Groups > comp.os.msdos.programmer > #4078

Re: initial memory

From	Mateusz Viste <mateusz@xyz.invalid>
Newsgroups	comp.os.msdos.programmer
Subject	Re: initial memory
Date	2021-12-03 09:45 +0100
Organization	. . .
Message-ID	<soclec$tcv$1@gioia.aioe.org> (permalink)
References	<8808cb98-5cfd-444d-87ac-a71ef937f64cn@googlegroups.com> <8mnduvhd2fdw$.33ex4smmmt4t$.dlg@40tude.net> <da470e5b-c79a-4f5d-add7-9d7ea0a313a0n@googlegroups.com>

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2021-12-03 at 00:38 -0800, muta...@gmail.com wrote:
> So for all executables, all of memory is allocated until
> released?

AFAIK this is true only for COM files, where CS=DS=ES=SS.
This mechanism allows for a very easy way DOS can load these programs.
Just allocate a single 64K block, put the COM image there, prefixed
with a PSP, preset CS=DS=ES=SS and point SP to the end of block.
EXE-style loading, in contrast, is *way* more complex.

> Do you think that ideally MSDOS 2.0 should have included
> a call to auto-release extra memory?

There is no reliable way to know how much memory your program needs.
Only you know that.

Mateusz

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initial memory "muta...@gmail.com" <mutazilah@gmail.com> - 2021-12-02 14:07 -0800
  Re: initial memory JJ <jj4public@gmail.com> - 2021-12-03 15:05 +0700
    Re: initial memory "muta...@gmail.com" <mutazilah@gmail.com> - 2021-12-03 00:38 -0800
      Re: initial memory Mateusz Viste <mateusz@xyz.invalid> - 2021-12-03 09:45 +0100
        Re: initial memory "muta...@gmail.com" <mutazilah@gmail.com> - 2021-12-03 01:22 -0800
        Re: initial memory JJ <jj4public@gmail.com> - 2021-12-04 14:00 +0700
          Re: initial memory "R.Wieser" <address@not.available> - 2021-12-04 08:39 +0100
          Re: initial memory Mateusz Viste <mateusz@xyz.invalid> - 2021-12-04 09:35 +0100
            Re: initial memory "R.Wieser" <address@not.available> - 2021-12-04 13:00 +0100
              Re: initial memory Mateusz Viste <mateusz@xyz.invalid> - 2021-12-04 13:12 +0100
                Re: initial memory "R.Wieser" <address@not.available> - 2021-12-04 15:55 +0100
                Re: initial memory Mateusz Viste <mateusz@xyz.invalid> - 2021-12-04 16:30 +0100
                Re: initial memory "R.Wieser" <address@not.available> - 2021-12-04 18:11 +0100
                Re: initial memory Mateusz Viste <mateusz@xyz.invalid> - 2021-12-04 19:04 +0100
                Re: initial memory "R.Wieser" <address@not.available> - 2021-12-04 21:02 +0100
                Re: initial memory "muta...@gmail.com" <mutazilah@gmail.com> - 2021-12-05 15:01 -0800
                Re: initial memory Mateusz Viste <mateusz@xyz.invalid> - 2021-12-06 09:27 +0100
            Re: initial memory JJ <jj4public@gmail.com> - 2021-12-05 14:03 +0700
      Re: initial memory JJ <jj4public@gmail.com> - 2021-12-04 14:01 +0700
        Re: initial memory "muta...@gmail.com" <mutazilah@gmail.com> - 2021-12-04 02:00 -0800
          Re: initial memory JJ <jj4public@gmail.com> - 2021-12-05 14:12 +0700
            Re: initial memory "muta...@gmail.com" <mutazilah@gmail.com> - 2021-12-05 15:02 -0800
              Re: initial memory JJ <jj4public@gmail.com> - 2021-12-06 13:28 +0700
  Re: initial memory "R.Wieser" <address@not.available> - 2021-12-03 11:25 +0100
    Re: initial memory "muta...@gmail.com" <mutazilah@gmail.com> - 2021-12-03 03:18 -0800
      Re: initial memory "R.Wieser" <address@not.available> - 2021-12-03 14:19 +0100
        Re: initial memory "muta...@gmail.com" <mutazilah@gmail.com> - 2021-12-03 11:35 -0800
          Re: initial memory "R.Wieser" <address@not.available> - 2021-12-03 22:30 +0100
            Re: initial memory - SS:SP "R.Wieser" <address@not.available> - 2021-12-06 14:32 +0100
              Re: initial memory - SS:SP "R.Wieser" <address@not.available> - 2021-12-06 14:51 +0100

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