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

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INT 2F - Multiplex - CDROM - GET DRIVE DEVICE LIST
        AX = 1501h
        ES:BX -> buffer to hold drive letter list (5 bytes per drive letter)
Return: buffer filled, for each drive letter
          BYTE  subunit number in driver
          DWORD address of device driver header

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