Quorum-8266 is a port of esp8266-zxspectrum-emulator.
Since ESP8266 has only 80k of RAM, we cannot do 128k. So is reasonable to emulate the most advanced ZX Spectrum 48k compatible machines. Quorum with its shadow RAM and CP/M capabilities looks like a good choise.
Basic schematics is finished.
Next stage will be PCB routing.