92. Graphics demo
~~~~~~~~~~~~~~~~~
This is a short demonstration of an interesting undocumented feature of the
BBC Operating System on the BBC B, B+, Master, Arc etc.. It's a weird graphic
effect that is easier to demonstrate than describe, so get typing!

Make sure you type it in very carefully, and save it before you run it. If
you make any mistakes, the machine might 'hang up'.

10 REPEAT:READ A$:A%=EVAL("&"+A$):CALL 65518:UNTIL A%=&15
20 DATA 16,7,1F,C,C,88,83,41,70,72,69,6C,86,46,6F,6F,6C,1E,15