X-Hacker.org- Interrupts & Ports

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        Get allocation table information for specific device (INT 21h, 1Ch)

        Entry:
          AH = 1Ch
          DL = Drive Number to check
        Return:
          DS:BX points to FAT ID byte
          DX = number of allocation units on disk
          AL = number of sectors per allocation unit (cluster)
          CX = number of bytes per sector

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