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AH = 87h DS:DX = new service routine
Desc: Set the INT 72h vector which is called in 2 cases: - when the machine is about to turn off or reboot, INT 72h is called with AH=0 - when the machine is powering up INT 72h is called with AH=01h
Note: The actual INT 72h vector must also be changed with INT 21/AH=25h
Category: Vendor-specific BIOS Extensions - Int 15h - H
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