TI-66 double speed mod

[Nigel (UK)]

(07-06-2022 07:51 PM)Steve Simpkin Wrote:  The following post from Gene Wright shows counts of addition looping over a 60 second time period for many models. When possible he used a faster counting program than I did.
https://www.hpmuseum.org/cgi-sys/cgiwrap...?read=1002


Other calculator benchmarks:
https://www.hpmuseum.org/cgi-sys/cgiwrap...i?read=700
https://www.thimet.de/CalcCollection/Cal...mance.html

Thanks for these links!

For the addition loop in the first link I get 420 loops in one minute, as opposed to 210 for the unmodified calculator.

I haven't tried the n-queens test in the second link as it would probably take almost an hour. However, running the alternative "simple test" the calculator manages 118 loops in one minute, as opposed to 57.

In the third test, the execution time of the program is 17s as opposed to 34.7s.

So in every case the modification has doubled the speed! Good to know.

One interesting fact - in the second link, an n-queens time is listed for "TI-66 Turbo x2.7"! This suggests that I can decrease the resistor further and speed things up by about a third. I may investigate this further tomorrow.

Nigel (UK)