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Hello, Thanks for the tip. I'm a beginner and about to start building the Midibox Sid. I had already noticed my PSU was missing some pins, and at first I thought it was broken. But the C64 did power up, and as I can see now it does have all the necessary voltages and ground. I think I understand the workaround you mentioned. My PSU plug only has pins 2, 5, 6 and 7. edit: my PSU is a European 220V which came from Germany.