> I am using a 16C84 at 4MHz using TMR0 to generate interrupts every
> 100 cycles = 100us.  This is done by 'bumping the clock forward' in
> the interrupt service routine.  This is the code which works in the
> simulator (MPSIM):
>
> CYCLES  equ     100
>         ...
>         movlw   258-CYCLES
>         addwf   TMR0,f
>
> This is the code which works in the real device:
>
> CYCLES  equ     100
>         ...
>         movlw   259-CYCLES
>         addwf   TMR0,f
>
> Note the 258 for the simulator and 259 for the device, implying the
> device is _slower_ than the simulator.
>
> Now the question:  Am I coming up against one of those limitations
> of the simulator related to simulating events on cycle boundaries
> rather than Tosc boundaries?