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Int 16 Fn FFA3 U - PC Tools V9 Dsklight - Installation Check [-]
AX = FFA3h
BX = FFA3h
CX = FFA3h
Return: BX = CX = 5555h if installed
AX = resident code segment
Program: DSKLIGHT is a TSR included with PC Tools v9+ which displays a disk-
access indicator on the screen; in v7 and v8, this function was
provided by DATAMON
Note: DSKLIGHT chains to the previous handler if BX or CX is not FFA3h
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