+mizapf Posted May 1 Share Posted May 1 Do you have an oscilloscope? Maybe you can try to check bus control lines and especially the READY line. As I said, when READY is stuck to 0, the processor will not process any command, and the power-on behavior would be a black screen with a more or less random sound from the sound generator. This would also happen if the processor sees no ROM or GROM. Quote Link to comment Share on other sites More sharing options...
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