Bob - thanks for the answer.
Any thoughts on the value of 'fudge'?
Is it empirical or should I be able to explicitly calculate it?

> fudge = ...number to account for instructions timer is turned off...
> magic_value = D'65536'-D'5000'+fudge
>
>     bcf        T1CON,TMR1ON    ; turn off timer
>     movlw   low(magic_value)
>     addwf   TMR1L,F
>     btfsc     STATUS,C
>     incf       TMR1H,F
>     movlw   high(magic_value)
>     addwf   TMR1H,F
>     bsf        T1CON,TMR1ON    ; turn it back on
>

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