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AH = 79h AL = subfunction 01h set ??? flagReturn:
AX = previous state (0000h already set, 0001h clear) 02h clear ??? flag (refer to subfunc 01h)Return:
AX = 0001h 03h set ??? flag (different from subfn 02h or 04h)Return:
AX = 0001h 04h clear ??? flag (different from subfn 02h or 03h)Return:
AX = 0001h elseReturn:
AX = FFFFh (invalid subfunction)
See Also: AH=77h - AH=78h - AH=7Ah - AH=7Ch
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