X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 2f - multiplex - dos 3+ internal

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INT 2F - Multiplex - DOS 3+ internal - FIND UNREFERENCED DISK BUFFER
        AX = 1210h
        DS:DI -> first disk buffer to check
Return: ZF clear if found
            DS:DI -> first unreferenced disk buffer
        ZF set if not found
SeeAlso: AX=120Eh

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