Essentials of Computer Organization and Architecture
5th Edition
ISBN: 9781284123036
Author: Linda Null
Publisher: Jones & Bartlett Learning
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Chapter 4, Problem 25E
a)
Program Plan Intro
Hexadecimal code:
The hexadecimal code is an object code of each instruction. It is converted by assembler with instruction set.
b)
Program Plan Intro
Symbol table:
It is a one of the function of the assembler which builds the symbol table to fill addresses of corresponding machine language instruction. It has labels with corresponding memory addresses.
c)
Explanation of Solution
Values in the accumulator when the given program executes in assembler:
The program converted into object code. The accumulator values for the given program is as follows:
| Address counter | Label | Opcode | Operand | Hexadecimal code |
Accumulator (AC) |
| 200 | Begin | LOAD | Base | 1209 | 0200 |
| 201 | ADD | offs | 320A | 0209 | |
| 202 | Loop | SUBT | One | 420B | 0208 |
| 203 | STORE | Addr | 220C | ||
| 204 | SKIPCOND | 800 | 8800 | ||
| 205 | JUMP | Done | 9208 | ||
| 206 | JUMPI | Addr | C20C | ||
| 207 | CLEAR | A000 | |||
| 208 | Done | HALT | 7000 | ||
| 209 | ... |
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Chapter 4 Solutions
Essentials of Computer Organization and Architecture
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