The comprehensive test is the parallel port 8255A' s output and input functions and the keyboard and display interface chip functions together, the " DVCC-51Net single chip integrated experimental system" hardware circuit conditions permit, the " experiment two parallel I/O interfaces 8255A Application " and" experimental application of six keyboard display controller 8279 experiment " to integrate, comprehensive experiment. Comprehensive experimental content with 2 options: Option One, using the keyboard display controller 8279 of the keyboard input to control the parallel I/O interfaces 8255A of the PB port output. Programme II, using parallel I/O interfaces 8255A' s PA input port to control the keyboard and display controller 8279 displays the output.

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