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Int 16 Fn FA02 U - PC Tools V8+ Vsafe, Vwatch - Get/set Options [v]
AX = FA02h
DX = 5945h
BL = new parameter flags (see below)
Return: CF clear
DI = 4559h
CL = old value of parameter flags
Bitfields for parameter flags:
bit 7 Protect executable files
bit 6 Protect FD boot sector
bit 5 Protect HD boot sector
bit 4 Boot sector viruses
bit 3 Check executable files
bit 2 General write protect
bit 1 Resident
bit 0 HD Low level format
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