The old challenge: HP-35 on Arduino

[sasa]

Back in June 2011, Jacques published Pietro De Luca's article in English about emulating HP-35 on Arduino:
https://archived.hpcalc.org/laporte/HP35_Arduino.htm

In November 2011, one Itallian magazine called "Jurassic News", which promotes free movement
of ideas, published the article:

https://www.jurassicnews.com/Archivio/Is...sue_38.PDF
Jurassic news - Year 6 - number 38 - November 2011, page 44

In the article, Pietro gave a challenge if someone can create the same functionality of HP35 in less space ROM on Arduino "Genuino Uno" (based on ATmega 328p).

Even GCC for AVRs improved quite a bit in years, as well as Arduino libraries, this task may still be interesting for large Arduino community, perhaps may also be an interesting exercise for some young members here.

The obvious solution is to move firmware to EEPROM and make some minor code optimization (if possible). However, as ATmega 328p have only 1K of EEPROM and MOSTEK instructions 10-bits long, this may be still interesting challenge for younger members affected in programming and electronic, which still learn and use such old, but still popular Arduino platform.

Have a nice fun!