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CSM BIOS for EFI machines - success! (Announce)

posted by RayeR Homepage, CZ, 01.07.2025, 04:43

A small milestone - Doom can run on UEFI class 3 (legacy free) netbook:
http://rayer.g6.cz/1tmp/csmwdoom.jpg
VGA compatability was a bit improved as SeaBIOS VBE ROM was replaced by original intel Cherry View VBIOS dumped from another UEFI FW. But there are still lot of issues. It shown, that dumped VBIOS contains some HW specific block ($VBT) thats unable to run on built-in netbook LCD but only external LCD via microHDMI. VGA compatability is better but broken another way. Doom lost keyboard control as probably KBD handler gets overwriten by DOS/4GW or Doom one. And any attempt to call VESA VBE cause hang so in this case it's worse than SeaBIOS VBE. But I hope it could be resolved...

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DOS gives me freedom to unlimited HW access.

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