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From: terra@diku.dk (Morten Welinder)
Newsgroups: comp.lang.pascal,comp.os.msdos.programmer
Subject: Re: Writing a device driver in TP
Message-ID: <1991Jun6.095415.8760@odin.diku.dk>
Date: 6 Jun 91 09:54:15 GMT
References: <1991May29.140429.11384@maytag.waterloo.edu> <1991May30.002543.13967@midway.uchicago.edu>
Sender: terra@rimfaxe.diku.dk
Organization: Department of Computer Science, U of Copenhagen
Lines: 25

valley@gsbsun.uchicago.edu (Doug Dougherty) writes:

>This has nothing to do with the original post, but...

>dmurdoch@watstat.waterloo.edu (Duncan Murdoch) writes:

>> - They [.EXE format device drivers] work in MSDOS, but not PCDOS,
>	because the .EXE loader is part of COMMAND.COM in PCDOS.
>really??? ---------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

My manual says so too! (MSDOS 3.1 technical ref.)


>> - They only work in version 3 or higher.

>That's interesting.  Does this mean that you can't exec() a .EXE file
>directly (from another program) in PC/DOS?  (I.e., that you would have
>to run it via system() ?)
>--

No. It is only a problem when writing device drivers, since they are loaded
before the first instance of command.com.

Morten 'Sally' Welinder
terra@rimfaxe.diku.dk