TI-66 double speed mod

[Steve Simpkin]

Very cool Nigel! I wonder how much faster you could make this by adding an even smaller value resistor (between 22k and 68k).

For reference, I noted the following counting speeds (running for 10 seconds) of a couple of HPs I had handy.

I was using a program similar to the following and let it run for 10 seconds.
01 1
02 +
03 GTO 01

Results:
HP-25 (1977): Count = 52
HP-12C (1987): Count =56
HP 35s (2012): Count =243


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