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The KS does a quick checksum of the ROM on boot and displays RED if the checksum doesn't match. If it only occasionally gives a red screen it could be bad connection either on the ROM socket or the accelerator card / CPU socket. It could be a slow EPROM. They should be at least 120ns but they did make 150ns 27C400 chips. These are too slow but sometimes work. Usually on cold boot they work better than when they have warmed up.
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