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From: DAVID1%UCONNVM.bitnet@vm.its.rpi.edu ( Carl David)
Newsgroups: comp.lang.pascal
Subject: Interupt 9 processing
Message-ID: <27307@adm.brl.mil>
Date: 27 Jun 91 17:13:19 GMT
Sender: news@adm.brl.mil
Lines: 23


I have a problem in understanding Interupt 9 handling, which I am doing
in Turbo Pascal, and I wonder if someone with real knowledge about how
it works can help me.
I would like to understand, with emphasis on understanding, what is
happening when a multiple key stroke is being read, for instance,
Ctrl-RightShift-J.
What ends up in the keyboard buffer?
For single keys, I understand what is going on, but for multiple ones I
don't.
Thus, is the address (which I forgot) which holds the status bits for
NumLock, etc., being set when one depresses and releases the Ctrl,
Alt, Shift, etc. keys?
Can I write to those locations so that when a character comes along I
can trick the computer into thinking that the Ctrl (or something else)
key was depressed?
I am creating a cryptogram, such that each letter typed by the user
is substituted from a table in memory, such that to get the computer to
operate the player would need to solve the cryptogram, how would I handle
the multiple keys and uppercase lowercase problems?
Thanks for any help you can give me.
Carl David
DAVID1 at UCONNVM.bitnet