* Executes: C = A + B
*
    xdef start
    xdef A, B, C

start:

    move.l A, d0         Get variable A into register d0
    move.l B, d1         Get variable B into register d1
    add.l  d1, d0        Add them, result is in d0
    move.l d0, C         Store result in variable C
    nop

A:  dc.l 4
B:  dc.l 15
C:  ds.l 1
    end

======================
Run with:
======================
break start
display/wx &C
display/wd &C
display/wx &B
display/wd &B
display/wx &A
display/wd &A
display/x $d1
display/d $d1
display/x $d0
display/d $d0
display/i $pc