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Groups > comp.os.msdos.programmer > #628

Re: Changing a DPMI host, but keeping the DOS extender

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On Sat, 26 May 2012 07:03:19 +0100, Rugxulo <rugxulo@gmail.com> wrote:

> Hi,
>
> On May 25, 9:06 pm, Ross Ridge <rri...@csclub.uwaterloo.ca> wrote:
>> Ross Ridge  <rri...@csclub.uwaterloo.ca> wrote:
>>
>> >HDPMI32 saved the VCPI protected mode entry point when it was made
>> >resident and then used it later to enter protected mode when the DOS
>> >extender started.
>>
>> Sorry, the entry point is only used after it switches to protected mode.
>> HDMPI32 just remembers the fact that it dected VCPI when it was loaded
>> and then uses the VCPI function INT 67h, AX=0DE0Ch enter protected mode
>> when the DOS extender starts.
>
> Okay, you're right of course. I forgot all that. But yes, the point
> was to hide VCPI so that DOS/32A wouldn't try using it (and fail) in
> lieu of DPMI (which works).
>
> BTW, apparently there is a cmdline switch to get HDPMI to use VCPI
> even if XMS is detected. So at least some people agree with me that it
> may be advantageous to configure it.
>
> P.S. Under "JEMM386 NOEMS" I ended up having over 64k free UMBs
> anyways, so I ended up switching to EMS by default. Unfortunately, I
> know that some programs want to use more than default "MAX=120", but
> changing it to approx. 512 MB exposed a rare (but vaguely familiar)
> "bug" (?) in CWSDPMI, which I use a fair bit, so I just scrapped the
> whole idea and went back to plain XMS. I really "by default" don't
> need EMS or UMBs at all, so it doesn't matter. If I unload like one or
> two TSRs (SHCDX33E, CTMOUSE), I can get 604 kb free, so that should be
> plenty, even for oddball (bad) programs that need that much (old
> demos??). So I guess it's fairly moot except for curiosity.

I found some olde DOS progs wouldn't believe it if you had over 600k free;  
I had to eatmem 20k to get one to work.

-- 
[dash dash space newline 4line sig]

Albi CNU

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Thread

Changing a DPMI host, but keeping the DOS extender "Rod Pemberton" <do_not_have@notemailntt.cmm> - 2012-05-19 20:08 -0400
  Re: Changing a DPMI host, but keeping the DOS extender Rugxulo <rugxulo@gmail.com> - 2012-05-19 19:07 -0700
    Re: Changing a DPMI host, but keeping the DOS extender "Rod Pemberton" <do_not_have@notemailntt.cmm> - 2012-05-20 05:38 -0400
      Re: Changing a DPMI host, but keeping the DOS extender Rugxulo <rugxulo@gmail.com> - 2012-05-20 09:15 -0700
        Re: Changing a DPMI host, but keeping the DOS extender "Rod Pemberton" <do_not_have@notemailntt.cmm> - 2012-05-20 20:46 -0400
          Re: Changing a DPMI host, but keeping the DOS extender Rugxulo <rugxulo@gmail.com> - 2012-05-21 16:26 -0700
            Re: Changing a DPMI host, but keeping the DOS extender "Rod Pemberton" <do_not_have@notemailntt.cmm> - 2012-05-22 03:39 -0400
              Re: Changing a DPMI host, but keeping the DOS extender Rugxulo <rugxulo@gmail.com> - 2012-05-22 08:41 -0700
                Re: Changing a DPMI host, but keeping the DOS extender Rugxulo <rugxulo@gmail.com> - 2012-05-22 16:14 -0700
                Re: Changing a DPMI host, but keeping the DOS extender "Rod Pemberton" <do_not_have@notemailntt.cmm> - 2012-05-24 15:38 -0400
                Re: Changing a DPMI host, but keeping the DOS extender Rugxulo <rugxulo@gmail.com> - 2012-05-24 14:06 -0700
                Re: Changing a DPMI host, but keeping the DOS extender Ross Ridge <rridge@csclub.uwaterloo.ca> - 2012-05-25 02:14 -0400
                Re: Changing a DPMI host, but keeping the DOS extender Rugxulo <rugxulo@gmail.com> - 2012-05-25 15:55 -0700
                Re: Changing a DPMI host, but keeping the DOS extender Ross Ridge <rridge@csclub.uwaterloo.ca> - 2012-05-25 21:42 -0400
                Re: Changing a DPMI host, but keeping the DOS extender Ross Ridge <rridge@csclub.uwaterloo.ca> - 2012-05-25 22:06 -0400
                Re: Changing a DPMI host, but keeping the DOS extender Rugxulo <rugxulo@gmail.com> - 2012-05-25 23:03 -0700
                Re: Changing a DPMI host, but keeping the DOS extender "Rod Pemberton" <do_not_have@notemailntt.cmm> - 2012-05-26 07:33 -0400
                Re: Changing a DPMI host, but keeping the DOS extender Ross Ridge <rridge@csclub.uwaterloo.ca> - 2012-05-26 20:10 -0400
                Re: Changing a DPMI host, but keeping the DOS extender "Harry Vaderchi" <admin@127.0.0.1> - 2012-05-28 07:38 +0100
  Re: Changing a DPMI host, but keeping the DOS extender Ross Ridge <rridge@csclub.uwaterloo.ca> - 2012-05-20 19:20 -0400

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