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All 40 pins are taken out. Support chip: STC89C52 STC12C5A60S2 STC11/10x series AT89S52 and chips compatible with the above chips Use the active locking seat to facilitate frequent plug-in experiments. DC-005 power socket (supporting seat is 5.5*2.1). Self-locking power switch + indicator light. A power switch for easy experimentation and indicators. Resistor power-on reset circuit.