IBM AT 5170 no longer works with the latest DMA changes

Support and general discussion.
Post Reply
SA1988
Posts: 246
Joined: Wed 30 Apr, 2014 9:38 am

IBM AT 5170 no longer works with the latest DMA changes

Post by SA1988 » Mon 12 Mar, 2018 8:30 pm

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.

User avatar
SarahWalker
Site Admin
Posts: 1722
Joined: Thu 24 Apr, 2014 4:18 pm

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

Post by SarahWalker » Mon 12 Mar, 2018 8:52 pm

Fixed in rev 1104.

Greatpsycho
Posts: 123
Joined: Tue 22 Mar, 2016 10:03 am
Location: Korea
Contact:

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

Post by Greatpsycho » Wed 21 Mar, 2018 12:06 pm

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.
(1.08 KiB) Downloaded 84 times

Post Reply