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  Interrupt:   15h     Function:   0Fh
 
  Title:       Format ESDI Drive Periodic Interrupt
 
  Description:                                                    [PS/2]
 
     Invoked by the ROM BIOS on the ESDI Fixed Disk Drive Adapter/A
     during a format or surface analysis operation after each cylinder
     is completed.
 
     Input                         Output
 
     AH = 0Fh                      If formatting or analysis should
     AL = Phase code               continue
          0 = Reserved               Carry flag: clear
          1 = Surface analysis
          2 = Formatting           If formatting or analysis should
                                   be terminated
                                     Carry flag: set
                                    -♦-