I have one machine which will have an MDA in it, but currently does not. I
just compiled 2.2.17 with usb backport and e2c patches, and said kernel
tells me it has detected an MDA.
The machine is a DEC Celebris XL 5133DP and has an older S3 vedio card in
it. I would happily test with 2.4.0-test kernels save for needing e2c
currently. On the other hand I would rather use hgafb instead.
On Sun, 9 Jul 2000, Matan Ziv-Av wrote:
>
> > > > Hercules Graphics Adapter
> > >
> > > This is not good enough, since there are non-hercules mda cards.
> > > Also, vga cards might emulate that port io aliasing as well.
> >
> > The reliable way to detect an HGA card is to run through the VGA/EGA detect
> > and onlyif VGA/EGA fails then check that the light pen port is changing value
> > as you would expect. The light pen port check is used heavily - clone Herc
> > cards emulate its behaviour even if they dont have one
>
> The system has both vga card and mda card, so the vga test will not
> fail. The light pen ports are not available on mda cards, but only on
> hercules and compatibles.
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