Help with a 286 Motherboard \ VOGONS

Help with a 286 Motherboard

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First post, by muon

Posted on 2019-01-16, 10:44

muon Offline

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Joined: 2017-09-16, 09:35

Hi !

Recently I've gotten a mainboard like this:

it's the same board that open this thread: Kixs's 286 to the Max

The board is not working properly. I compared the two pictures and I realize it's missing a chip in the right corner. I think it's a clock generator.

Where can I get that chip? and a socket for that?

Any other sugesstions are welcome..

Regards

Reply 1 of 5, by kixs

Posted on 2019-01-16, 10:57

kixs Offline

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Crystal oscillator for 25MHz operation (my board wasn't too happy running at 25MHz):
https://www.ebay.de/itm/50-000-MHz-Metal-Case … or/183602297984

for 20MHz operation:
https://www.ebay.de/itm/40-000-MHz-Metal-Case … or/183607385265

Visit my AmiBay items for sale (updated: 2025-03-14). I also take requests 😉
https://www.amibay.com/members/kixs.977/#sales-threads

Reply 2 of 5, by PTherapist

Posted on 2019-01-16, 11:43

PTherapist Offline

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muon wrote:
The board is not working properly. I compared the two pictures and I realize it's missing a chip in the right corner. I think it […]
Show full quote

The board is not working properly. I compared the two pictures and I realize it's missing a chip in the right corner. I think it's a clock generator.

Where can I get that chip? and a socket for that?

Any other sugesstions are welcome..

Regards

The missing chip is the i287 Math Coprocessor. It's not essential to have one installed.

Last edited by PTherapist on 2019-01-16, 11:46. Edited 1 time in total.

Reply 3 of 5, by muon

Posted on 2019-01-16, 11:44

muon Offline

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Joined: 2017-09-16, 09:35

Thanks a lot kixs

one more question: do you know what kind of socket use those chips?

Reply 4 of 5, by muon

Posted on 2019-01-16, 11:44

muon Offline

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Rank: Member
Posts: 204
Joined: 2017-09-16, 09:35

PTherapist wrote:
muon wrote:
The board is not working properly. I compared the two pictures and I realize it's missing a chip in the right corner. I think it […]
Show full quote

The board is not working properly. I compared the two pictures and I realize it's missing a chip in the right corner. I think it's a clock generator.

Where can I get that chip? and a socket for that?

Any other sugesstions are welcome..

Regards

The missing chip is the i287 Math Coprocessor, it's not essential to have one installed.