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====== Int 31H, AH=02H, AL=01H ======

===== Version =====

0.9

===== Brief =====

Set Real Mode Interrupt Vector

===== Input =====

  AX = 0201H
  BL = interrupt number
  CX:DX = segment:offset of real mode interrupt handler
        
===== Return =====

 Carry flag = clear (this function always succeeds)

===== Notes =====

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 (i.e. below the 1 MB boundary) or the client must allocate a real mode callback address. See Int 31H Functions 0100H and 0303H.

If the interrupt being hooked is a hardware interrupt, the memory that the interrupt handler uses must be locked.

===== See also =====

AX=[[en:docs:dpmi:api:int31:02:05|0205H]], **[[en:docs:dos:api:int21|INT 21H]]**: AH=[[en:docs:dos:api:int21:25|25]]

===== Note =====

Text based on [[http://www.delorie.com/djgpp/doc/dpmi/]]

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