Xts PB 700

Hi, for today we have ...

I started to use my Aux UART (for DOWNLoad / UPLoad binary files w/ a computer), keeping UsbUART to debug/program calculator native code.

Then I re-used my good old .BP4 file format (for 16greyshades pictures) to display pictures on SSD1322 (256x64x4bpp display)

The inner diagram with both MCUs (AT328P / RP2040) & both power system

Hi, today I finally mounted a battery pack, it's a rechargable NI-MH 4xAA 1.2v.

It provide a 4.8v @2400mAh, enough to power the 2x screens, 2x MCUs, keyboard ...

so now, system can be both power by USB connector / 4.8v battery

January 2023, 25th : 

The build is ready to be enclosed. there is less room that I imagined.

I had to forget a lot of ideas such as mounting MCU on removable cards to change the CALC behavior (WiFi, dumb terminal, calculator....)

During January 2023 :

unsoldering much as possible original parts

& start to experiment existing wirings..

December 2022, 31th

received the non-working Unit in pretty good looking state.

I still work on software part w/o be sure of screen size, keyboard map... that I will be able to re-use.