Programming will be 8253 counter 0, counter 1 work set to Mode 2 for the prescaler, the timer 2 in the way of 3, square Timer 0 Timer 1 output as the input, timer 1 Timer 2 output as the input, timer 2, then the LED output, the run can be observed that the LED lights flicker in the non-stop.

8253.txt
D53.asm

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