ULA (ZX Spectrum 16 48k) Updated Mar 15, 2026 · 2 min read · 0 viewing Previous Power Circuit (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 (ZX Spectrum 16 48k) After the ULA is checked and you are seeing something on screen (even it if is messed up), the nex...