> What is happening to TMR0 during the execution of the ISR?

Nothing different.  It keeps going.  The interrupt flag bit is set
whenever timer 0 overflows from 255 to 0.

> I also never heard an answer on...can I enable both TMR0 and PORTB0
> interupts at the same time?

Yes.  They are independent and have different flag and enable bits.


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