X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 15 - system

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INT 15 - SYSTEM - PROGRAMMABLE OPTION SELECT (PS50+)
        AH = C4h
        AL = 00h return base POS register address
             01h enable slot
                 BL = slot number
             02h enable adapter
Return: CF set on error
        DX = base POS register address (if function 00h)

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