Special Handling
System Reset
The combination
of
the Alt, Ctrl, and Del keys will result in the
keyboard routine initiating the equivalent of a system reset.
System reset
is
handled within the keyboard routine.
Break
The combination of the Ctrl and Break keys will result in the
keyboard routine signaling interrupt hex lB. Also the extended
characters
(AL
= hex 00,
AH
= hex 00) will be returned.
Pause
The combination of the Ctrl and Num Lock keys will cause the
keyboard interrupt routine to loop, waiting for any key except the
Num Lock key to be pressed. This provides a system-
or
application-transparent method of temporarily suspending list,
print, and so on, and then resuming the operation. The
"unpause"
key
is
thrown away. Pause
is
handled within the
keyboard routine.
Print Screen
The combination of the Shift and PrtSc keys will result in an
interrupt invoking the print screen routine. This routine works in
the alphameric
or
graphics mode, with unrecognizable characters
printing as blanks.
83-Key Keyboard
4-11
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