Schematics I made while studying how the ZX80/81 works
- ZX81_Detailed_Schematics - Detailed Schematics used to create the PCBs - Gerber file
- ZX81_Andy_Rea_ULA_Explained - ZX81 and ULA logic based on explained by Andy Rea
- ZX81_Complete - Complete Schematic (ZX80 + Slow Circuit = ZX81) based on Sinclairs ZX80 Schematics and Grant Searle project