Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 15h Function 01h
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  Interrupt:   15h     Function:   01h
 
  Title:       Turn Off Cassette Motor
 
  Description:                                                      [PC]
 
     Turns off the motor of the cassette tape drive. This function is
     available only on the PC and the PCjr. It is not supported on the
     PC/XT and all subsequent models.
 
     Input        Output
 
     AH = 01h     If function successful
                    Carry flag: clear
 
                  If function unsuccessful
                    Carry flag: set
                    AH = Status (86h if cassette not present)
                                    -♦-