump... I did manage to get this to work :) […]
Show full quote

Just a bit of a bump... I did manage to get this to work 😀

I bought a G540 USB programmer off ebay, its cheap and nasty but does the job.

The flash EPROMs I ordered never turned up 🙁

But I did find a dead Socket 7 motherboard with a W29C020C flash EPROM on it for a donor.

So the first problem was that the 29C020C is a 2Mbit chip, while the 27C010 that was in the board is only 1Mbit.

That's easily solved by making appending copy of the BIOS binary file to itself with this command:
copy /b 8810w32j.bin + 8810w32j.bin 8810bios.bin

This way, the 1Mbit BIOS can be programmed into the 2MBit chip.

Once that's done and installed in the motherboard, I set the jumpers for 'SL-DX/2/4', with JP29 shorted (this controls the multiplier) and JP31 set to 3-4 to set the voltage. JP34 isn't marked clearly because there's 2 caps right next to it but these jumpers go in the same direction as neighbouring JP29.

Once these are all set, on boot I was greeted with 'AM5x86-133MHz-P75' 😀

Seems to be running great now. THe new BIOS recognises the 5x86 😀

Here's the bios file if somebody happens to come across this and is trying to do the same thing: http://dl.dropbox.com/u/9151127/8810AIO.32J

I have the same board and have a broken BIOS chip. Do you still have your BIOS file that was hosted on DropBox? so I can reflash a new chip? Unfortunately the link is down.
And which software did you use to flash the chip?

I truely hope you find your answer, and with this group you very well might. That being said, I think this situation calls for some xkcd:

"All long help threads should have a sticky globally-editable post at the top saying 'DEAR PEOPLE FROM THE FUTURE: Here's what we've figured out so far ...'"
https://xkcd.com/979/

This isn't exactly the situation here, as a solution once existed. All the same, it reminded me of this!

I truely hope you find your answer, and with this group you very well might. That being said, I think this situation calls for s […]
Show full quote

I truely hope you find your answer, and with this group you very well might. That being said, I think this situation calls for some xkcd:

"All long help threads should have a sticky globally-editable post at the top saying 'DEAR PEOPLE FROM THE FUTURE: Here's what we've figured out so far ...'"
https://xkcd.com/979/

This isn't exactly the situation here, as a solution once existed. All the same, it reminded me of this!

Thanks 😀 That is certainly the case here.
I really hope I can bring this board back to life...

Timmerman wrote on 2021-08-20, 12:43:

I truely hope you find your answer, and with this group you very well might. That being said, I think this situation calls for s […]
Show full quote

I truely hope you find your answer, and with this group you very well might. That being said, I think this situation calls for some xkcd:

"All long help threads should have a sticky globally-editable post at the top saying 'DEAR PEOPLE FROM THE FUTURE: Here's what we've figured out so far ...'"
https://xkcd.com/979/

This isn't exactly the situation here, as a solution once existed. All the same, it reminded me of this!

Thanks 😀 That is certainly the case here.
I really hope I can bring this board back to life...

I'm sorry to report that I don't have a copy of this file any more 🙁 I don't even have that board any more 😒
I've looked around for a while but haven't been able to dig up this file anywhere.

To answer your question about how I burned the ROM, I had a G540 USB programmer that came with software to program the chips. Last time I used this (seveal years ago) it wouldn't work under windows 10.

schlomoe99 wrote on 2021-08-20, 12:26:

I truely hope you find your answer, and with this group you very well might. That being said, I think this situation calls for s […]
Show full quote

I truely hope you find your answer, and with this group you very well might. That being said, I think this situation calls for some xkcd:

Classic xkcd.. heh, even worse though, is when you google a piece of hardware model number, and the single result is you, two decades ago, when you last had it out and asked on a forum about it, no replies 🤣

I'm sorry to report that I don't have a copy of this file any more 🙁 I don't even have that board any more 😒
I've looked around for a while but haven't been able to dig up this file anywhere.

To answer your question about how I burned the ROM, I had a G540 USB programmer that came with software to program the chips. Last time I used this (seveal years ago) it wouldn't work under windows 10.

Thanks for your effort, much appreciated!
Because the G540 doesn't seem to be available anymore I ordered another (cheap) flasher. I also found the BIOS file online it seems.
I will keep you updated on the progress.

Hi guys, I managed to revive the board using a TL866II Plus programmer and the BIOS file I found online.

Timmerman wrote on 2021-08-27, 06:24:

Hi guys, I managed to revive the board using a TL866II Plus programmer and the BIOS file I found online.

Awesome! 👍
Would you care uploading the BIOS file here in case somebody else stumbles across thus thread with the same problem?

Awesome! 👍
Would you care uploading the BIOS file here in case somebody else stumbles across thus thread with the same problem?

Of course, good idea. Here you go.