ULA (Sinclair ZX Spectrum 16/48k) Updated Apr 18, 2026 · 2 min read · Support · 0 viewing 🔥 Most active page right now Previous Power Circuit (Sinclair ZX Spectrum 16/48k) The ZX Spectrum 16/48k accepts 9V DC positive outer (inverted) power supply. The 9V goes to parts of... Next Z80 CPU (Sinclair ZX Spectrum 16/48k) After the ULA is checked and you are seeing something on screen (even it if is messed up), the nex...