Well, after I read a group of posts I started to understand what your interest of introducing these new interrupts was. I am not very familiar with interrupts but I want to take advantage of this new approach. First I did was to try to play with your Blink program and at compilation time (16F628) I got an error: “Variable wsave3 position request 416 beyond Ram_End 335” I have look every where for an explanation of this error with no luck. Please, advice.