I wrote

isr_exit     bcf   intcon,2    ; Clear interrupt bit  *** bcf intcon,t0ie
***

Should be bcf intcon,t0if, not t0ie

You can re-define SFR bits with names that are more appropriate
for a particular program, which may help debugging. It will make
the program more readable, but you have to consider portability
to other PICs sometimes

For example, say you are counting something like mains cycles
on portb,0 using INT. Which is intcon,1 / intcon,intf

#define mains_cycle intcon,intf ;or whatever name you choose

   btfss mains_cycle

eg if polling (interrupts disabled - you could also test portb,0 itself)
or flag testing in an ISR that could be entered via more than one source


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