Motherboard Identification?? \ VOGONS

Motherboard Identification??

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First post, by tinnov

Posted on 2023-09-24, 03:17

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I found this motherboard in a scrap bin, and it's in generally good condition with two caveats... First, it has a botched RTC removal attempt. It doesn't look too bad and I can fix that up no problem (will add a proper socket). Second, it's been completely stripped of everything that could be removed; not even a single jumper remains... Including the BIOS chip. Now I'm sure I can find a blank replacement BIOS chip, but finding the right BIOS image to load onto it may be tricky... But that's putting the cart before the horse. Can anyone here help me identify the board, so I can save it??

Reply 1 of 5, by jakethompson1

Posted on 2023-09-24, 03:24

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Shuttle HOT-433 but there are few variants of them

Reply 2 of 5, by Horun

Posted on 2023-09-24, 03:35

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Agree ! One of the ver 1 to 3, the version 4 has a diff layout....https://theretroweb.com/motherboards/s/shuttl … ot-433-ver.-1-3
added: they are getting a bit rare so it may be worth some time to try to get it working, but don't get your hopes up that all you need is a bios and some jumpers....am sure there is more to it.
Do you have a ISA Diag card ? you will need one.....;p

Last edited by Horun on 2023-09-24, 03:43. Edited 1 time in total.

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

Reply 3 of 5, by jakethompson1

Posted on 2023-09-24, 03:43

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When you select a BIOS chip, be aware that these ISA Plug and Play BIOS boards rewrite a part of the chip on boot if the ESCD has changed. Some BIOSes gracefully fail and boot anyway if the chip is wrong but others do not. For example on my similar MB-8433UUD-A, the modern and cheap SST39SF010A from DigiKey causes it to lock up on boot, but a "period-correct" PH29EE010 from ebay works. It's something to do both with ID numbers of the chip not being known to the BIOS and how granular the BIOS can reprogram them.

Reply 4 of 5, by Horun

Posted on 2023-09-24, 03:51

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jakethompson1 wrote on 2023-09-24, 03:43:

When you select a BIOS chip, be aware that these ISA Plug and Play BIOS boards rewrite a part of the chip on boot if the ESCD has changed. Some BIOSes gracefully fail and boot anyway if the chip is wrong but others do not. For example on my similar MB-8433UUD-A, the modern and cheap SST39SF010A from DigiKey causes it to lock up on boot, but a "period-correct" PH29EE010 from ebay works. It's something to do both with ID numbers of the chip not being known to the BIOS and how granular the BIOS can reprogram them.

Oh yes ! good point, luckily it says the bios chip in silkscreen. 27c010A? but the picture at TRW from Predator99 shows a ST 27c1001. So at least you have two possibles....
I would try this BIOS first: Re: 80486 BIOS image collection it is 95c-123, yours says 95c-127 but that is a start point...

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

Reply 5 of 5, by tinnov

Posted on 2023-09-24, 06:30

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Thanks everyone! I really appreciate the help. I'll keep y'all posted on my repair progress!

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