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5IVXB Motherboard Difficulty flashing Bios

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First post, by TimWolf

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This motherboard was working with the BIOS it came with. However I wanted to use 168 pin Ram instead of the 72 pin. It was only displaying a quarter of the Ram size. I found somewhere that said a bios update would fix that. So I ripped the original bios using my cheap 853 programmer under Windows XP. So I do have a 128k backup. However when writing the new bios or the old bios back to the chip I am not getting a verifiable write. And attempting to use the BIOS in the motherboard results in the unit trying to post but making a constant rapid beeping but never ends. My diagnostic card displays the code 41 00. As I am a novice at this point I need some advice and direction. This has me baffled.

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Reply 1 of 9, by darry

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If this is your programmer ,

http://www.xeltek-ic.com/english/products/84/521.html

then the observed behaviour is normal.

The datasheet for the flash chip says VPP (programming voltage) is 12v . Your programmer only supports 5V VPP, AFAICT .

https://pdf1.alldatasheet.com/datasheet-pdf/v … 001BX-B120.html

Reply 2 of 9, by TimWolf

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darry wrote on 2022-02-26, 20:37:
If this is your programmer , […]
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If this is your programmer ,

http://www.xeltek-ic.com/english/products/84/521.html

then the observed behaviour is normal.

The datasheet for the flash chip says VPP (programming voltage) is 12v . Your programmer only supports 5V VPP, AFAICT .

https://pdf1.alldatasheet.com/datasheet-pdf/v … 001BX-B120.html

Would it be possible to inject voltage?

Reply 3 of 9, by darry

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TimWolf wrote on 2022-02-26, 22:01:
darry wrote on 2022-02-26, 20:37:
If this is your programmer , […]
Show full quote

If this is your programmer ,

http://www.xeltek-ic.com/english/products/84/521.html

then the observed behaviour is normal.

The datasheet for the flash chip says VPP (programming voltage) is 12v . Your programmer only supports 5V VPP, AFAICT .

https://pdf1.alldatasheet.com/datasheet-pdf/v … 001BX-B120.html

Would it be possible to inject voltage?

I am pretty sure that can be done . I believe that you would need to lift or isolate the VPP pin from the programmer and feed 12v from a something like a bench PSU (AFAIU, ground would need to be at same level (connected to) as whatever powers the programmer. I suggest validating with someone more experienced/ knowledgeable than I am before attempting this .

Two other options :

a) get a flash programmer that handles 12v VPP
b) Get a replacement flash chip that has a similar pinout and specs but can be programmed with 5v VPP (never program it in the motherboard unless said motherboard can be reconfigured to provide 5v VPP).

Reply 5 of 9, by darry

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Nemo1985 wrote on 2022-02-26, 23:44:

Why do not flash the new bios from the mainboard using uniflash?
You wouldn't have any issue with 12 volt in that case.

That would be a great option if the board could be made to boot which, AFAIU, is not currently possible due to the partially corrupted flash chip .

Hot flashing in another board that is 12V VPP capable is yet another option (if another such board is available).

Reply 6 of 9, by Repo Man11

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The BIOS may not be the issue with the RAM: https://web.archive.org/web/20060311211424fw_ … L1/faq.html#q30

"I'd rather be rich than stupid" - Jack Handey

Reply 7 of 9, by Nemo1985

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darry wrote on 2022-02-26, 23:57:
Nemo1985 wrote on 2022-02-26, 23:44:

Why do not flash the new bios from the mainboard using uniflash?
You wouldn't have any issue with 12 volt in that case.

That would be a great option if the board could be made to boot which, AFAIU, is not currently possible due to the partially corrupted flash chip .

Hot flashing in another board that is 12V VPP capable is yet another option (if another such board is available).

Yes that's right, if you have a 486 or a 430fx or cheapo vx chipset it may have a 12volt eeprom.

I do not know if more recent motherboard equipped with 5v eeprom can do 12v honestly.

Another chance could be to use a 5v eeprom if you have any to spare (the motherboard should have a jumper to select the voltage of the eeprom).

Reply 8 of 9, by gdjacobs

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darry wrote on 2022-02-26, 23:57:
Nemo1985 wrote on 2022-02-26, 23:44:

Why do not flash the new bios from the mainboard using uniflash?
You wouldn't have any issue with 12 volt in that case.

That would be a great option if the board could be made to boot which, AFAIU, is not currently possible due to the partially corrupted flash chip .

Hot flashing in another board that is 12V VPP capable is yet another option (if another such board is available).

Verify by doing a lookup on the ROM chip used to boot the board for hot flashing.

All hail the Great Capacitor Brand Finder

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