> Hello,
> Found this list most interesting and It has inspired me to root
> through my collection of old 386 & 486 motherboards etc.

> I dug out an old baby-AT 386sx25 and fitted a 387sx25 co-pro
> recovered from another junked system. I could configure it in
> the bios but POST and any software say it isnt present.

> I then put the 387 onto another board with 33Mhz clock
> speed...The handbook tels me I need to clock it from an external
> clock and set the jumper to "asyncronous", however it all seems
> to work OK setting it to syncronous, clocking it from the CPU.
> Will the co-pro work reliably in this configuration? Is there
> any software available to test it thogroughly?

> Why didnt it work on the SX25 board? I suspect Ive probably got
> a  faulty board but it works OK in all other respects...

> TIA
> Nick

1.  I suspect you are overclocking the 387 at 33 MHz if it is truly only
rated at 25 MHz.

2.  Have you checked the motherboard manual (or Manufacturer's website)
for a jumper setting?

Boyd Ramsay

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