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10. Consider a computer system that contains an I/O module controlling a simple keyboard/printer teletype. The following registers are contained in the processor and connected directly to the system bus: INPR: OUTR: FGI: FGO: IEN: Input Register, 8 bits Output Register, 8 bits Input Flag, 1 bit Output Flag, 1 bit Interrupt Enable, 1 bit Keystroke input from the teletype and printer output to the teletype 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. a) Describe how the processor, 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.

10. Consider a computer system that contains an I/O module controlling a simple keyboard/printer teletype. The following registers are contained in the processor and connected directly to the system bus: INPR: OUTR: FGI: FGO: IEN: Input Register, 8 bits Output Register, 8 bits Input Flag, 1 bit Output Flag, 1 bit Interrupt Enable, 1 bit Keystroke input from the teletype and printer output to the teletype 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. a) Describe how the processor, 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.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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10. Consider a computer system that contains an I/O module controlling a simple keyboard/printer teletype. The following registers are contained in the processor and connected directly to the system bus: INPR: OUTR: FGI: FGO: IEN: Input Register, 8 bits Output Register, 8 bits Input Flag, 1 bit Output Flag, 1 bit Interrupt Enable, 1 bit Keystroke input from the teletype and printer output to the teletype 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. a) Describe how the processor, 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.
Transcribed Image Text:10. Consider a computer system that contains an I/O module controlling a simple keyboard/printer teletype. The following registers are contained in the processor and connected directly to the system bus: INPR: OUTR: FGI: FGO: IEN: Input Register, 8 bits Output Register, 8 bits Input Flag, 1 bit Output Flag, 1 bit Interrupt Enable, 1 bit Keystroke input from the teletype and printer output to the teletype 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. a) Describe how the processor, 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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