X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 13 - future domain scsi bios

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INT 13 - Future Domain SCSI BIOS - GET SCSI CONTROLLER INFORMATION
        AH = 18h
        DL = hard drive ID
Return: CF set on error
            AH = status code (see AH=01h)
        CF clear if successful
            AX = 4321h (magic number???)
            BH = number of SCSI drives connected
            BL = SCSI device number for specified drive
            CX = 040Ah (magic number???)
Note:   also sets an internal flag (non-resettable) which prevents some
          controller messages from being displayed and allows writes to
          removable devices
SeeAlso: AH=1Bh"SCSI"

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