DOS ain't dead

BORLAND DPMI-16bit (Announce)

posted by Rugxulo , Usono, 14.08.2011, 00:13

> > If I use the same RTM + DPMI16BI as GVFM, it doesn't crash or reboot,
> but
> > it still doesn't work for those: runtime 200 error (which Veit's
> R200FIX
> > TSR doesn't help, sadly).
>
> Have you tried PROT200 instead of R200FIX?

No, I didn't try any of the various patch utils, only the aforementioned TSR. Maybe one of those (e.g. PROT200) would work, but I'm skeptical. :-/

> I don't know if they work
> exactly the same way or not, but it might be worth a try. I think there
> may even be a few other programs besides those two specifically designed to
> address the Runtime Error 200.

There are several, but they don't always work.

> Also, the Runtime Error 200 is actually a speed problem (the CPU is too
> fast, which indirectly causes a divide overflow), so a CPU slowdown program
> (like my SLOWDOWN.COM) or possibly even FDAPM with a SPEEDn option might
> help.

True, it's something to do with the timer or delay overflowing a 16-bit value on "fast" (250 Mhz?) cpus, heh, and this one (3200 Mhz) is definitely too fast!

Honestly, for something as heavily patched (and presumably with much 386 internals) as Chasm: The Rift, I have no idea what is needed. I'm not sure it can be run on real hardware. Maybe DOSBox is the only answer. The only reason I even tried was due to the alleged UIDE bug (and admittedly I can't think of a lot of public BP7 programs offhand). I just assume BP7 is buggy because it barely ever works, but perhaps it's just rarely tested anymore. Even DOSEMU (x64) didn't like any of it at all (no surprise, their 16-bit emulation would have to be very precise).

I don't know, what else can we do? Without emulators, we're screwed. We don't have sources (or even necessarily the compiler), so it's pretty much dead if it doesn't work with a little tweaking. I hate that, but that's the way it is.

But what other BP7 apps are people on this forum actively running? It would be nice to know what is considered worth preserving or essential, esp. by fellow DOS-heads.

Complete thread:

• UIDE etc. (July 22) - Rugxulo, 25.07.2011, 21:26 (Announce)
  • UIDE+jemm+VCPI - david, 28.07.2011, 13:34
    • UIDE+jemm+VCPI - Rugxulo, 28.07.2011, 22:38
  • FYI: DEATH (of Jack) - DOS386, 29.07.2011, 09:20
    • FYI: Jack still alive - Japheth, 30.07.2011, 07:57
      • FYI: Jack still alive - DOS386, 30.07.2011, 16:12
    • BORLAND DPMI-16bit - david, 31.07.2011, 18:31
      • BORLAND DPMI-16bit - Japheth, 31.07.2011, 21:09
        • BORLAND DPMI-16bit - david, 02.08.2011, 17:10
          • BORLAND DPMI-16bit - Rugxulo, 13.08.2011, 01:35
            • BORLAND DPMI-16bit - bretjohn, 13.08.2011, 17:30
              • BORLAND DPMI-16bit - Rugxulo, 14.08.2011, 00:13
                • BORLAND DPMI-16bit - Laaca, 14.08.2011, 12:07
                  • BORLAND DPMI-16bit - Khusraw, 14.08.2011, 18:04
                    • BORLAND DPMI-16bit - Rugxulo, 14.08.2011, 18:36
                    • BORLAND DPMI-16bit - Laaca, 16.08.2011, 22:24
                • BORLAND DPMI-16bit - bretjohn, 14.08.2011, 18:48
          • BORLAND DPMI-16bit - a workaround for this issue - Japheth, 15.08.2011, 16:29
            • BORLAND DPMI-16bit - a workaround for this issue - Rugxulo, 15.08.2011, 22:29
              • BORLAND DPMI-16bit - a workaround for this issue - Japheth, 16.08.2011, 03:37
              • BORLAND DPMI-16bit - a workaround for this issue - Rugxulo, 16.08.2011, 07:51