Scientific RPN Calculator (with ATTINY85)

[deetee]

Hi Pauli!

Thanks for all of your ideas.

I tried to implement statistics and linear regression - which needed approx. 1000 bytes - to much - so I refused this for now.

Then I implemented converting polar/rectangular coordinates and h/hms which "costs" me all of my spare 800 bytes.

I know the gamma function, but neither I needed in before nor saw it on basic HP-calculators. But the gamma function seems to be worth implementing and doing this with Nemes' formula should "cost" approx. 200 bytes.

I did not know the memmove function but I will give it a try (it is on my todo-list).

But (overnight) I fell in love with your idea to save user defined constants to the EEPROM. I gave it a rough try and implemented
"saving 3 characters and a float number" to a "EEPROM slot" and
"menu driven selecting due to these 3 characters and loading the float number".
This demands approx. 700 bytes only (and there is still room for improvement).

Still a lot to do this weekend ...

Regards
deetee