Matt,
Upon further investigation, I see that you do have the ISR at 0x04,
albeit a bit convoluted.  As Mike mentioned, make sure you save w and
status upon entering the ISR and you pop them back to their original
values upon exiting the ISR.  The other thing I found is you are
clearing INTCON bit 3 instead of bit 2 which is really T0IF.  I just
popped your code into the simulator and found it in less than a minute.
You really need to look at the include file and use the assigned names
for the register bits.  It will be a lot less confusing as you get
deeper into bigger blocks of code.

Bill

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