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8255A programmable parallel interface to complete the traffic lights of the 8255A experiment B and C port to control port 12 and out bright LED (light output of 0, the output for an out), simulation of traffic lights at a crossroads.-programmable parallel interface 8255A completed, the traffic lights experimental 8255A port B and C- I control 12 LED bright and methomyl (output of 0-liang, the output of an anti), the simulation of traffic lights at a crossroads.