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)
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Chapter1: Computer Networks And The Internet
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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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