hp 67 vintage calculator

hp 67 rom emulate by hp CPU with ESP32. Disp. 7 seg 5082-7414 drive by HT16K33 Holtek.
Coming great work : https://www.jacques-laporte.org

Bernard

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Description

I first built Hp25 with Arduino 328, after hp 35 with Atmega 1284,
But for speed concern I decide to use ESP32 240 MHz and long integer manipulations.
Fist model on lab pcb, ans after testing built on manufacture PCB to JLCPCB with Easyeda.
I use keyboard picture of HP67.
I need to find how to rebuild keyboard like original hp67.
Rigth button emulate card insert.