INT 2F - TRAP.COM - INSTALLATION CHECK AX = DA55h DL = interrupt number DH = ??? Return: if installed AH = interrupt number AL = ??? ES:BX -> ??? Program: TRAP is an interrupt call tracer by Patrick Phillipot/Udo Chrosziel Note: a separate copy of TRAP is loaded for each interrupt to be traced; thus the interrupt number is part of the installation check