The BYTE attribute specifies the amount of storage in  bytes  to
  be received by the object.

  Syntax:

     BYTE [[( n )]]

  The optional constant 'n' indicates the number of  byte  storage
  units.  It must denote a positive integer.  If you omit 'n', the
  default value is 1.

  See the "HP Pascal Language Reference Manual" for  the  complete
  description of using the BYTE attribute.