DOS ain't dead

> > Recently I realized that in Windows XP any DOS program that tries to use
> > graphics (320x200) or sound (Sound Blaster) freezes (and both are tested
> > independently.) Those programs used to work (e.g. Quick View, VGA Paint,
> > etc) I wonder if anyone know if perhaps any recent updates might have
> > caused this or this is a symptom of damaged NTVDM?
>
> The graphics issue maybe caused by VIDEOPRT.SYS that needs to be patched
> (sometimes it happen that some update will replace back original version)
> I mention it here
> http://www.rayer.g6.cz/hardware/gf7600gs.htm, there's link to
> http://www.rayer.g6.cz/download/videoprt.zip
>
> For sound try vmdsound or soundfx.
Thanks for the quick replies. Actually those programs *used* to work for me under XP (albeit with lousy sound and no VESA support) just a few weeks ago. They also work in a pure DOS boot. However, recently I noticed programs crashing when they should not, *even* with VDMS they seem to crash. I wonder what it could be?

> > Recently I realized that in Windows XP any DOS program that tries to use
> > graphics (320x200) or sound (Sound Blaster) freezes (and both are tested
> > independently.) Those programs used to work (e.g. Quick View, VGA Paint,
> > etc) I wonder if anyone know if perhaps any recent updates might have
> > caused this or this is a symptom of damaged NTVDM?
>
> The graphics issue maybe caused by VIDEOPRT.SYS that needs to be patched
> (sometimes it happen that some update will replace back original version)
> I mention it here
> http://www.rayer.g6.cz/hardware/gf7600gs.htm, there's link to
> http://www.rayer.g6.cz/download/videoprt.zip
>

Could you please elaborate this a bit more? Is this file for specific video card or NTVDM?

> The graphics issue maybe caused by VIDEOPRT.SYS that needs to be patched
> (sometimes it happen that some update will replace back original version)
> I mention it here
> http://www.rayer.g6.cz/hardware/gf7600gs.htm, there's link to
> http://www.rayer.g6.cz/download/videoprt.zip

Does this patch still work for SP3?

Because my current VIDEOPRT.SYS has 120 exports, nor just 115:

start of file lnk.c:


#pragma comment(linker,"/export:...=vidprt0.VideoPortInterlockedDecrement,@1")
#pragma comment(linker,"/export:...=vidprt0.VideoPortInterlockedExchange,@2")
#pragma comment(linker,"/export:...=vidprt0.VideoPortInterlockedIncrement,@3")
#pragma comment(linker,"/export:...=vidprt0.VideoPortAcquireDeviceLock,@4")
#pragma comment(linker,"/export:...=vidprt0.VideoPortAcquireSpinLock,@5")


exports of current VIDEOPRT.SYS:


101A8     1       12AE VideoPortInterlockedDecrement
101AC     2       1296 VideoPortInterlockedExchange
101B0     3       12A0 VideoPortInterlockedIncrement
101B4     4       18E6 PortNotification
101B8     5       901E VideoPortAcquireDeviceLock


As you can see, there has been a new export inserted at #4.

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MS-DOS forever!