INT 15 - MultiDOS Plus - UNMAP IRQ
AH = 18h
AL = IRQ to unmap (01h-0Fh)
Return: AX = status
0000h successful
0001h invalid IRQ
Note: results are unpredictable if the IRQ has not been mapped
SeeAlso: AH=19h"MultiDOS"
See Also:1517
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