From: "Matthew Smith" <matt AT the-good-stuff DOT freeserve DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Using AS (GAS) to produce COM files - is it possible?
Date: Sat, 25 Nov 2000 05:16:21 -0000
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References: <8vn57g$rol$1 AT lust DOT ihug DOT co DOT nz>
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

As far as I am aware AS/GAS  is 32 bit only

.COM  files are 16 bit only (again AFAIK)

they are similar to DOS 16 .EXE files but always run at address $100 ( at
least , when dos was still cp/m )

are you compiling to DOS 16 or DOS 32 with NASM?


Fairbairn Family <lgcl01 AT es DOT co DOT nz> wrote in message
news:8vn57g$rol$1 AT lust DOT ihug DOT co DOT nz...
> Hi,
>
> The subject heading says it all.
>
> I use AS as an assembler for Linux, and I am now creating a port of my
> program to DOS and need to assemble some asm code into a MSDOS Com file.
All
> I can figure out is how to output into coff/a.out formats.
>
> At the moment I can't even get a simple "hello world" asm program working
> under DOS.
>
> I have rewritten the code into Intel format and it assembles/executes fine
> when assembled via NASM (so the code should work - ie the system calls are
> available and they do what they are supposed to do) but I would like to
use
> AS if possible to keep all the ports similiar in their requirements.
>
> I've tried various LD / Objcopy commands etc with out success. Could I use
> objcopy with a the "binary" output target to do what I want somehow?
>
> Failing that can someone give me an example asm project which will
assemble
> with AS under DOS?
>
> Thanks,
> Christopher Fairbairn.
>
>