286 Rev to 486 not working \ VOGONS

286 Rev to 486 not working

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First post, by Turboman

Posted on 2021-02-12, 02:30

Turboman Offline

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Will a 286 upgrade CPU Rev to 486 work in any 286 motherboard? Does it matter what speed the motherboard oscillator is?

Reply 1 of 4, by douglar

Posted on 2021-02-12, 03:49

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The bios and chipset have some say in the compatibility. The oscillator will determine the base speed of the chip.

Reply 2 of 4, by Turboman

Posted on 2021-02-12, 13:58

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This one has the IBM486SLC2 and it has it's own oscillator I was reading that it should work independently of the motherboards oscillator?

Reply 3 of 4, by megatron-uk

Posted on 2021-02-12, 14:59

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What model of upgrade card is it? Some of them (especially the IBM modules) will only work on the board they were designed for. I have a 486SLC2 here that is for an IBM 50z and it won't work on anything else I've tried it on - regardless of clock fitted to the motherboard.

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Reply 4 of 4, by Turboman

Posted on 2021-02-12, 18:58

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Here is what it looks like. I don't have a co-processor in mine. There are no jumpers or switchs. 50MHZ oscillator.

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