RPN Scientific Firmware for the Spikenzielabs Calculator Kit

[jpcuzzourt]

(10-07-2019 10:15 PM)jklsadf Wrote:  For anyone interested, that cheap diy calculator kit Maximilian posted about can be reprogrammed to use RPN, even though it doesn't use an atmel microcontroller. See https://github.com/jjj11x/stc_rpncalc

This is good news. So the micro is 8051 compatible, and has a serial flash bootloader.
These kits are available for about 11 bucks on aliExpress now.

If only it had a nice wide 'ENTER' key...

I may get one to play with.
EDIT: I've ordered one and read through the project at github. Because the included micro is fairly limited, I would want to consider a redesign to use an AVR instead.
But initially I'll just wait for it to arrive in a couple of weeks, build it, and try the RPN code that Jeff has developed already.
With the backlit LCD, this thing would be a battery hog. I'm interested in seeing how the keys feel. Jeff references some Omron replacements that are easier to operate.