>Does anyone know how to disable the onboard FPU? >johnsn I have never tried it, but, looking at the SE/30 schematic, I see that pin 29 of the FPU is labeled "CS" and the signal line going to it is labeled "FPU*". "CS" would be "Chip Select", and the asterick after the signal name means it's low asserted. So, lifting that chip pin and tying it high thru a resitor would deselect the FPU, thus disable it. But it would be better to do that on the IIsi Nubus adapter's FPU, instead of the mobo. And IIsi Nubus adapter's FPU would have to be verified as being same package as mobo FPU, otherwise CS pin number might be different.
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