X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 13 - fixed disk

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INT 13 - FIXED DISK - READ LONG (XT,AT,XT286,PS)
        AH = 0Ah
        DL = drive ID
        DH = head
        CH = cylinder (bits 8,9 in high bits of CL)
        CL = sector (01h to number of sectors per track for drive)
        ES:BX -> buffer to fill
Return: CF set on error
        AH = status code (see AH=01h)
        AL = number of sectors read
Note:   used for diagnostics only on PS/2 systems
SeeAlso: AH=02h,AH=0Bh

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