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First post, by Baoran

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I found untested 486 motherboard for sale. Do you recognize what model motherboard this is?
Also I would appreciate if you would give me some advice how much it would be worth paying for.

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Reply 1 of 16, by Skyscraper

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Perhpas CHAINTECH 486SLB ?

Main PC: Dual Xeon X5690@4.6ghz, Evga - SR-2, 48gb memory, Intel X25-M g2 SSD and a Nvidia GTX 980 ti.
Retro PC #3: K6-2 450@500mhz, PC-Chips m577, 256mb sdram, AWE64 and a Voodoo Banshee.

Reply 2 of 16, by Baoran

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This is the only picture of chaintech 486SLB I was able to find online and it looks different.

http://pcrebuilding.altervista.org/images/res … fa_p1140336.jpg

Reply 3 of 16, by jheronimus

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It's a Chaintech 486SLB, but their part numbers don't seem to mean a whole lot. I've written about a 486SLP, a slightly more advanced model here. Yours is based on the same chipset and socket, doesn't support 3.45v CPUs (no VRM installed), only has two 72-pin RAM slots and can likely use a lot of cache RAM. It is probably identical to 4SLB, so you take a look at settings here .

Long story short: if this board is anything like mine, it should probably be OK for those who have at least some experience with 486 boards, but it's definitely not a great choice for beginners. It really gave me a lot of issues. Personally, I would look for something easily identifiable and with better documentation.

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Reply 5 of 16, by Predator99

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I think the price is OK. I see some green residues inside the keyboard connector, but other areas does not seem to be corroded. If its not running you still have some spare parts ,-)

Reply 7 of 16, by Baoran

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It probably has not been stored in a very good place considering how corroded that one screw is that is still in one of the holes of the motherboard.
I suppose the main question is if it is still worth trying to rescue. I don't know if it is considered a good 486 motherboard or if it just a motherboard which are common and easy to find in better condition.

Reply 8 of 16, by Predator99

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Buy it...try to get a better price mentioning the corrsoion on screw and keyboard. If the board is not running you get a not very common CPU (never seen it actually?), Cache, Ram, Keyboard controller and Bios...

Jumper settings are described on the board, this is not an issue. You will not get much more info from a manual.

Reply 9 of 16, by Baoran

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I offered him $12 + $8 while expecting him not to accept and it was a big surprise that the seller accepted the offer. I hope it isn't a bad sign that the motherboard is even worse than it looks.
Edit: I have to admit that cpu looks strange.

Reply 11 of 16, by kixs

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I don't find the CPU anything special. It's renamed Cyrix 486, runs at 5V and is about 5% slower then AMD or Intel on the same clock. Although it is a bit rare one.

Too bad the underside of the board isn't shown. But usually these work in about 85% of the time. Just make sure the memory is correct type (FPM) and in correct slot if it won't boot.

My Amibay: SALE | BUY - Updated on 2020-05-25

Reply 12 of 16, by Baoran

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Can you use different 486 cpu on this motherboard that uses different FSB speed? I would actually want to replace the cpu with 33Mhz intel one if the motherboard works.

Reply 14 of 16, by Baoran

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c0keb0ttle wrote:

I think it looks like a Mylix MGI486.

http://th99.classic-computing.de/src/m/M-O/32502.htm

It is close except that boards seems bit bigger and some of the jumpers are missing from my pictures.

Reply 15 of 16, by Baoran

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I just received the motherboard and took another picture of it.

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It has some bent pins, but I have not found any that seem broken yet. The keyboard connector is bit corroded and I think the memory module is 4Mb. Battery is dead but doesn't seem like it has leaked much. The motherboard has alot of jumpers. I wonder if there is some kind of manual for those online somewhere.