From mboxrd@z Thu Jan  1 00:00:00 1970
From: Phil Goembel <phil-goembel@wi.rr.com>
Subject: Re: please help this newbie running asm programs!!!
Date: 10 Feb 2003 23:52:24 -0600
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References: <200301301341.h0UDf5Z25323@preshak.recjai.ac.in>
	 <200302060016.28257.a.martone@retepnet.it>
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Would the program start symbol also need to be _main,
or is that only needed by the C runtime library?

Phil

On Wed, 2003-02-05 at 17:16, Alfonso wrote:
> > i am a newbie trying to port and run dos based 8086 programs under
> > linux using as86, ld86 and elksemu. i have written a simple program
> 
> Under ELKS, you should use ELKS system calls (via INT 80h), instead of 
> DOS calls (via INT 21h)...! :-)
> 
> If you want to port some DOS program, you must take into account that 
> almost any program has to be modified and recompiled because:
> 
> - they assume DOS memory structures and interrupts (int 20h, int 21h, 
> PSP, environment variables, etc)... ELKS programs are definitely 
> *clean* with memory, hardware I/O, etc
> 
> - they assume DOS memory handling (i.e.: every program can use all 
> remaining RAM upto 640k)... in ELKS, as in any Unix, a process cannot 
> say "let's get all available RAM";
> 
> - they assume the can do everything with hardware; ELKS programs use 
> the canonical "/dev/..." special files, and do not require special 
> handling; i.e.: a screen terminal, a pipe, a disk file, a serial port, 
> etc, everything uses the canonical open/read/write/close scheme (while 
> DOS world uses a library for soundcard, the open/close for files; BIOS 
> or write to screen-memory for terminal I/O, etc).
> 
> alf
> -
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