The Magtape Control Task, MAG, provides gives users enhanced control
 over ANSI and unlabeled tapes.

 The following are switches supported by MAG
 
	/BS		Block size for magtape
	/CC		Type of carriage control
	/EOF		Specifies that MTAACP should return IE.EOF
	/EOT		Specifies that MTAACP should return IE.EOT
	/EOV		Specifies that MTAACP should return IE.EOV
	/INITIALIZE 	Specifies the volume label which the tape will
			be initialized
	/POS		Specifies the number of files to spaced
	/RS		Specifies the record size
	/REWIND		Rewind magtape to BOT
 
 Type HELP MAG <switch> for more information on each switch.
 
 
2 BS
  BLOCKSIZE			MAG SET MMnn:/BS=N.
 
	Specifies the number of characters (bytes) per block
	on magtape.  This block size value is used when there
	is no HDR2 label present on ANSI magtape, or when
	no other value was specified on creation.  
 
	For ANSI tapes     18. < BS < N
 
	For NON ANSI tapes 14. < BS < N
 
2 CC
  CARRIAGE CONTROL		MAG SET MMnn:/CC=type
 
       Defines the default carriage control type for magtape.
       This keyword is the only way to specify carriage
       control for unlabeled tapes.  For ANSI tapes, this
       value is only used when either there is no HDR2 
       or HDR2 contains a system identification code other
       than DEC or OS.
 
       CC = NONE
	    LIST
	    FORTRAN
 
 
2 EOF
  End Of File			MAG SET MMnn:/EOF
 
	Causes the ACP to return the I/O Status code IE.EOF
	to the requesting tape.
 
2 EOT
  End Of Tape			MAG SET MMnn:/EOT
 
	Causes the ACP to return the I/O Status code IE.EOT
	to the requesting tape.
 
 
2 EOV
  End Of Volume			MAG SET MMnn:/EOV
 
	Causes the ACP to return the I/O Status code IE.EOV
	to the requesting tape.
 
2 INITIALIZE
  INITIALIZE			MAG SET MMnn:/INITIALIZE=["]volume name["]
 
	This keyword allows you to create a new volume to satisfy
	a request from the ACP for a new output volume for an
	ANSI tape.
 
2 POS
  POSITION			MAG SET MMnn:/POS=N.
 
	The number of files (tape marks) to be spaced over from the
	current position.
 
	0< N. < 23417 (Octal)
2 RS
  RECORD SIZE			MAG SET MMnn:/RS=N.
 
       	The number of characters (bytes) per record for fixed-length
	records on tape.  This value is used for ANSI tapes when
	there is no HDR2 present.
 
	1. < RS < N
 
2 REWIND
  REWIND			MAG SET MMnn:/REWIND
 
      	Rewind the specified magtape to BOT.