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51 single chip microcomputer communication between two computers
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The P1 port of a and B machines is connected with 8 light-emitting diodes for communication. A machine generates 5 times of flow light data, 5 times of 8 lights flashing at the same time, and 5 times of high 4-bit light and low 4-bit light wheel flow data, which reciprocates. While a machine displays, it sends these data to B machine, and displays them on B machine at the same time. It requires that a machine does not need to interrupt the transmission, and B machine receives them with interrupt program Even check.
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Simple operation by assembly language
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The compressed BCD code in accumulator A is disassembled to form non compressed BCD code, which is stored in 40H and 41h units
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