>    Andy, the way the Parallax assembler handles this is with an
LCALL/LSET
> pair of instructions. LCALL generates 0-2 BCF/BSF instructions followed
by a
> CALL. LSET then generates 0-2 BCF/BSF instructions to restore PCLATH. If
you
> wanted to, you could use LCALL/LSET everywhere. If you call a routine in
the
> same code page then:
>
>       LCALL   addr
>       LSET    $
>
>    becomes:
>
>       CALL    addr


        Yes, that does look more useful than MPASM's LCALL which was
        what I was describing. The last 16c73 application I wrote ended
        up about 3 1/2 K and I was using MPASM. I started off using LCALLs
        for calls across code pages, but I found out that I was still
        having to handle about half the maintenance of PCLATH myself
        (restoring PCLATH after the return of an LCALL). I also found
        that with a little care and thought I could manage the
        maintenance of PCLATH myself with better results than if I
        just used LCALLs.


- Andy.

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Andrew David, Software Manager, Ultronics Ltd, Cheltenham.
akdavid@Ultronics.co.uk          http:\\www.ultronics.com
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