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AX = DA99h CL = subfunction 00h check if ??? 01h set ??? flag 02h clear ??? flag
Return:
CF clear if successful AH = ??? (00h,01h) AL = 00h CF set on error AH = error code (86h unsupported subfunction)
Note: The flag is stored in bit 0 of CMOS RAM location 2Ch for BIOS v1.00.05.AX1
Category: Uncatagorized - Int 15h - A
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