Man that brings back the memories: I had a Vic-20 and had learned how (through magazines) to program in BASIC. I had the Vic-20 manual, and for some reason could not conceptualize the link between assembly language and the op-codes. I remember the day I saw a BASIC program that poked the assembly op codes into RAM for a simple keyboard - WOW! suddenly the light went on in my head. Good times.