Astroblast is an interesting listing because the Author XEN included a Routine at the end of his game which the 464 uses to Fill in the Circular landscape, it's not as fast as the FILL routine which is at the end of the IF statement in line 210 to determine if a 464 is being used or not, though at least is a better than Syntax Error. When the programme is listed though, on a 464 it gets to line 210 and Syntax Error occurs because of the Tokenised FILL statement, though have to wonder if it was typed in on a 464 if the programme could be listed since BASIC 1.0 wouldn't have Tokenised the FILL, though would work in BASIC 1.1 as it would automatically translate into a Tokenised format.