file-spec
      Represents the file specification of the command procedure.   The
      syntax is as follows:

           device:[directory]filename.filetype;version

      You can omit all or some of the fields in the  command  procedure
      file  specification.   PATCH uses the default values listed below
      for omitted fields.

          Field                             Default Value

      device:[directory]    The process's current default device and
                            directory
      filename              The name of input image file
      filetype              .COM
      version               V04-000 greater than the highest
                            command procedure of the same name