Re: The different groups and segments of object files

From	Hans-Peter Diettrich <DrDiettrich1@netscape.net>
Newsgroups	comp.compilers
Subject	Re: The different groups and segments of object files
Date	2020-06-26 00:09 +0200
Organization	Compilers Central
Message-ID	<20-06-024@comp.compilers> (permalink)
References	<20-06-004@comp.compilers> <20-06-005@comp.compilers> <20-06-023@comp.compilers>

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Am 25.06.2020 um 22:40 schrieb Hans-Peter Diettrich:

> AFAIR the starting
> segment selector allowed to access at least 512 MB (8 consecutive
> segments). This feature did not allow to break the 4GB total limit, but
> it allowed for contiguous data areas bigger than 64KB.
>
> DoDi
> [Nobody I knew used huge model because it was so very very slow. There
> was no way on 16-bit x86 to access more than 64K at a time without runtime
> segment calculations. -John]

The 16/32 bit address size prefix inverts the default address size, i.e.
allows to use 32 bit addresses and offset registers with 16 bit code.

I used 32 bit offsets in 16 bit code with the Borland compilers,
disassembled the generated machine code. I never used the HUGE model.

DoDi
[Oh, running on a 386, sure, that would have worked. -John]

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The different groups and segments of object files Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.com> - 2020-06-19 23:22 +0800
  Re: The different groups and segments of object files gah4@u.washington.edu - 2020-06-19 14:12 -0700
    Re: The different groups and segments of object files gah4@u.washington.edu - 2020-06-21 01:50 -0700
    Re: The different groups and segments of object files Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2020-06-25 22:41 +0800
    Re: The different groups and segments of object files Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2020-06-25 22:40 +0200
      Re: The different groups and segments of object files Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2020-06-26 00:09 +0200
        Re: The different groups and segments of object files gah4@u.washington.edu - 2020-07-02 00:36 -0700
  Re: The different groups and segments of object files Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2020-06-20 16:01 +0200
    Re: The different groups and segments of object files Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2020-06-25 23:13 +0800
      Re: The different groups and segments of object files Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2020-06-25 22:52 +0200

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