Chapter 3

Question 1

What are I/O Protection

Answer 1

All I/O instructions are privileged instructions, known as I/O protection.

Question 2

What is memory address space

Answer 2

Region in the main memory that a process can legally access is known as memory address space.

Question 3

What is Memory protection

Answer 3

Memory protection is a way to control memory access rights on a computer.

Question 4

What are base register and limit register

Answer 4

In order to have memory protection, add two registers that determine the range of legal addresses a program may access.
Base register (Holds the smallest legal physical memory address)
Limit register (contains the size of range)

Question 5

What is the first shell

Answer 5

Bon shell

Question 6

What are the services offered by OS

Answer 6

• Program execution
• I/O operations
• File system manipulation
• Communication between processes and users
• Error detection and handling
• Resource management
• Accounting information
• Protection

Question 7

What is AUI

Answer 7

Application user interface, like UI

Question 8

What are entry points into kernel

Answer 8

1- System call
2- Interrupt generation
3- Trap
4- Signal

Question 9

What are types of system call

Answer 9

• Process control
• File management
• Device management
• Information maintenance
• Communication (between processes)

Question 10

What are operating system structures

Answer 10

• Simple structure
• Layered approach
• Microkernels
• Virtual machines

Question 11

What is simple structure

Answer 11

Application Program -> Resident system program -> MS DOS device drivers -> ROM BIOS device drivers