2 for selection of 8253' s counter 100ms timing, the output OUT2 and 8259 IRQ7 linked to 100 ms when the timer generates an interrupt signal when the interrupt service routine, the hours, minutes, seconds count, and sent to the appropriate storage unit 8255, A port connection segment digital tube-bit select signal, B port then select the segment of digital control signals, the sub-values ??can be programmed through 8255 to the seven segment LED display.

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