A project log for NP-41 RPN Calculator

NP-41 is a hardware realization of the Nonpariel calculator simulator. It executes the original HP-41C / CV byte-codes.

Chris ChungChris Chung 10/06/2015 at 00:230 Comments

This is the first message you will see on a HP-41C calculator. Or when you replace your battery and have the internal memory reset.

I had assembled the a first prototyping unit. Took me two takes and a fired MSP430FR6989 MCU. I have not yet get the internal charge pump working so the LCD does not have the best contrast and have some ghosting issues.

This is an important step in this project as it's a proof of concept.