A highly-efficient projection system is provided, including a light source, a color separator, a scrolling unit, a light valve, and a projection lens unit. The engagement stop has an engagement protrusion and is disposed on one of the garnish main body and the garnish lid. The registers are then tested and those found bad are identified and avoided by the allocationdeallocation logic, which is used to assign registers to the various instructions being executed by the microprocessor. The two terminals of the transistor are connected respectively to a first terminal of the memristor and to a first bit line.