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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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