Power Circuit (Sinclair ZX Spectrum 16/48k) Updated Apr 18, 2026 · 2 min read · Support · 0 viewing 🔥 Most active page right now Previous Model Versions (Sinclair ZX Spectrum 16/48k) A great resource for the Spectrum versions and images is https://spectrumforeveryone.com/technical/... Next 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...