HOW MANY BITS ARE NEEDED FOR THE OPCODE?

HOW MANY BITS ARE NEEDED FOR THE OPCODE?

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1. A digital computer has a memory unit with 40 bits per word. The instruction set consists of 210 different operations. All instructions have an operation code part (opcode) and an address part (allowing for only one address). Each instruction is stored in one word of memory.[11 marks]
 

1. How many bits are needed for the opcode?  [3 marks]
2. How many bits are left for the address part of the instruction? [3 marks]
3. What is the maximum allowable size for memory? [2 marks]
4. What is the largest unsigned binary number that can be accommodated in one word of memory? [3 marks]

 
2. Consider the MARIE program below.    [9 marks]
 

1. List the hexadecimal code for each instruction. [3 marks]
2. Draw the symbol table. [3 marks]
3. What is the value stored in the AC when the program terminates? [3 marks]

Hex
Addr Label Instruction
100  Start,  Load A
101  Add B
102  Store Temp
103  Load C
104  Add D
105  Add Temp
106  Store F
107  Output
108  HALT
109  A,  DEC 5
10A ; B,  DEC 3
10B  C,  DEC 4
10C  D,  DEC 13
10D  E,  DEC 3
10E  Temp, HEX 00FD
10F  F, ; HEX 00FE


3. Choose one area of rapid technological change in IT or Computer Science, research and report on recent developments and the outlook for the future in the area that you have chosen. You will need to provide both in text citations and bibliography entries according to Faculty of Business policy (APA format). Your report should be around 500 words.    [10 marks]
 
Online submission via Turnitin is required for this assignment.

Rationale:

This assessment task covers topics on CPU operation and Instruction Set Architecture, and has been designed to ensure that you are engaging with the subject content on a regular basis. More specifically it seeks to assess your ability to:
 

• be able to investigate the internal operation of the Central Processing Unit (CPU) and describe how it is used to execute instructions;
• be able to discuss various programming tools available and their relationship to the architecture;
• be able to investigate, evaluate and communicate general trends in computing technologies including examples of leading edge developments;