VSI Pascal provides  another  extended  integer  convention  for
  compatibility  with  previous  versions  of  the language.  This
  notation specifies an integer in either binary (base  2),  octal
  (base 8), or hexadecimal (base 16) notation.

  Syntax:
                   b
     [[ + | - ]] % o [[']]extended-digit[[']]
                   x

  The 'b', 'o', or 'x' specifies  binary,  octal,  or  hexidecimal
  notation, respectively.

  The 'extended-digit' specifies the notation that is  appropriate
  for the specified base.

  The following are extended integer  values  in  the  VSI  Pascal
  specific notation:

     %b'1000 0011'
     %O'7712'
    -%x'DEC'