DIY Calculator

[Dave Britten]

(04-09-2019 09:42 AM)agarza Wrote:  

(04-09-2019 03:09 AM)Dave Britten Wrote:  I'll take one!

I'd recommend making it programmable to attract the biggest audience. And maybe use a key layout that would make it easy to support a 41CX emulator firmware.

Unfortunately there is very little memory left so making it programmable is not an option.

Hey, if Sinclair can make a programmable scientific calculator with half the ROM of an HP-35, then a 32KB AVR should be no sweat! ;D

Since it's an AVR, I would suggest including a USB programming port (would that model require an external USB-to-TTL chip?) and leaving the Arduino bootloader on it. It would make for a very nice platform for experimentation.