Z80 CPU (Sinclair ZX Spectrum 16/48k) Updated Apr 18, 2026 · 4 min read · Support · 0 viewing 🔥 Most active page right now Previous ULA (Sinclair ZX Spectrum 16/48k) The starting point of the system is the ULA chip. If this chip is bad , you will get zero activ... Next 📄 Sinclair ZX Spectrum 128