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Cyrix 686 voltage and pinout?

M

Marty8

Junior Member
I'm building a cheap PC for an 8 year old out of various bits I can scavenge (to replace her 486/25). I know the 686 (pre MMX) is a nasty processor by today's standards, but it's free and it's better than a 486/25!

I have a motherboard (an early Abit AT) but the voltage jumpers do not tie up with the positions they should be in, according to any of the information I have been able to find on the net. If I can find out what voltage the 686 needs and which pin is Vsupply, I can run the motherboard without the CPU and adjust the voltage to suit.

Help appreciated

Marty😀
 
is it a 686L, or just a "686"? THe 686 used the EXACT SAME voltage as a regular pentium - 3.3 volts core, and 3.3 vots I/O.

The 686L used split voltage, like the Pentium mmx. It ran at 2.8 volts.
 
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