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Int 60 Fn 05 - Mdebug - Get And Set Mdebug Flags [G]
AH = 05h
DS:SI -> password or a null byte
BL = new value for the semaphor of MDEBUG
00h enable popup of MDEBUG
else disable popup of MDEBUG
Return: AX = return code
FFFEh password is invalid
FFFDh display mode is invalid
else successful
BL = old value of the semaphor of MDEBUG
BH = old value of the INT 08h semaphor
(this semaphor is always reset after this function)
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Written by Dave Pearson