X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 15 - system - format unit periodic interrupt (ps esdi drives only)

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INT 15 - SYSTEM - FORMAT UNIT PERIODIC INTERRUPT (PS ESDI drives only)
        AH = 0Fh
        AL = phase code
            00h reserved
            01h surface analysis
            02h formatting
Return: CF clear if formatting should continue, set if it should terminate
Note:   called during ESDI drive formatting after each cylinder is completed
SeeAlso: INT 13/AH=1Ah

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