The use of general-purpose microprocessor to achieve the experimental box text adventure game " Atonement bell." Microcomputer Principle to the ongoing innovation of undergraduates is very practical. Wiring Method: PA7 ~ PA0 access digital pipe yards mouth, PB5 ~ PB0 connected digital bit code mouth, PC7 ~ PC0 connected LED lights, 8253 Counter 0 CLK pick 1MHZ, GATE then 5V, OUT connected to IRQ, 8253 Address D400H, 8255A base address D408H.

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