Retroshield for Arduino Mega

RetroShield is an open-source project that connects real 8-bit microprocessors to Arduino Mega or Teensy boards, allowing users to build and modify microprocessor projects easily using Arduino code. It supports multiple classic microprocessors like the Intel 4004, 6502, Z80, and more, with completed daughtercards and ongoing developments for others. The project offers easy-to-build kits for sale, features emulated hardware peripherals, and provides extensive design files and software under open licenses. RetroShield aims to expand support for various vintage processors while enabling enthusiasts to experiment with retro computing through modern microcontrollers.