DOS/32 Advanced DOS Extender - Programmer's Reference 2.18 - DPMI function 0201h - Set Real Mode Interrupt Vector Sets the current virtual machine's real mode interrupt vector for the specified interrupt.
In: | AX = 0201h BL = interrupt number CX:DX = segment:offset of real mode interrupt handler
Out: | CF clear
Notes: a) The address passed in CX must be a real mode segment address, not a selector. Consequently, the interrupt handler must either reside in DOS memory (ie below the 1 MB boundary) or the client must allocate a real mode callback address. See DPMI functions 0100h and 0303h. b) If the interrupt being hooked is a hardware interrupt, the memory that the interrupt handler uses should be locked. c) DOS/32 Advanced DPMI will temporarily disable the Null-Pointer Protection (if it was enabled) in order to modify the first four interrupt vectors, INTs 00-03h. Copyright © DOS/32 Advanced Team 1996-2002 All Rights Reserved