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Digital CD Audio in DOS games via modified VSBHDA and SHSUCD (Announce)

posted by PCGamingTimeMachine, 26.04.2026, 23:02

> > Did a quick test of this variant with Quake Mission Pack 1 on a real
> > machine with a real CD. It works, AFAICS.
>
> Now I tested the very same game on this same machine, but this time with an
> image file. It worked as well.
>
> I also tried to test this on a P3 machine with 512 MB. With a real CD the
> game crashed immediately; the image variant won't work because the image
> driver wants to allocate 780 MB XMS memory. Perhaps this can be improved a
> bit, because the image is 320 MB only, so in theory it might be possible to
> run on that machine. It's of minor importance, of course, since on such
> machines you can usually just connect the CD drive with the sound card and
> so avoid all this extra work.
Absolutely, I'll add memory to be allocated as a command line flag so maybe that'll help. But I'm more interested in the real CD crash. What game is this? Another thing I should mention is that performance (even stability) depends quite a bit on 3 parameters I have defined in CDAUDIO.H - SHARED_SLOT_SECTORS, AUDIO_BUFFER_SIZE and AUDIO_BUFFER_PREFILL_BYTES. I should also probably add them as cmd flags but for now I've hardcoded them.

That's a possible culprit off the top of my head but if you can let me know which game it was, I'll test it out on my end and see if it works for me

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