WIP: Implement IRQ
implement a callback mechanism which trigger the CPU cycles

use it for IRQ
add "target CPU burst loops" to GUI config
merge code
put "max_run_time" also in the config GUI
see that's running
align text to the left

Thanks BlackJack: http://www.python-
forum.de/viewtopic.php?f=18&t=34665&p=263923#p263923
update CoCo2b to newer API
log TIMER read/write
add more comments into PIA

activate debugging for PIA / IRQ
WIP: Implement IRQ
implement a callback mechanism which trigger the CPU cycles

use it for IRQ
add "target CPU burst loops" to GUI config
merge code
put "max_run_time" also in the config GUI
see that's running
align text to the left

Thanks BlackJack: http://www.python-
forum.de/viewtopic.php?f=18&t=34665&p=263923#p263923
update CoCo2b to newer API
log TIMER read/write
add more comments into PIA

activate debugging for PIA / IRQ