Lesson 3: Machine Models

Question 1

Machine Model that operates using LIFO

Answer 1

Stack Machine Model

Question 2

Machine Model has simplified instruction set and no need for registers but is slower due to heavy reliance on memory access.

Answer 2

Stack Machine Model

Question 3

What are some Stack-Based ISA Examples?

Answer 3

HP 3000, ICL 2900, Java Virtual Machine, Intel x87 Floating Point Unit

Question 4

Machine Model that uses a single accumulator register for operations.

Answer 4

Accumulator Machine Model

Question 5

In this Machine Model, instructions like ADD and SUB work directly on the accumulator and memory.

Answer 5

Accumulator Machine Model

Question 6

Machine Model that has simplified CPU design and fewer registers required but accumulator becomes a bottleneck in complex operations.

Answer 6

Accumulator Machine Model

Question 7

What are some of the Accumulator-based ISA examples.

Answer 7

ENIAC, IBM 701

Question 8

Machine Model that combines operations on registers and memory.

Answer 8

Register-Memory Machine Model

Question 9

Machine Model that allows direct access between registers and memory locations without separate load/store instructions.

Answer 9

Register Memory Machine Model

Question 10

Machine Model that has reduced instruction count but complexity is increased due to memory access within instructions.

Answer 10

Register-Memory Machine Model

Question 11

What are some of the register-memory machine model examples?

Answer 11

VAX, 80x86

Question 12

Machine Model that operates only on registers, with explicit load and store operations between registers and memory.

Answer 12

Register-register Machine Model

Question 13

Machine Model that is found in modern architectures like ARM and MIPS.

Answer 13

Register-Register Machine Model

Question 14

Machine Model that has high speed and efficient pipeline execution but requires more instructions for simple operations.

Answer 14

Register-Register Machine Model

Question 15

What are some of the Register-Register ISA examples?

Answer 15

MIPS, SPARC

Question 16

How many explicit operands are there in Stack-Based Model?

Answer 16

0

Question 17

How many explicit operands are there in Accumulator-Based Model?

Answer 17

1

Question 18

How many explicit operands are there in Register-Memory Model?

Answer 18

2-3

Question 19

How many explicit operands are there in Register-Register Model?

Answer 19

2-3