Digital Fundamentals (11th Edition)
11th Edition
ISBN: 9780132737968
Author: Thomas L. Floyd
Publisher: PEARSON
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Textbook Question
Chapter 1.7, Problem 1CU
What is the basic function of an oscilloscope?
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Whentheuserenters!!,themostrecentcommandinthehistoryisexecuted.In the example above, if the user entered the command:
Osh> !!
The ‘ls -l’ command should be executed and echoed on user’s screen. The command should also be placed in the history buffer as the next command.
Whentheuserentersasingle!followedbyanintegerN,theNthcommandin the history is executed. In the example above, if the user entered the command:
Osh> ! 3
The ‘ps’ command should be executed and echoed on the user’s screen. The command should also be placed in the history buffer as the next command.
Error handling:
The program should also manage basic error handling. For example, if there are no commands in the history, entering !! should result in a message “No commands in history.” Also, if there is no command corresponding to the number entered with the single !, the program should output "No such command in history."
Activity No.
Activity
Time (weeks)
Immediate Predecessors
1
Requirements collection
3
2
Requirements structuring
4
1
3
Process analysis
3
2
4
Data analysis
3
2
5
Logical design
50
3,4
6
Physical design
5
5
7
Implementation
6
6
c. Using the information from part b, prepare a network diagram. Identify the critical path.
2. UNIX Shell and History Feature [20 points]
This question consists of designing a C program to serve as a shell interface that
accepts user commands and then executes each command in a separate process. A
shell interface gives the user a prompt, after which the next command is entered.
The example below illustrates the prompt osh> and the user's next command:
cat prog.c. The UNIX/Linux cat command displays the contents of the file
prog.c on the terminal using the UNIX/Linux cat command and your program
needs to do the same.
osh> cat prog.c
The above can be achieved by running your shell interface as a parent process.
Every time a command is entered, you create a child process by using fork(),
which then executes the user's command using one of the system calls in the
exec() family (as described in Chapter 3). A C program that provides the general
operations of a command-line shell can be seen below.
#include
#include
#define MAX LINE 80 /* The maximum length command */
{
int…
Chapter 1 Solutions
Digital Fundamentals (11th Edition)
Ch. 1.1 - Prob. 1CUCh. 1.1 - Prob. 2CUCh. 1.1 - Prob. 3CUCh. 1.1 - Prob. 4CUCh. 1.1 - Prob. 5CUCh. 1.2 - Prob. 1CUCh. 1.2 - What does bit mean?Ch. 1.2 - What are the bits in a binary system?Ch. 1.2 - Prob. 4CUCh. 1.2 - Prob. 5CU
Ch. 1.2 - Prob. 6CUCh. 1.2 - What is the purpose of a timing diagram?Ch. 1.2 - What is the main advantage of parallel transfer...Ch. 1.3 - When does the NOT function produce a HIGH output?Ch. 1.3 - When does the AND function produce a HIGH output?Ch. 1.3 - Prob. 3CUCh. 1.3 - Prob. 4CUCh. 1.3 - What is a logic gate?Ch. 1.4 - What does a comparator do?Ch. 1.4 - What are the four basic arithmetic operations?Ch. 1.4 - Prob. 3CUCh. 1.4 - Prob. 4CUCh. 1.4 - Prob. 5CUCh. 1.4 - Prob. 6CUCh. 1.4 - What does a counter do?Ch. 1.5 - List three major categories of programmable logic...Ch. 1.5 - Prob. 2CUCh. 1.5 - Name the steps in the programming process.Ch. 1.5 - Prob. 4CUCh. 1.5 - Prob. 5CUCh. 1.6 - What is an integrated circuit?Ch. 1.6 - Prob. 2CUCh. 1.6 - Generally, in what classification does a...Ch. 1.7 - What is the basic function of an oscilloscope?Ch. 1.7 - Name two main differences between an oscilloscope...Ch. 1.7 - What does the volts/div control on an oscilloscope...Ch. 1.7 - What does the sec/div control on an oscilloscope...Ch. 1.7 - Prob. 5CUCh. 1.7 - Prob. 6CUCh. 1.8 - Prob. 1CUCh. 1.8 - Prob. 2CUCh. 1.8 - Prob. 3CUCh. 1.8 - Prob. 4CUCh. 1 - An analog quantity is one having continuous valuesCh. 1 - Prob. 2TFQCh. 1 - Prob. 3TFQCh. 1 - Prob. 4TFQCh. 1 - In positive logic, a LOW level represents a binary...Ch. 1 - If the period of a pulse waveform increases, the...Ch. 1 - Prob. 7TFQCh. 1 - The basic logic operations are AND, OR, and MAYBE.Ch. 1 - If the input to an inverter is a 1, the output is...Ch. 1 - Two broad types of digital integrated circuits are...Ch. 1 - Prob. 1STCh. 1 - Prob. 2STCh. 1 - Prob. 3STCh. 1 - Prob. 4STCh. 1 - Prob. 5STCh. 1 - An inverter performs the NOT operation changes a...Ch. 1 - The output of an AND gate is HIGH when any input...Ch. 1 - The output of an OR gate is HIGH when any input is...Ch. 1 - The device used to convert a binary number to a...Ch. 1 - An example of a data storage device is the logic...Ch. 1 - VHDL is a logic device PLD programming language...Ch. 1 - A CPLD is a controlled program logic device...Ch. 1 - An FPGA is a field-programmable gate array fast...Ch. 1 - A fixed-function IC package containing four AND...Ch. 1 - An LSI device has a circuit complexity of from 10...Ch. 1 - Prob. 1PCh. 1 - Prob. 2PCh. 1 - List three common products that can have either a...Ch. 1 - Explain the difference between positive and...Ch. 1 - Prob. 5PCh. 1 - List the sequence of levels (HIGH and LOW) that...Ch. 1 - Prob. 7PCh. 1 - Prob. 8PCh. 1 - Prob. 9PCh. 1 - Prob. 10PCh. 1 - Determine the duty cycle of the waveform in Figure...Ch. 1 - Prob. 12PCh. 1 - What is the total serial transfer time for the...Ch. 1 - What is the period if the clock frequency is 3.5...Ch. 1 - Form a single logical statement from the following...Ch. 1 - A logic circuit requires HIGHs on all its inputs...Ch. 1 - A basic 2-input logic circuit has a HIGH on one...Ch. 1 - A basic 2-input logic circuit has a HIGH on one...Ch. 1 - Name the logic function of each block in Figure...Ch. 1 - A pulse waveform with a frequency of 10 kHz is...Ch. 1 - Consider a register that can store eight bits....Ch. 1 - Which of the following acronyms do not describe a...Ch. 1 - What do each of the following stand for? SPLD CPLD...Ch. 1 - Prob. 24PCh. 1 - Prob. 25PCh. 1 - A fixed-function digital 1C chip has a complexity...Ch. 1 - Prob. 27PCh. 1 - Label the pin numbers on the packages in Figure...Ch. 1 - A pulse is displayed on the screen of an...Ch. 1 - A waveform is measured on the oscilloscope and its...Ch. 1 - The period of a pulse waveform measures four...Ch. 1 - Prob. 32PCh. 1 - Prob. 33PCh. 1 - Prob. 34PCh. 1 - Explain the signal-tracing method of...Ch. 1 - Prob. 36PCh. 1 - Prob. 37PCh. 1 - Prob. 38PCh. 1 - If the symptom of a particular system is an...Ch. 1 - Prob. 40PCh. 1 - Prob. 41PCh. 1 - Prob. 42PCh. 1 - Assume that you have isolated the problem down to...
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