DOS Fn 2eH: Set/Reset Verify Switch

                                                         Compatibility: 1.0+ 
 Expects: AH    2eH
          AL    0 to turn verify OFF
                1 to turn verify ON
          DL    0 (need for DOS 1.x and 2.x only)
 Returns: none
    Info: Selects whether DOS should verify (check the CRC on) each sector
          after it is written to disk.

          This slows down disk write operations, but it ensures maximum
          data integrity.

          DOS Fn 54H returns the current DOS verify status.

   Notes: ■ The Verify flag is a system-global setting.  If you change it,
            you should restore the original value before exiting.

See Also: Fn 54H (get verify
          Disk Drive Functions
          DOS Functions