A1, A0: Address line used to port 8255 PA, PB port, PC port and a control register when A1 = 0, A0 = 0 时, PA port is selected when A1 = 0, A0 = 1 when. The PB is selected when A1 = 1, A0 = 0 时, PC port is selected when A1 = 1.A0 = 1, the control register is selected

8255仿真\8255C键盘显示器程序34.DSN
........\8255C键盘显示器程序34.hex
........\8255C键盘显示器程序34.PWI
........\Last Loaded 8255C键盘显示器程序34.DBK

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