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In article <rqjbpINNiqv@matt.ksu.ksu.edu> kentiler@matt.ksu.ksu.edu (Kent Iler) writes:
>Hello,
>   Is there a way to test to see if a key is already pressed.  Let say I run
>this program from the autoexec, and I want to see if the space bar is pressed.
>If it is I want to do one thing, if not I want to do another.  I don't want to
>wait there for a key to be pressed, just see if it already is.  I have C++ and
>Turbo Pascal to program with.  Thanks.
>						--Kent

The wire in front of your keyboard is a communication line.
Each time you depress and release a key, you sent a message to the PC.
Thus, if you don't watch that line, you cannot know the current state
of keys.

There are 2 exceptions : shift/alt/ctrl group and toggle group.
Keyboard routine will remember in 8 bits the state of left-shift, right-shift,
alt or ctrl keys, as well as caps-lock, num-lock, insert and scroll-lock.

So, instead of using space bar, just use other keys, and you are in business!

Check the keyboard BIOS routine to know (in keyboard status routine)
which bit does what.

Reference : Int 16h, function 02, return keyboard flags.


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