====== ca65 - Dum/Dsect/Dend Macros ======

Several Apple II assemblers have ''DUM''/''DEND'' pseudo-ops that define an originated section of source that will have no code generated.  E.g.:

<code>
        DUM $0 ; zero page references
XLOC    DFB 0
YLOC    DFB 0
WORD    DFW 0
        DEND
</code>

These can be emulated in ca65 with the following:

<code>
.feature org_per_seg

.macro dum addr
  .pushseg
  .bss
  .org addr
.endmacro

.macro dsect
  .pushseg
  .bss
  ; User must supply their own org
.endmacro

.macro dend
  .popseg
.endmacro
</code>

Then the above code can be written in ca65:

<code>
        dum $0 ; zero page references
XLOC:   .byte $00
YLOC:   .byte $00
WORD:   .word $0000
        dend
</code>