Brad & all,If you are in the Los Angeles, Calif area I could loan you a dual
chan O'scope (20 or 30 MHz)
I live in Torrance (SW of LA proper adjacent to Redondo & Hermosa Beach):
dalescie...@aol.com
For you PC-8201a owners here is a short 1 line pgm to iterate to 17 significant
digits of PI, in 25 mins 25sec for 4.9MHz clock.
Why use 22/7 or 355/113 =6sd, 355/113# <8sd
4 powerCONT: defDBLd,i: Time$="000000"::for J=2 to 46378 step4: i=J: d=d
+4/(i*(i+1)*(i+2)) -4/((i+2)*(i+3)*i+4)): next:?Time$" 3"chr$(27)d;(i-2)/4;:beep
algorithm:
pi = 3 +4/(2*3*4)-4/(4*5*6) +4/(6*7*8)-4/(8*9*10)....repeat sequence until
reach limit of 8201a double precision math routines
=16 sig digits, squeezed out 17th by cutting iteration just before it breaks
down - result begins slow downward plunge (decreases)(46378-2)/4 = 11594 actual
iterations Assumes 1st digit of PI is 3
Result: 3.1415926535897932 (25 min, no spaces between pgm cmds) {does 12
sig digits in 3min}
Any motivated Math majors able to design an algorithm that expands beyond 17sd
independent of double prec assy lang limit?? :-)
if there is interest, I could post more:
1..array of 17 for/next targets for each add'l digit displayed on separate
lines in two columns taking up the whole display area.(displays time &
expanding PI, current For/Next tgt) adds 25 sec for extra displays (25:50)
2. creative way to save same to a file, formatted as was displayed. (ordered:
1st - 8th, 2nd - 9th....) in lieu of print screen to file!!! TBD
Dale... K3MNN /6 since 1967 retired TRW Space & Electronics 2006 Redondo
Beach, Calif
