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?

Or am I commiting a PIC faux pas by doing such things to the timer?

Or is it just a bug in MPSIM?

Regards,
SJH
Canberra, Australia