DOS ain't dead - Memory mapped devices from real mode

Memory mapped devices from real mode (Developers)

posted by Rugxulo , Usono, 03.03.2020, 22:12

> > AFAIK, nearptr stuff (and CWSDPR0) originally were used for Quake 1
> > back in 1996.
>
> That's probably near the date of the move of v1 to v2 of FPC. But afaik dos
> mostly access the first mb via %fs.

DJGPP 2.00 was released in 1996. It went "DPMI only" (since that's standard across Windows 3.x / NT, OS/2 2.1, Novell DOS 7) instead of always needing its own separate extender (GO32.EXE) with various kludges for whatever else (VCPI is ring 0, 386+ only and atop EMS). So even Quake came with standalone CWSDPMI r1 (!), only needed if no other DPMI host available, although Quake also needed some workarounds for buggy Win95.

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Complete thread:

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