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From: efa@iesd.auc.dk (Erik F. Andersen)
Newsgroups: comp.lang.pascal
Subject: Help needed
Message-ID: <EFA.90Oct5133312@student.iesd.auc.dk>
Date: 5 Oct 90 13:33:12 GMT
Sender: news@iesd.auc.dk (UseNet News)
Distribution: comp.lang.pascal
Organization: Mathematics and Computer Science, University of Aalborg
Lines: 14


   I hope anyone will take the time to help me out with some programming       problems I have.

   a) I want to write a resident routine that can intercept the commands       entered from the DOS prompt, and process the command if it is defined in the   routine, or otherwise return controle to COMMAND.COM. What I think I need to   know, is the following:
  
   1) Where in memory does DOS store the string entered?
   2) What interrupt is issued after I hit return?
   3) Maby it is better if my routine is invoked, after COMMAND.COM detects    that the commands entered are not in it's library, and before the error:       COMMAND NOT FOUND is written on the screen! How can I do this  - if it's       possible?

   b) When I in TP (v. 5.0) write sub-routines to certain hardware interrupts, like INT08 to redifine caracters written on to the screen, strange things      start to happen. So far the only way I have been able to do this, is through   assemble-language, where I never have any problems. I have often written       sub-routines in TP to other BIOS-routines, like INT09 and INT 1C, without any  trouble. If anyone think they know, what I am doing wrong, please let me know.


FROM: Erik F. Andersen
      efa@iesd.auc.dk