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A system is based on an 8-bit microprocessor and has two I/O devices. The I/O controllers for this system use separate control and status registers. Both devices handle data on a 1-byte-​at-​a-​time basis. The first device has two status lines and three control lines. The second device has three status lines and four control lines.

 

a. How many 8-bit I/O control module registers do we need for status reading and control of

each device?

b. What is the total number of needed control module registers given that the first device is

an output-​only device?

c. How many distinct addresses are needed to control the two devices?
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