Peter,
Was this loop:
For t=0 to 7000 step 0.006
x=sin(0.99*t)-0.7*cos(3.01*t)
y=cos(1.01*t)+0.1*sin(15.03*t)
x=x*200+400 : y=y*200+400
................................
Next
derived (ported, translated, taken, etc.) from some other source originally written in the C language?
Just asking.