ABS              Absolute value

    ABS is a data type specifier which is used to declare a symbol that's
    defined in its original module with the = directive, in other words,
    a symbol that is simply a name for a constant value and is not
    associated with a code or data address.

    ABS used in a GLOBAL statement can resolve symbol references that
    would otherwise result in an 'Illegal forward reference' error or an
    'Insufficient code generation' warning.

    Example:    ; File globals.ash
                dataseg
                array_size = 200
                global  string_len      :ABS
                global  eof             :ABS
                global  carray          :WORD:array_size

                ; File globdata.asm
                model   small
                include ".\globals.ash"
                dataseg
                astring db      "A string"
                string_len =    $ - astring
                eof     =       1ah
                carray  dw      array_size DUP ("CC")

    Example:    EXTRN ysize:ABS