VOGONS


First post, by 386SX

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Hi,

I've this mobo (with the original box incredible) and was thinking to build a pc with it but I've read that these boards had problems with patches for the K6-2+ cpus and also working up to the rev 1.03 version. Do anyone knows more about it or I only can go up to a usual K6-2 (and what about the original K6-3)?
I've both a K6-2 550, K6-2+ 550, K6-3 400 to try.
Thanks

Reply 2 of 4, by xjas

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K6+es work fine on 1.05/1.06 with a really simple resistor mod. But a 1.04 will run them with no mods.

Be aware the 1.04 has a limit of 128MB cacheable RAM, but this is negated if you use a K6+ or K6-3 (which can cache 4GB.)

twitch.tv/oldskooljay - playing the obscure, forgotten & weird - most Tuesdays & Thursdays @ 6:30 PM PDT. Bonus streams elsewhen!

Reply 3 of 4, by 386SX

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xjas wrote on 2020-04-26, 19:08:

K6+es work fine on 1.05/1.06 with a really simple resistor mod. But a 1.04 will run them with no mods.

Be aware the 1.04 has a limit of 128MB cacheable RAM, but this is negated if you use a K6+ or K6-3 (which can cache 4GB.)

Thanks, I've found the latest bios (official-beta) that should support it (I was expecting a patched bios not official) and need to find a PS2 keyboard I don't have anymore to boot it and flash it.

Reply 4 of 4, by Sphere478

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I have a p5a 1.06 and it seems to work fine with non plus cpus but soon as I pop in a 2+ it refuses to post. I’ve done the mod but no luck.

Any thoughts?

I think I recall someone saying they needed to raise the I/O voltage? Idk,

Edit:,

Nvm, it works now, not sure what was up with it… only thing I really did was plug a fan into cpu fan plug and plug a diag card in. 🤷‍♂️

No idea.

I guess of someone encounters the same problem keep trying

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
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SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)