Thanks to Roy Walker and Chuck McManis for the help with my 16 bit decrement
problem.

Roy

The instruction  btfss _v       ;#define ALUSTA,3 _v

I am not familiar with this one. From the way you have written your code
I guess it is an overflow flag. I thought the decf instruction only affected
the zero flag?

Chuck

I do need the full 16 bits (shame as your first solution was very neat) so I
ended up using a variation of your second solution. The counter is
decremented once each interrupt and should stop once it reaches zero. ( The
routine will be called continuously by the interrupt so a check for zero is
mandatory) Here's my solution:-

intserv movf    lobyte,w        ;get the low byte
        btfss   status,z        ;check it for zero
        goto    declo           ;its zero so decrement it
        iorwf   hibyte,w        ;or in the high byte
        btfsc   status,z        ;test for zero
        goto    finish          ;both hi and lo zero so no action
        decf    hibyte
declo   decf    lobyte
finish  retfie

Whoops, the comment on line 3 should be 'its not zero etc'

This seems to work but if anyone has a neater sotution ??? :-)

Thanks again

P.S. sorry if you got my last post twice

Nick