web analytics

Author name: Tanmay Chakrabarty

Tanmay Chakrabarty is a professional web application developer working professionally for 7+ years with experience in both local and global projects. He likes to share helpful contents such as Q/A, development tutorial etc. on this blog.

Draw the pin-out diagram of 82C55A PPI. How many modes you can select on 82C55A PPI? Explain.

Pin-Out Diagram of 82C55A: I/O Ports: It has three I/O ports, A, B and C. Each of these has 8 pins.             CS : This is used to select the 82C55A for programming and reading or writing.             A0 & A1: Register selection is done using the A0 and A1, which select …

Draw the pin-out diagram of 82C55A PPI. How many modes you can select on 82C55A PPI? Explain. Read More »

What is handshaking? Write a suitable example for handshaking with necessary assembly codes.

Handshaking:  Handshaking is a I/O control method to synchronize I/O devices with the microprocessor. As many I/O devices accepts or release information at a much slower rate than the microprocessor, this method is used to control the microprocessor to work with a I/O device at the I/O devices data transfer rate. Example:  Supposing that we …

What is handshaking? Write a suitable example for handshaking with necessary assembly codes. Read More »

Write the differences between Isolated I/O and Memory Mapped I/O.

Memory Mapped I/O and Isolated I/O are two methods of performing input-output operations between CPU and installed peripherals in the system. Memory mapped I/O uses the same address bus to connect both primary memory and memory of hardware devices. Thus the instruction to address a section or portion or segment of RAM can also be used to address …

Write the differences between Isolated I/O and Memory Mapped I/O. Read More »

Define port? Differentiate fixed port addressing and variable port addressing.

          Port : A port is an adapter which enables a system to communicate with its input/output devices. Using port user can connect I/O devices and use them. There various types of port such as parallel port, serial port etc.             Differences Between Fixed Port and Variable Port Addressing : Fixed Port …

Define port? Differentiate fixed port addressing and variable port addressing. Read More »

Write about hamming technique of error detection and correction in the case of a 4-bit data.

Hamming Technique (7,4) : In this case, we will have 4 bits of data and we will add 3 bits of redundant with the data by calculating the 4-bit data. For example, taking a 4-bit data as, The encoder will encode the data as follows , Thus the decoder will receive, 0 1 1 0 …

Write about hamming technique of error detection and correction in the case of a 4-bit data. Read More »

Write about a way to detect error./a single bit error/Write about parity check method.

Error Detection or Parity Check Method : A general way to detect errors is to append a special bit to every word. One popular technique employs a single check bit called parity bit. The parity bit is append to an n-bit word X = x0, x1,….., xn-1  to form the (n+1)-bit word X* = x0, x1,….., …

Write about a way to detect error./a single bit error/Write about parity check method. Read More »

What is error? Define error detection and correction.

Error: Various factors like manufacturing defects to environmental effects cause errors in computation. Such errors frequently appear when information is being transmitted between two relatively distant points within a computer or is being stored a memory unit. Shortly, error is missing of bit or bits in data due to change and various effects. Error Detection: …

What is error? Define error detection and correction. Read More »

Compare among different types of memory devices in terms of performance and costs

Comparing Different Types of Memory Devices in Terms of Cost & Performance: The best way to measure the cost of a memory device is the purchase price of a complete unit of its. Let C be the price in dollars of a complete memory system with S bits of storage capacity. The cost c of …

Compare among different types of memory devices in terms of performance and costs Read More »

RSS
Follow by Email
Scroll to Top