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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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This question asks you to write programs in assembler language. You are recommended to use no more than 200 words in your answer to this question. A microprocessor is wired into a sensing control circuit so that the memory locations 80 and 81 each contain the values 0 or 1. Memory location 84 is connected to a motor controller. When the value in 84 is 0 the motor is off. When it is 1 the motor is on. Write a program to switch on the motor when the values in locations 80 and 81 are both 1, and to switch off the motor when the values in locations 80 and 81 are both 0. Your program should start at memory location 10. You can only use the assembly language instructions, MOV, JMP and JNZ introduced in Book 3. Assume that the MOV instruction updates the flags with the status register. Explain how your program works and meets the specification.

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