Longest computation that your calculator performed for you?

03302017, 07:30 PM
Post: #2




RE: Longest computation that your calculator performed for you?
30+ years ago I needed to figure out the ringing time constant of a circuit with inductors, capacitors, and resistors, and didn't have the math background to do it the fast way, so I wrote a program for my TI59 to do it kind of like a Simpson's approximation of an integral, chopping the ringing waveform up into tiny slivers and simulating the behavior of each of the components as they worked together. It ran all nightâ€”or maybe 24 hours. I think I did it a few times with different step sizes to make sure I had really converged on a valid answer. I'm not nearly as strong in math as some on this forum are, but I can always find a way to bruteforce something to get the answers I need.
A few years ago I used my HP71, in BASIC, to generate large lookup tables (most being 65,536 cells each, and 16bit, meaning 128KB per table) for hyperfast, accurate, 16bit scaledinteger math, to use as a virtual coprocessor for hardware that didn't have a normal coprocessor. It took my HP71 a few weeks to generate the tables and convert to Intel Hex files. I posted them, along with a discussion of the value of scaledinteger math and how to use it effectively, and information on how each table was calculated, on my website, at http://wilsonminesco.com/16bitMathTables/ . http://WilsonMinesCo.com (Lots of HP41 links at the bottom of the links page, http://wilsonminesco.com/links.html ) 

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