8255 parallel interface used to control a 16-key keypad (with line scanning method or inversion method can be), in accordance with plans to connect line: 1> with wire will be connected to the PA0-PA7 jack RL0-RL7, control of the keyboard row data . 2>, using wire to PB0, PB1 jack connected to the Y0, Y1, control the keyboard data. K10 pulled out all the short-circuit sets. 3>, Chip Select CS connection 218H-21FH.

zhk2.asm

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