Thanks Henrik.You understand my pain.

Well,what i am trying to do here is actually to have single channel encoder from each encoder (2 encoder) and feed it into PIC.I want to use interrupt but i belive when the interrupt occured,you got to clear it right?.Is this might lead to missing pulse as you have to loop to clear the interrupt?.Although without pause?.I even thought about using RB Port Change Interrupt as i belive i could hook up quadrature encoder to RB7:RB4 but i belive it could make some delay in clearing and again lead to missing pulse.

My apologise for confusing you with 18F4550 and 18F4431.I do own this chip and it's more awsome than LM629.