Help me identify and obtain a BIOS for my old 3/486 VL motherboard

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Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby jesolo » 2016-7-21 @ 20:01

The motherboard in this picture comes from the first PC that I bought for myself.

WP_20160721_002.jpg
3/486 VL motherboard

It's a hybrid motherboard that caters for both 386 (including Cyrix DLC's) & 5v 486 CPU's.
However, I'm curious as to who the manufacturer of this motherboard is.
I still have the manual, but there is just a motherboard model number printed on the outside (refer picture below).

WP_20160721_004.jpg
Motherboard manual

No copyright notice or anything else printed inside the manual to indicate who the manufacturer is.
Last edited by jesolo on 2017-11-06 @ 16:01, edited 3 times in total.
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Re: Help me identify my old 3/486 VL motherboard

Postby Jolaes76 » 2016-7-22 @ 04:09

Jetway.
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Re: Help me obtain a BIOS for my old 3/486 VL motherboard

Postby jesolo » 2017-11-06 @ 15:51

I'm bumping this thread of mine since I've had no luck in tracking down the BIOS for this particular motherboard (the current BIOS has died on me).
Since this is a Jetway motherboard, I'm hoping that someone else on here might have a similar Jetway motherboard with an AMI386DX BIOS.
The BIOS ID for Jetway is 1276, which will be the third set of numbers in the BIOS ID on the start up screen.
The AMIBIOS string for this motherboard should be something like this: 40-0802-001276-00101111-080893-OP495XLC-H

If anyone has a similar motherboard, I would appreciate a BIOS dump.
There is no need to remove the BIOS chip - a simple utility called Navratil Software System Information (NSSI) has the ability to dump the motherboard BIOS.
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Re: Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby jesolo » 2017-12-28 @ 17:08

Bump again - looking for anyone with a combo 386/486 motherboard with an OPTI 495XLC chipset that can dump their motherboard BIOS for me.
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Re: Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby gerwin » 2017-12-28 @ 20:56

Maybe this works for you?
http://sannata.ru/bios/486/
OPT495XL.ZIP
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Re: Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby jesolo » 2017-12-28 @ 21:04

Thanks - I think I'm just going to change the vendor ID and try this one.
Theoretically speaking, where you have two similar motherboards with identical chipsets but, manufactured by two different motherboard manufacturers, would their respective BIOS'es work on the other board?
Last edited by jesolo on 2017-12-29 @ 09:00, edited 1 time in total.
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Re: Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby Skyscraper » 2017-12-28 @ 22:18

jesolo wrote:Thanks - I think I'm just going to chance the vendor ID and try this one.
Theoretically speaking, where you have two similar motherboards with identical chipsets but, manufactured by two different motherboard manufacturers, would their respective BIOS'es work on the other board?



With XT clone boards "all" XT clone BIOS versions work.
With 286 boards "most" BIOS versions work even if it isnt for the same exact chipset.
With 386 boards and early 486 boards I find it likely that all or at least most BIOS versions for the same chipset work.

As soon as the boards started to have lots of built in crap the BIOS versions mattered more. But even with some newer chipsets you can sometimes use a BIOS from another vendor. I did it once with a dead nForce4 board to see if it would come to life and it did.
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Re: Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby gerwin » 2017-12-29 @ 00:31

I use UM498F!.ZIP from that place for my 486 motherboard, and it actually works a lot better then the WinBIOS it originally came with. A PnP soundcard works fine with it now, and the Harddisk detection is better.
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Re: Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby feipoa » 2017-12-29 @ 06:51

gerwin: You can use a BIOS intended for the UM498F chipset in motherboards containing the OPTI 495XLC chipset?
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Re: Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby gerwin » 2017-12-29 @ 13:49

No, guess that wasn't clear, but I have only one 486 motherboard and it is UMC 498 based. viewtopic.php?f=25&t=38896
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Re: Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby feipoa » 2017-12-29 @ 21:16

jesolo wrote:Theoretically speaking, where you have two similar motherboards with identical chipsets but, manufactured by two different motherboard manufacturers, would their respective BIOS'es work on the other board?

Usually, yes.
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Re: Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby Jo22 » 2018-1-02 @ 22:27

Hello, I'm currently tidying up and found a few broken mainboards.
By coincidence, one of them does have got a 495 chipset from OPTI, too.

While it's not exactly what you are looking for (495SX instead of 495XLC),
maybe its BIOS is still somehow useful to you ?


By the way, does anybody know a place where someone can "donate" a BIOS ?
- I don't feel comfortable in re-using EPROMs from dead boards before making backups as a precaution.

Every time I get hold of an used EPROM, I feel like there's someone out there who is looking for its content desperately. :depressed:
Especially if its something exotic like, say, an EFAR EC802G-based mainboard (for example; since I'm holding that in my hands right now).

(I apologize if discussing this is not okay. If so, I'd also be happy about feedback via email/pm then.)
Attachments
opti_82c495sx.zip
My personal dump of a 495SX BIOS.
Design of the text file inspired by the ones
found at chukaev(dot)ru54(dot)com
(42.3 KiB) Downloaded 3 times
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Re: Help me identify and obtain a BIOS for my old 3/486 VL motherboard

Postby Moogle! » 2018-1-03 @ 06:25

Skyscraper wrote:
jesolo wrote:Thanks - I think I'm just going to chance the vendor ID and try this one.
Theoretically speaking, where you have two similar motherboards with identical chipsets but, manufactured by two different motherboard manufacturers, would their respective BIOS'es work on the other board?



With XT clone boards "all" XT clone BIOS versions work.
With 286 boards "most" BIOS versions work even if it isnt for the same exact chipset.
With 386 boards and early 486 boards I find it likely that all or at least most BIOS versions for the same chipset work.

As soon as the boards started to have lots of built in crap the BIOS versions mattered more. But even with some newer chipsets you can sometimes use a BIOS from another vendor. I did it once with a dead nForce4 board to see if it would come to life and it did.


Fuggin' post of the year here. I have long wondered if they were inter-changable, and to what extent. I know 486 and on were usually not, assuming different chipsets. I'd like to find a better BIOS for that HP Frankenstein P2B.
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