Well, I did not realize the code ran 1000 times. Must have skipped this when 
reading the article). My mistake, sorry.



So: ashes on my head, mea culpa, mea culpa, mea maxima culpa ;-)



Besides, I am a veteran from those days, too. Drawing my first sine-curve on 
a CRT took a really long time, 10 minutes or so.

(No, not the math did take much time: you had to fill the screen with 
characters from 0-255, remap the dot-matrices of the characters into RAM, 
then calculate individual points position and set the appropriate bits in 
the character's 16 bytes dot-matrix. Actually the 3.5kB RAM did not suffice 
to hold all characters and the BASIC program, so the lower right part of the 
screen was always blank.)



Things did speed up a bit since those days. ;-)

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