>I have seen a couple of tips and tricks on PIC programming that I am
>looking for again..

>#1      A routine to clear all RAM on startup (16F84)
; Here is the code that I use on the 16c622.  You will need to adjust the
; pointers for the 16F84.  (Base address and number of loops.)

; Clear RAM memory code
    movlw   H'20'       ; Set the pointer to the base of RAM
    movwf   _fsr
NEXTRAM:
    clrf    _indf       ; Clear the memory location pointed to by FSR
    incf    _fsr,f      ; Increment the FSR (file select register)
    btfss   _fsr,6      ; Test if top of ram reached
    goto    NEXTRAM     ; Return to next memory location
    btfss   _fsr,5      ; Test if top of ram reached
    goto    NEXTRAM     ; Return to next memory location
    btfss   _fsr,4      ; Test if top of ram reached
    goto    NEXTRAM     ; Return to next memory location


>#2      A routine for saving and restoring W,STATUS, etc..  during
>interrupts..

This requires using the swap function to keep from corrupting the STATUS
register.  It is all detailed on the PIC web site under FAQ.