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  • COS2621 - Computer Organisation (COS2621)
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COS2621 Assignment 2 2022 Solution

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COS2621 - Computer Organisation (COS2621)
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Solutions to the Assignment for COS2621. Assembly code included in the document.

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COS2621 – COMPUTER ORGANIZATION
ASSIGNMENT 2 SOLUTIONS
2022

, Discussion of assignment 02


All the questions were not marked in detail. You received credit for the questions for which you
submitted a reasonable effort.

Question 1

(a) The following table reflects the memory contents of a part of memory in a one-
address machine with an accumulator:



Address Contents

300 320

305 310

310 310

315 325

320 305

325 300



What values do the following instructions load into the accumulator?

LOAD IMMEDIATE 300: Load immediate means that the operand is part of the
instruction. The value 300 will be loaded into the accumulator.

LOAD DIRECT 320: Load direct means that the instruction contains the address of the
operand: The value 300 is stored in address 320, so the value 300 will be stored in the
accumulator.

LOAD INDIRECT 325: Load indirect means that the address that contains the address of the
Operand forms part of the instruction. Therefore, address 325 contains the address of the
operand, ie the address of the operand is 300. Address 300 contains 320, thus the value
320 will be stored in the accumulator.




2
Connected book
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William Stallings Computer Organization and Architecture, Global Edition
Publisher: Unknown ISBN: 9781292096858 Edition: 1

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