Just tried with a Performa 575 ROM as per Ken's details but the same thing happened. This must be an 060 thing. I did try turning of caches as detailed in the Shapeshifter documentation but this made no difference. Is there any way to fully degrade the 060 to an 040 temporarily? If not then I suppose I *could* put the original 030 back in my A4000 just to prove once and for all whether it's the CPU which is causing the problem.
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moto