System 7.5.3: incompatible with some SuperMac NuBus cards (4/96)
I have a Quadra 950 with a SuperMac NuBus video card, and ever since I updated to System 7.5 Update 2.0 (System 7.5.3), I can no longer startup in 32-bit mode. Why?
There seems to be some incompatibilities in some of the older SuperMac NuBus cards and System 7.5.3. Contact Radius, which owns SuperMac, for information on workarounds and solutions.