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Just tried the latest build of PCem (WX-SDL2) and the IBM AT 5170 no longer works with any configuration I've tried, even a bare bones one, like CGA and IBM VGA.
Fixed in rev 1104.
I've tuned cpu_rom_prefetch_cycles value to when accessing 150ns mask-rom cycles. I think this is probably closer to real machines.
- cpu_rom_prefetch_cycles value tuning patch.
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