John Coppens wrote 2012-08-07 23:27:
> On Tue, 7 Aug 2012 14:08:06 -0700 (PDT)
> Mauricio Giovagnini <maugiovagnini@yahoo.com.ar> wrote:
>
>> My 2 cents here.  It has been a while since I don't code fluently in ass=
embly but If I remember correctly I think he could also use overlay data, s=
o he can place reg1_hdr, reg1_len and reg1_rest starting at the same locati=
on as reg1
>
> Hello Mauricio,
>
> Thanks for the suggestion, but I believe the #define solution is more
> simple.
>
> If I were to use overlays, I probably would have to do the extra work
> of locating the overlay section manually, wouldn't I?
>

You use UDATA_OVR. All UDATA_OVR with the *same name* will have
the same start adress ("overlayed").

Example:

ovr1       udata_ovr
buf1_hdr   res 1
buf1_len   res 1
buf1_rest  res 3

ovr1       udata_ovr
buf1_hdr2  res 2
buf1_len2  res 1
buf1_rest2 res 2

This will create two overlayed definitions of the same
physical 5 bytes in memory.

Then you can have other overlayed sections with other names.

Note, this us MPASM, I do not know if this also works
the same in GPASM.

Jan-Erik.

> John
>
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