Chapter 2

Question 1

Instruction Execution in order.

When does this happen?

Answer 1

• Fetch next instruction from memory
• Change program counter to point to next instruction
• Determine type of instruction just fetched
• if instruction uses a word in memory, locate it
• Fetch word. If needed, into a CPU register
• Execute Instruction

It occurs whenever power is applied.

Question 2

Benefits of Machines with interpreted instructions?

Answer 2

• Ability to fix incorrectly implemented instructions in field, even make up for design deficiencies in basic hardware.
• Opportunity to add new instructions at minimal cost, even after delivery of machine
• Structured design that permitted efficient development, testing, and documenting of complex instructions

Question 3

Types of Instructions

Answer 3

Some will provide or pull information,,

Some will alter information

EX: ‘Add Register 2’ would be completed in perhaps register 1

Question 4

Design Principles for modern computers

Answer 4

• All instructions directly executed by hardware
• Maximize rate at which instructions are issued
• Instructions should be easy to decode
• Only loads and stores should reference memory
• Provide plenty of Registers.