DOS ain't dead

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.

Complete thread:

• Memory mapped devices from resl mode - Laaca, 26.02.2020, 12:11 (Developers)
  • Memory mapped devices from resl mode - Khusraw, 26.02.2020, 12:35
  • Memory mapped devices from resl mode - RayeR, 27.02.2020, 05:27
    • Memory mapped devices from resl mode - Khusraw, 27.02.2020, 09:07
      • Memory mapped devices from resl mode - Laaca, 04.03.2020, 14:01
        • Memory mapped devices from resl mode - Khusraw, 04.03.2020, 15:02
          • Memory mapped devices from resl mode - Laaca, 04.03.2020, 15:08
            • Memory mapped devices from resl mode - Khusraw, 04.03.2020, 15:23
            • Memory mapped devices from resl mode - Khusraw, 04.03.2020, 15:36
            • Memory mapped devices from resl mode - Khusraw, 04.03.2020, 16:55
              • Memory mapped devices from resl mode - Laaca, 04.03.2020, 18:54
                • Memory mapped devices from resl mode - Khusraw, 04.03.2020, 19:33
    • Memory mapped devices from resl mode - Laaca, 27.02.2020, 17:50
      • Memory mapped devices from resl mode - Khusraw, 27.02.2020, 20:25
        • Memory mapped devices from resl mode - KormaX, 01.03.2020, 22:23
          • Memory mapped devices from resl mode - Zyzzle, 02.03.2020, 06:10
            • Memory mapped devices from resl mode - KormaX, 12.05.2020, 11:21
        • Memory mapped devices from resl mode - marcov, 02.03.2020, 15:43
          • Memory mapped devices from resl mode - Khusraw, 02.03.2020, 19:39
            • Memory mapped devices from resl mode - marcov, 02.03.2020, 23:13
              • Memory mapped devices from real mode - Rugxulo, 03.03.2020, 06:11
                • Memory mapped devices from real mode - marcov, 03.03.2020, 10:12
                  • Memory mapped devices from real mode - Rugxulo, 03.03.2020, 22:12
              • Memory mapped devices from resl mode - Khusraw, 03.03.2020, 13:34