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Karlsweldt wrote:Some of those jumpers configure the cache type and amount, others the core and I/O voltage, bus speed and multiplier.. as well if the CPU is an "SX" or "DX" type. The suggestion by evasive to use a plain DX33 type may show some life signs.
There are hundreds of old 486 mobo models listed on eBay.. but nothing close to this one in design. That single slot is the crossover ISA/VESA design. Dell, AST and other brands had similar boards, but not the same layout as yours.
Without a pinout diagram, it will be frustrating to "trace" the circuits.. so here is a link for the 486 CPU pinout.. with functions! http://pclinks.xtreemhost.com/486pin.htm
8bitbubsy wrote:Newer Socket 3 slots supposedly have auto-sense 5v/3.3v, so just measuring the VCC pins is nonsense, a different result occurs when you insert an actual CPU in the slot. I could try to short the sensing pins to force either 5v or 3.3v, but that would be meaningless, wouldn't it..
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