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Consider a computer system that contains an I/O module controlling a simple keyboard/ printer Teletype. The following registers are contained in the CPU and connected directly to the system bus:
INPR: Input Register, 8 bits OUTR: Output Register, 8 bits FGI: Input Flag, 1 bit FGO: Output Flag, 1 bit IEN: Interrupt Enable, 1 bit
Keystroke input from the Teletype and output to the printer are controlled by the I/O module. The Teletype is able to encode an alphanumeric symbol to an 8-bit word and decode an 8-bit word into an alphanumeric symbol.
The Input flag is set when an 8-bit word enters the input register from the Teletype. The Output flag is set when a word is printed.
a. Describe how de CPU, using the first four registers listed in this problem, can achieve I/O with the Teletype. b. Describe how the function can be performed more efficiently by also employing IEN.
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