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From: jc58+@andrew.cmu.edu (Johnny J. Chin)
Newsgroups: comp.lang.pascal
Subject: Re: interupt problems
Message-ID: <way5yFi00VY687bLpm@andrew.cmu.edu>
Date: 20 Sep 90 06:20:01 GMT
Organization: Carnegie Mellon, Pittsburgh, PA
Lines: 24

First of all why are you using INT 09h?  INT 09h is generated everytime a key
is pressed.

I suggest that you use INT 16h and look into the keyboard buffer for the next
keystroke.  This way the interrupt routine doesn't have to be reenterant.

If you choose to use INT 09h, then I suggest you use a flag of some sort so
that the interrupt routine knows of a previous keystroke situation has occured.
Simply reserve a byte somewhere in your TSR and refer to it in your routine.
NOTE:  The original INT 09h allows for multiple calls to itself (ie. type-ahead
will cause an INT 09h to occur even if the current procedure running is the
interrupt handler for INT 09h).

I strongly suggest that you look into using INT 16h.  Hope this piece of info.
helps you in your program.
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