Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
After going through details of device interfaces next point to be discussed is how the interface can be used to support I/O from devices. Binary information received from an external device is generally stored in memory for later processing. Information transferred from central computer in an external device initiates in memory unit. Data transfer between central computer and I/O devices can be handled in some modes. 3 techniques are possible for I/O operation. These are:
Figure below gives an general idea of these 3 techniques:
Figure: Overview of the three Input/ Output
In programmed I/O, I/O operations are fully controlled by processor. The processor executes a program which initiates, directs and terminate an I/O operation. It needs a little special I/O hardware however is quite time consuming for processor as processor has to wait for slower I/O operations to finish.
With interrupt driven I/O when interface decides that device is ready for data transfer it produces an interrupt request to the computer. Upon detecting external interrupt signal processor stops the task it was processing and branches to a service program to process I/O transfer and then returns to task it was initially performing that result in waiting time by the processor being reduced.
With both interrupt-driven and programmed I/O processor is responsible for extracting data from main memory for output and storing data in main memory during input. What about having a substitute where I/O device may directly store data or retrieve data from memory? This alternative is called direct memory access (DMA). In this mode I/O interface and main memory exchange data directly without involvement of processor.
Figure: Three techniques of I/O
explain the construction and working of calomel electrode
what is equivalence partition
Q. Show Arithmetic Subtraction? The subtraction can be done easily using 2's complement by taking 2's complement of value which is to be subtracted (inclusive of sign bit) and
Q. Illustrate what is the universal law of universal gravitation? Answer:- Declaration that any particle of matter in the universe attracts any other with a force varying
Why do you think you are asked to do valuation given an array of discount rates? a. Would it not be extra accurate to utilize, for intsnces , CAPM to calculate cost of equity
Explain the Features of Major scheduling algorithms. The Features of Major scheduling algorithms is given below: FCFS - i.e. First come first served scheduli
What are the types of Smart cards used in e-commerce? Generally there are 2 types of smart cards. Memory smart cards, which can be sighted as minuscule removable read/ write
Explain CMOS Inverter with the help of a neat circuit diagram. Ans: CMOS Inverter: The fundamental CMOS logic circuit is an inverter demonstrated in Fig.(a). For above
What is meant by context switch? Switching the CPU to another process requires saving the state of the old process and loading the saved state for the new process. This task i
In8085 are of the following statements is not true.A) Co-processor is interfaced in max mode. B) Co-processor is interfaced in MIN mode C )Co-processor is interfaced in max/min mod
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd