This wouldn't be the first thing VirtualBox doesn't implement fully/correctly.
Another notable omission is the "direct" mode of creating sound by writing
values straight to a SoundBlaster-compatible card; VirtualBox only supports DMA
transfer for sound.
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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, June 17th, 2021 at 8:56 AM, Paul Dufresne via Freedos-devel
<freedos-devel@lists.sourceforge.net> wrote:
> DOSEMU2 seems to report itself almost exactly as VirtualBOX, that is:
> VBE 2.0, D1=0:VGA compatible D1=0, D0=1:DAC is fixed with 6 bit by primary
> color
>
> This destroy my hypothesis about games USING VGA Set palette function...
> rather than the VBE one (AL=9... had wrongly written AH=9 in previous mail).
> Because games works fine about palette in DOSEMU2.
>
> So the new hypothesis is: VirtualBox does not handle correctly direct
> manipulation
> of VGA palette registers, although claiming VGA compatibility would suggest
> it should.
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