OK, this seems embarassingly simple, but...
For midrange PIC (16F877), I write:
    movlw    0
    call        getvalue
    ...
getvalue:
    addwf    PCL, F
    retlw      B'10100000'
    ...etc.

All code is within page 0 (< 2048 bytes).  Single step thru, upon exec =
the 'addwf' the simulator says W=3D0, but the retlw isn't executed... =
control jumps off into middle of some other code.
I'd swear I've used this construction before, but this isn't flyin'!  =
Any ideas?   Thanks!
Jim

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