Searching a manual for jumper settings of Olivetti M4 434S

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Searching a manual for jumper settings of Olivetti M4 434S

Postby Elia1995 » Thu Jul 07, 2016 1:30 am

Hi, I have this epic 486 Socket 3-based Olivetti M4 434S, recently I found a 486DX4-T100 processor and I wanted to upgrade the stock 486SX2 with this one, but I can't find the jumpers to set the voltage from 5v to 3.3v and I can't find a manual for it online nowhere.
Does someone have a manual for this PC ? At least for the motherboard and the jumper settings, I'd love to upgrade it to a DX4, especially because the SX2 doesn't have the FPU.

Thanks :D
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Re: Searching a manual for jumper settings of Olivetti M4 43

Postby Karlsweldt » Thu Jul 07, 2016 5:30 am

That vintage motherboard may not support a DX4-T100 CPU requiring 3.3 volt core.
Consider instead the Intel "Overdrive" DX4 CPU, which is sort of plug-and-play.
Nearest Olivetti model to yours I found does not note support for your desired CPU.
http://stason.org/TULARC/pc/motherboards/m486_7.html
http://stason.org/TULARC/pc/motherboard ... A204X.html
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Re: Searching a manual for jumper settings of Olivetti M4 43

Postby Elia1995 » Thu Jul 07, 2016 2:02 pm

Oh well, at this point is it better to get a DX4 Overdrive as you suggested, or a 5v to 3.3v converter that goes between the socket and the processor ? :-|
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Re: Searching a manual for jumper settings of Olivetti M4 43

Postby Karlsweldt » Thu Jul 07, 2016 3:30 pm

Doubt you would find a socket adapter to change CPU core voltage. That socket 3 motherboard is an antique.. but still viable for some uses. Easy enough to find a DX4/100 "Overdrive" CPU. Check eBay. Ensure the seller lists it as tested and working.
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