DOS ain't dead

Video BIOS shadowing on modern systems. (Users)

posted by tom , Germany (West), 02.02.2023, 14:24

> Scitech did this "optimizing" VGA and VESA support 25 years ago. I'm
> wondering, for example, if one could "replace" the onboard vBIOS of one
> Intel Graphics (eg, UHD 620) with another (eg, Intel HD5500 series) which
> *does* correct some of the bugs introduced with Onboard UHD 620 Graphics
> (VBE 2.0 errors / black screen at 640x480 and above, lack of 320x240 Mode
> 13, etc).
>
> Any suggestions, pointers or advice on to "shadow" modern Intel vBIOSes
> into lower RAM, for modification?

a more reasonable approach would be to write a TSR that intercepts INT 10h, implements the faulty functions, and bounces everything else to the original INT 10 handler.

Complete thread:

• Video BIOS shadowing on modern systems. - Zyzzle, 02.02.2023, 10:54 (Users)
  • Video BIOS shadowing on modern systems. - tom, 02.02.2023, 14:24
    • Video BIOS shadowing on modern systems. - bretjohn, 02.02.2023, 18:02
      • Video BIOS shadowing on modern systems. - Zyzzle, 03.02.2023, 02:53
        • Video BIOS shadowing on modern systems. - CandyMan, 06.02.2023, 00:26
          • Video BIOS shadowing on modern systems. - bretjohn, 07.02.2023, 15:47
            • Video BIOS shadowing on modern systems. - Zyzzle, 10.02.2023, 05:25
              • Video BIOS shadowing on modern systems. - CandyMan, 10.02.2023, 09:52
                • Video BIOS shadowing on modern systems. - Oso2k, 11.02.2023, 23:54
                  • Video BIOS shadowing on modern systems. - CandyMan, 12.02.2023, 09:24
                    • Video BIOS shadowing on modern systems. - tom, 12.02.2023, 12:00
                • Video BIOS shadowing on modern systems. - Zyzzle, 22.02.2023, 10:24
                  • Video BIOS shadowing on modern systems. - CandyMan, 26.12.2023, 19:48