Control Emergency Breakout [+] - Husky MP2500 Manual

Description

Control emergency breakout [+]

Entry
Exit
Description
270
Disables or
combination that
computer.
Use this function to prevent a user breaking out of an
application unless they know about the emergency
breakout sequence. (But also see function 23H.)
The other registers must be set as shown for the
function to operate. This should prevent accidental
operation.
AH=23H
AL=control (0=enable, non-0=disable)
BH=7
BL=8
CH=9
CL=10H
DH=11H
DL=12H
AL=0 (success).
If the user presses the X and P keys while turning on,
MP2500 will usually reboot even if it is locked into a
program. This is the emergency breakout mechanism.
Use this function to disable emergency breakout, to
prevent a user breaking out of an application. You
should also use function 22H to prevent use of
Ctrl+Alt+Del.
The other registers must be set as shown for the
function to operate. This should prevent accidental
operation.
re-enables Ctrl-Alt-Del,
usually reboots
H MP2500 System Developer's Guide
USKY
the key
an MS-DOS