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Copyright 1991 David Jurgens |
INT 21,33 - Get/Set System Values (Ctl-Break/Boot Drive)
AH = 33h
AL = 00 to get Ctrl-Break checking flag
= 01 to set Ctrl-Break checking flag
= 02 to set extended Ctrl-Break checking
= 05 get boot drive (DOS 4.x)
DL = 00 to set Ctrl-Break checking off
= 01 to set Ctrl-Break checking on
= boot drive for subfunction 5; (1=A:, 2=B:, ...)
on return:
DL = 00 Ctrl-Break checking OFF (AL=0 or AL=2)
= 01 Ctrl-Break checking ON (AL=0 or AL=2)
= boot drive number (1-26, A: - Z:) (function 05)
- retrieves DOS Ctrl-Break or extended Ctrl-Break setting which
determines if DOS will check for Ctrl-Break during INT 21 calls
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| Esc or Alt-X to exit |
int 21,33 |
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