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From: tcs@router.jhuapl.edu
Newsgroups: comp.os.msdos.programmer
Subject: Help Generating an Interrupt
Message-ID: <0093F67F.C5AB8C20@router.jhuapl.edu>
Date: 8 Nov 90 17:43:41 GMT
Sender: news@aplcen.apl.jhu.edu (USENET News System)
Reply-To: tcs@router.jhuapl.edu
Organization: Johns Hopkins University/APL
Lines: 27

Hello everyone,

  In reading an old issue of Dr. Dobbs these past few days (I was sick) I 
came upon an undocumented dos call 52h. This is supposed to produce a far 
pointer to a drive table which contains another pointer to another drive 
table which contains the Path followed by a word that contains one of four 
values; Networked drive, Available, Joined or Subst'd. The article (and a 
followup letter) said that you had to place 52h into AH and retrieve the 
far pointer from BS:?? (I think this is correct, but beside the point). 

  The problem I'm having is how to generate that call. Do I generate 52h? 
13h? 21h? or some other interrupt? 

  Information: I'm using TC++ 1.01 and 3.30 IBM PC-Dos on a 386-25. I've 
been working with C for a few years and BASIC before that. I have had very 
very limited instructions on asm but am planning with TAsm. 

  You can E-Mail or respond as I get both. I want to thank you for any 
information you can give me.

  Oh and I looked in Inter590 and (of course) it's not documented! (Gee, I 
never would have guessed :-)

  Thanks again...

Carl Schelin
tcs@router.jhuapl.edu