The BIT attribute specifies the amount of storage in bits to  be
  received by the object.

  Syntax:

     BIT [[( n )]]

  The optional constant 'n' indicates the number  of  bit  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 BIT attribute.