On retro-computing: Sinclair ZX Spectrum – Quantum Bits
Green PCB motherboard of 1982 Sinclair ZX Spectrum [Issue Two 16k]. For early computing. home computers, popular electronics, British computers Stock Photo - Alamy
ZX Spectrum PCB Schematics and Layout - Spectrum for Everyone
Hardware - z00m's speccy corner
ZX Spectrum PCB Schematics and Layout - Spectrum for Everyone