486 PIO-2 AMD 5x86 Jumper settings \ VOGONS

486 PIO-2 AMD 5x86 Jumper settings

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First post, by appleiiguy

Posted on 2015-02-05, 14:23

appleiiguy Offline

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So I got a 486 PIO-2 and the manuals online dont have any settings for an AMD 5x86 P75.
Currently I have it set for 3.45V, 2x Multiplier, 33 Mhz, and set it to Enhanced AMD 486DX4 (which should set the cpu to WB cache), and I have 512KB of cache installed.

I believe It is the correct setting but since the manual doesnt have the 5x86 setting in it I was hoping someone on Vogons had done this setup before.

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ftp://ftp.fic.com.tw/motherboard/manual/486/4 … 2/486-pio-2.zip <-- The Manual

Reply 1 of 4, by Living

Posted on 2019-11-17, 14:48

Living Offline

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i got the same question

Reply 2 of 4, by jesolo

Posted on 2019-11-17, 16:31

jesolo Offline

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What happens if you boot up the PC?
Does it POST and what does it display on the POST screen?

Reply 3 of 4, by mpe

Posted on 2019-11-17, 18:16

mpe Offline

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The AMD 5x86 P75 is the same thing as Enhanced AMD 486DX4 and needs identical settings.

Or you can use settings for Intel DX4-WB (P24D) which has identical pinout.

https://stason.org/TULARC/pc/motherboards/F/F … -486-PIO-2.html

The only extra thing 133 MHz needs is the 4x multiplier which should be easy to find. If you have a multimeter it is the R17 pin (second pin in bottom right). This pin needs to be set to high to enable 4x multiplier.

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Reply 4 of 4, by zuldan

Posted on 2024-08-14, 07:34

zuldan Offline

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I have this motherboard with the 5x86 P75 CPU. Does anyone have a picture of where this multiplier jumper is so I can set the multiplier from 3x to 4x.

I’ve used a multimeter with pin (R17) on the CPU socket but can’t trace it to any jumpers.

Edit: figured it out. Will post how it’s done in the morning.

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