HW4 - Write an appropriate procedure to read in a packed...

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EE3750 HW4 Due: 7/21/03 1. A parallel port in the form of an 82C55 is connected to the data bus of an 8086 CPU. It has a base address of 0258h. Port A of the device is connected to two seven segment displays and decoders. Port B is connected to eight DIP switches. Observe the following diagram:
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Unformatted text preview: Write an appropriate procedure to read in a packed BCD value from the DIP switches and use that value as the start of a countdown timer on port A. Do not forget to configure the 82C55. Any other details of operation are left to the students discretion....
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