IBM AT 5170 no longer works with the latest DMA changes

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SA1988
Posts: 268
Joined: Wed 30 Apr, 2014 9:38 am

IBM AT 5170 no longer works with the latest DMA changes

Post by SA1988 »

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.
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SarahWalker
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Posts: 1886
Joined: Thu 24 Apr, 2014 4:18 pm

Re: IBM AT 5170 no longer works with the latest DMA changes

Post by SarahWalker »

Fixed in rev 1104.
Greatpsycho
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Re: IBM AT 5170 no longer works with the latest DMA changes

Post by Greatpsycho »

I've tuned cpu_rom_prefetch_cycles value to when accessing 150ns mask-rom cycles. I think this is probably closer to real machines.
Attachments
cpu.c.patch
cpu_rom_prefetch_cycles value tuning patch.
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