Lecture 1

Question 1

CPU

Answer 1

controls the operation of the computer and performs its data processing functions

Question 2

Main Memory

Answer 2

Stores data

Question 3

I/O

Answer 3

moves data between the computer and its external enviroment

Question 4

System Interconnnection

Answer 4

some mechanism that provides for communication among CPU, main memory, and I/O

Question 5

CPU Major Structural Components

Answer 5

Control Unit
Arithmetic and Logic Unit (ALU)
Registers
CPU Interconnection

Question 6

Control Unit

Answer 6

Controls the operation of the CPU and hence the computer

Question 7

Arithmetic and Logic Unit (ALU)

Answer 7

Performs the computer’s data processing function

Question 8

CPU Interconnection

Answer 8

Some mechanism that provides for communication among the control unit, ALU, and registers

Question 9

Registers

Answer 9

Memory Buffer Register (MBR)
Memory Address Register (MAR)
Instruction Register (IR)
Instruction Buffer Register (IBR)
Program Counter (PC)
Accumulator (AC) and Multiplier Quotient (MQ)

Question 10

Memory Buffer Register (MBR)

Answer 10

Contains a word to be stored in memory or sent to the I/O unit, or is used to receive a word from memory or from the I/O unit

Question 11

Memory Address Register (MAR)

Answer 11

Specifies the address in memory of the word to be written from or read into the MBR

Question 12

Instruction Register (IR)

Answer 12

Contains the 8-bit opcode instruction being executed

Question 13

Instruction Buffer Register (IBR)

Answer 13

Employed to temporarily hold the right-hand instruction from a word in memory

Question 14

Program Counter (PC)

Answer 14

Contains the address of the next instruction pair to be fetched from memory

Question 15

Accumulator (AC) and Multiplier Quotient (MQ)

Answer 15

Employed to temporarily hold operands and results of ALU operations