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

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INT 13 - FIXED DISK - CONTROLLER RAM DIAGNOSTIC (XT,PS)
        AH = 12h
Return: CF set on error
        AH = status code (see AH=01h)
Note:   used for diagnostics only on PS/2 systems
SeeAlso: AH=13h,AH=14h

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