Exam (elaborations)
COS2621 Assignment DUE 22 July 2024
With clear and concise explanations, this document serves as an invaluable study resource, helping students grasp complex concepts with ease.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Content preview
COS2621ASSIGNMENT 02
DUE DATE: 22 July 2024
UNIQUE NUMBER: 791452
, QUESTION 1
Part (a)
Given the memory
1. LOAD IMMEDIATE 20
o This instruction loads the immediate value 20 directly into the
accumulator.
o Accumulator = 20
2. LOAD DIRECT 20
o This instruction loads the value from the memory address specified
directly (address 20) into the accumulator.
o Memory address 20 contains the value 30.
o Accumulator = 30
3. LOAD INDIRECT 20
o This instruction first retrieves the value stored at the memory address
specified (address 20), which is 30. This value is then used as the
address to load the final value into the accumulator.
o Memory address 20 contains the value 30.
o Memory address 30 contains the value 40.
o Accumulator = 40
Part (b)
Examples of Intel x86 instructions using various addressing modes:
1. Immediate Addressing
o The operand is specified explicitly in the instruction.
o Example: MOV AX, 5
▪ This moves the immediate value 5 into the AX register.
2. Direct Addressing
o The operand's address is given directly in the instruction.
o Example: MOV AX, [1234h]
▪ This moves the value at memory address 1234h into the AX
register.
3. Stack Addressing
o Operands are implied to be on the stack, typically using the stack
pointer.
o Example: PUSH AX
▪ This pushes the contents of the AX register onto the stack.
o Example: POP BX
▪ This pops the top value from the stack into the BX register.
4. Indexed Addressing
o The operand's address is determined by adding a constant value to the
contents of an index register.
o Example: MOV AX, [BX+SI]
▪ This moves the value from the address obtained by adding the
contents of BX and SI into the AX register.
5. Base-Addressing
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller GeniusGears. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R50,47. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83684 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now