https://hackaday.io/project/172131-piercy-1-zx-spectrum-2-raspberry-pi-mod
PIERCy-1 - ZX Spectrum +2 Raspberry Pi Mod | Hackaday.io
Transforming a broken ZX Spectrum +2 into a battery powered cyberdeck of sorts with display and custom macropad
zx spectrum 2raspberry pipiercy1mod