Does your m/b support 3.3v AMD 486dx2-66 cpus? If memory serves, that's the chip I have. It's buried under a bunch of other junk right now. Lord this...
Certain Compaqs are worth looking at, usually the stuff made before computers became a commodity. That would include the original Portable, Portable...
It's my understanding that (as Chuck(G) pointed out) unless you have an older sound card that requires -5v it's not an issue. AT to ATX adapters are...
I have a somewhat relevant question: older Compaq systems (such as Deskpro286) use a 7.2v battery for backup. It's plugged into a motherboard jumper....