Description: The use of 8253 to achieve a blinking light effect, and ultimately to achieve a specified time by the regular keyboard input flash, while supporting the use of seven-segment LED countdown display flashes the time to achieve timing setting function. For example: press the keyboard 9 key, the LED flash once per second start, 9 seconds after the flashing, blinking regularly achieved 9 start from the same digital countdown display auxiliary display flashes the time.
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Threen.asm