X-Hacker.org- Interrupts & Ports

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        DOS Internal - Absolute disk read

        Entry:
          AX = 1508h
          ES:BX -> buffer
          CX = drive number (0=A:)
          SI:DI = starting sector number
          DX = number of sectors to read
        Return:
          CF set on error
            AL = error code (15=invalid drive,21=not ready)

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