Microcomputer Experiment 1, the preparation process: 8253 counter 0 and counter two of the input clock frequency divider, a period of 1 second square wave, the square wave control buzzer alarm signal, but also logic input pin to pen up the inspection program is correct. 2, 8253, to write a clock program.

8253\8253.ASM
....\8253.doc
8253

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