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computer science
digital systems principles and application

Questions and Answers of Digital Systems Principles And Application

Convert B2F16 to decimal.
Convert 352716 to binary.
Your PC encounters an error when running an application. The dialog box reports information about the addresses that it could not read or write. What number system is used to report the address area?
Convert each of the hex values from Problem 2-4 to binary.Data from problem 2-4Convert each hex number to its decimal equivalent.(a)*743 (b) 36 (c)*37FD (d) 2000(e)*165(f) ABCD(g)*7FF(h) 1204(i)
Convert 0110100000111001 (BCD) to its decimal equivalent.
What range of decimal values can be represented by a four-digit hex number?
Convert the binary numbers in Problem 2-1 to hex.Data from problem 2-1Convert these binary numbers to decimal.(a)*10110(b) 10010101(c)*100100001001(d) 01101011(e)*11111111(f)
Convert the BCD number 011111000001 to its decimal equivalent.
An automatic teller machine (ATM) at the bank allows you to enter the amount of cash you wish to withdraw in decimal by pressing decimal digit symbol keys. Does the computer convert this decimal
List the hex numbers in sequence from 17516 to 18016.
When a large decimal number is to be converted to binary, it is sometimes easier to convert it first to hex, and then from hex to binary. Try this procedure for 213310 and compare it with the
Your cell phone allows you to enter/store a 10-decimal-digit phone number. Does the cell phone store the phone number in straight binary or BCD? Explain.
How many bytes are in a 32-bit string (a string of 32 bits)?
How many hex digits are required to represent decimal numbers up to 20,000? up to 40,000?
What is the largest decimal value that can be represented in binary using two bytes?
Convert these hex values to decimal.(a)*92(b) 1A6(c)*315A(d) A02D(e)*000F(f) 55(g)*2C0(h) 7F(i) 19(j) 42(k) CA(l) F1
How many bytes are needed to represent the decimal value 846,569 in BCD?
Convert these decimal values to hex.(a)*75(b) 314(c)*2048(d) 24(e)*7245(f) 498(g)*25,619(h) 4095(i) 95(j) 89(k) 128(l) 256
How many nibbles are in a byte?
Take each four-bit binary number in the order they are written and write the equivalent hex digit without performing a calculation by hand or by calculator.(a) 1001(b) 1101(c) 1000(d) 0000(e) 1111(f)
Use Table 2-5 to find the seven-bit ASCII code for the backslash character (\). TABLE 2-5 Standard ASCII codes. Character NUL (null) Start Heading Start Text End Text End
What is the hex value of the least significant nibble of the binary number 10010101?
Take each hex digit and write its four-bit binary value without performing any calculations by hand or by calculator.(a) 6(b) 7(c) 5(d) 1(e) 4(f) 3(g) C(h) B(i) 9(j) A(k) 2(l) F(m) 0(n) 8(o) D(p) 9
What is the largest value that can be represented by three hex digits?
Convert the hex values in Problem 2-11 to binary.Data from Problem 2-11Convert these hex values to decimal.(a)*92(b) 1A6(c)*315A(d) A02D(e)*000F(f) 55(g)*2C0(h) 7F(i) 19(j) 42(k) CA(l) F1
An operator is typing in a C language program at the keyboard of a certain microcomputer. The computer converts each keystroke into its ASCII code and stores the code as a byte in memory. Determine
List the hex numbers in sequence from 280 to 2A0.
Computers often communicate with other remote computers over telephone lines. For example, this is how dial-up communication over the internet takes place. When one computer is transmitting a message
How many hex digits are required to represent decimal numbers up to 1 million? 4 million?
Encode these decimal numbers in BCD.(a)*47(b) 962(c)*187(d) 6727(e)*13(f) 529(g)*89,627(h) 1024(i)* 72(j) 38(k)*61(l) 90
(a) Refer to Table 2-5. What is the most significant nibble of the ASCII code for the letter X?(b) How many nibbles can be stored in a 16-bit word?(c) How many bytes does it take to make up a 24-bit
How many bits are required to represent the decimal numbers in the range from 0 to 999 using (a) Straight binary code? (b) BCD code?
The following numbers are in BCD. Convert them to decimal.(a)*1001011101010010(b) 000110000100(c)*011010010101(d) 0111011101110101(e)*010010010010(f) 010101010101(g) 10111(h) 010110(i) 1110101
(a) How many bits are contained in eight bytes?(b) What is the largest hex number that can be represented in four bytes?(c) What is the largest BCD-encoded decimal value that can be represented in
Represent the statement “X = 3 × Y” in ASCII code. Attach an odd-parity bit.
Attach an even-parity bit to each of the ASCII codes for Problem 2-24, and give the results in hex.Data from problem 2-24Represent the statement “X = 3 × Y” in ASCII code. Attach an odd-parity
The following bytes (shown in hex) represent a person’s name as it would be stored in a computer’s memory. Each byte is a padded ASCII code. Determine the name of each person.(a) *42 45 4E 20 53
In a certain digital system, the decimal numbers from 000 through 999 are represented in BCD code. An odd-parity bit is also included at the end of each code group. Examine each of the code groups
Convert the following decimal numbers to BCD code and then attach an odd-parity bit.(a)*74(b) 38(c)*8884(d) 275(e)*165(f) 9201(g) 11(h) 51
Suppose that the receiver received the following data from the transmitter of Example 2-17:What errors can the receiver determine in these received data?Data from Example 2-17Computers often
Perform each of the following conversions. For some of them, you may want to try several methods to see which one works best for you. For example, a binary-to-decimal conversion may be done directly,
Represent the decimal value 37 in each of the following ways.(a) Straight binary(b) BCD(c) Hex(d) ASCII (i.e., treat each digit as a character)
Fill in the blanks with the correct word or words.(a) Conversion from decimal to ____________ requires repeated division by 16.(b) Conversion from decimal to binary requires repeated division by
Write the binary number that results when each of the following numbers is incremented by one.(a)*0111(b) 010011(c) 1011(d) 1111
Decrement each binary number by one.(a)*1100(b) 101000(c) 1110(d) 1001 0000
Write the number that results when each of the following is incremented.(a)*777916(b) 999916(c)*OFFF16(d) 200016(e)*9FF16(f) 100A16(g) F16(h) FE16
Repeat Problem 2-35 for the decrement operation.Data from Problem 2-35Write the number that results when each of the following is incremented.(a)*777916(b) 999916(c)*OFFF16(d) 200016(e)*9FF16(f)
In a microcomputer, the addresses of memory locations are binary numbers that identify each memory circuit where a byte is stored. The number of bits that make up an address depends on how many
In an audio CD, the audio voltage signal is typically sampled about 44,000 times per second, and the value of each sample is recorded on the CD surface as a binary number. In other words, each
A black-and-white digital camera lays a fine grid over an image and then measures and records a binary number representing the level of gray it sees in each cell of the grid. For example, if four-bit
A 3-Megapixel digital camera stores an eight-bit number for the brightness of each of the primary colors (red, green, blue) found in each picture element (pixel). If every bit is stored (no data
Construct a table showing the binary, hex, and BCD representations of all decimal numbers from 0 to 15. Compare your table with Table 2-4.Table 2-4.
List three advantages of digital techniques.
What is the decimal equivalent of 11010112?
How is an analog signal represented in a digital system?
Describe the relative advantages of parallel and serial transmission of binary data.
Fill in the blank.A nonmemory circuit output always depends on the __________ input (past present, or future).
Name the five major functional units of a computer.
In Figure 1-22a, what is the logic level that must be output to turn on the LED?Figure 1-22a +V S1 S2 (a)
Which of the following involve analog quantities and which involve digital quantities?(a) Elevation using a ladder(b) Elevation using a ramp(c) Current flowing from an electrical outlet through a
What are the two numeric digits used to represent states in a digital system?
Draw a timing diagram showing when a person is “on duty” over an entire week. Begin on Monday morning. The diagram will have one input representing the day/night cycle (assume equinox where
True or false: The exact value of an input voltage is critical for a digital circuit.
Which method of representing quantities involves discrete steps?
List the two primary limitations of digital techniques.
What is the next binary number following 101112 in the counting sequence?
Fill in the blank.A memory circuit output depends on ___________.
Which two units make up the CPU?
What is the largest number that can be represented using eight bits?
In Figure 1-22b, what is the logic level that must be output to turn on the LED?Figure 1-22b S1 +V S2 (b) +V
What are the two terms used to represent the two logic levels?
Is the “on_duty” waveform in the diagram from the previous question periodic or aperiodic?Data from Previous QuestionDraw a timing diagram showing when a person is “on duty” over an entire
Can a digital circuit produce the same output voltage for different input voltage and current values?
Which method of representing quantities is continuously variable?
What is the largest decimal value that can be represented using 12 bits?
In Figure 1-22a, which switch must be closed to turn on the LED?Figure 1-22a +V S1 S2 (a)
What is the primary strategy of improving the capabilities, speed, and throughput of computer systems?
Refer to Figure 1-11(a) Is the input waveform periodic?(b) What is the period of the input waveform in sec?(c) What is the active-HIGH duty cycle of the input waveform?(d) What is the frequency of
What is the abbreviation for binary digit?
Fill in the blanks.A digital circuit is also referred to as a ___________ circuit.
Identify each as digital or analog representation:(a) Time of day using a sundial(b) Time of day using your cell phone(c) Volume level of your flat-screen television(d) Volume level of vacuum tube
In Figure 1-22b, which switch must be closed to turn on the LED?Figure 1-22b S1 +V S2 (b) +V
What category boasts the largest number of computer applications?
Which binary digit value is typically represented by low (near-zero) voltage?
Fill in the blanks.The most prevalent technology used for digital circuits today is abbreviated ___________.
If you discover the greatest invention of the twenty-first century, what technology will almost certainly be involved?
Create a good label (name) for each signal described below:(a)*A sensor outputs a LOW when the elevator door is closed(b) A streetlight sensor outputs a HIGH when it detects daylight(c)*A passenger
What voltage represents the binary digit value of 1?
Fill in the blanks.This acronym stands for _____ ____ _____ ______ .
Draw two cycles of the timing diagram for a digital signal that continuously alternates between 0.2 V (binary 0) for 2 ms and 4.4 V (binary 1) for 4 ms.
Which logic level is typically assigned a value of 1?
Fill in the blanks.Legacy systems of the past used a technology abbreviated as __________.
What is the logic level produced in Figure 1-4(a) when the key is removed?Figure 1-4a +12 V 0 V Key_inserted 0 V; Low; '0': False (a)
Measure the period, frequency, and duty cycle of the waveform in 1-6. Assume the active part of the waveform is HIGH.Data from 1-6Draw two cycles of the timing diagram for a digital signal that
Fill in the blanks.The type of transistor used in legacy systems was the ____________ transistor.
According to Figure 1-5, what is the lowest voltage that would be recognized as a logic 1?Figure 1-5. 5 V 2 V 0.8 V OV Binary 1 Invalid voltages Binary 0 (a) Not used 4 V Ing (b) Volts
Draw two cycles of the timing diagram for a signal that alternates between 0.3 V (binary 0) for 5 ms and 3.9 V (binary 1) for 2 ms.
According to Figure 1-5, what is the highest voltage that would be recognized as a logic 0?Figure 1-5. 5 V 2 V 0.8 V OV Binary 1 Invalid voltages Binary 0 (a) Not used 4 V Ing (b) Volts
Measure the period, frequency, and duty cycle of the waveform in 1-8. Assume the active part of the waveform is LOW.Data from 1-8Draw two cycles of the timing diagram for a signal that alternates
Label each waveform in Figure 1-23: periodic/aperiodic. For those that are periodic, measure T, F, and duty cycle (assume active HIGH).Figure 1-23 0 0 1 0 0 1 2 3 4 5 6 7 8 I 1 9 10 11 μs

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