>         movlw B'00000101'    ;  TMR0 assigned to incr. on internal clk
>         MOVWF OPTION_REG     ;  W inserted into OPTION register

BTW, one other thing I find useful

When addressing bits, especially in a control register where those
bits will be significant to the operation of the s/w, I include something
like this (lines up in MPLAB courier)

     movlw b'00000101'

;            0                PortB pull-ups enabled
;             0
;              0              internal TMR0 source
;               0
;                0            pre-scaler -> TMR0
;
;                 1           101 = /64 pre-scaler
;                  0
;                   1

It's the sort of feed-back you need when bug hunting

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics