>> Does anyone know how to determine whithin a MPASM macro whether a
>>parameter has been specified?
>
>Hello, Dwayne!
>
>Suggestion: use simple arythmetic to make compiler think it
>performs a smart job :)
>
>test_parm       MACRO             p1
>;
>; Parameter p1 is parsed here as 0 if the value
>; is not supplied to the list.
>;
>        if ( p1+0 ) == 0                ; parser with 0 default value

YES  YES  YES

Thank you, Andrew!  The obvious solution that eluded me for longer than I
care to admit!!  As it turns out, my default and min values default to 00 if
not specified so all I needed to do was add 0 to them.  My current version
looks like this:

label           EQU addr
    org         (EEDEFAULT)+(EECNT)+(EEOFFSET) ;start addr + counter + offset
    retlw       (default+0)

    org         (EELOLIMIT)+(EECNT)+(EEOFFSET)
    retlw       (min+0)

    org         (EEHILIMIT)+(EECNT)+(EEOFFSET)
    if          (max+0)==0
      retlw     0xFF                  ;max limit must be >0
    else
      retlw     max
    endif

MPASM seems to have no problem with a number expressed as (+0) so everything
compiles OK (and generates appropriate code).

Thanks again!

Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, Alberta, CANADA
(403) 489-3199 voice     (403) 487-6397 fax