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Sansung Galaxy Note 8 - Unboxing

September 27, 2017

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Priority Interrupts | (S/W Polling and Daisy Chaining)

Priority Interrupts | (S/W Polling and Daisy Chaining) To summarize, when I/O devices are ready for I/O transfer, they generate an interrupt request signal to the computer. The CPU receives this signal, suspends the current instructions it is executing and then moves forward to service that transfer request. But what if multiple devices generate interrupts simultaneously. In that case, we have to have a way to decide which interrupt is to be serviced first. In other words, we have to set a priority among all the devices for systemic interrupt servicing. The concept of defining the priority among devices so as to know which one is to be serviced first in case of simultaneous requests is called priority interrupt system. This could be done with either software or hardware methods. SOFTWARE METHOD – POLLING In this method, all interrupts are serviced by branching to the same service program. This program then checks with each device if it is the one generating th...

How to convert a PDF to JPG for easy viewing on any device

How to easily convert a PDF to JPG for easy viewing on any device.... There are plenty of worthwhile reasons to convert a Portable Document Format (PDF) to a JPG image (it’s different from a GIF, you know). Although PDF files are a fantastic way to package a slew of text and image documents together, they often require an external application or plug-in and are unnecessary if you want just a single page or image. But to make that transition, you need to know how to convert a PDF to JPG. There Are Many Different Ways To Do This , But My Favorite Method using Zamzar — Free web tool Online tools can typically be used from any computer or mobile device. Since they don’t take up any room on your computer and tend to be speedy little converters, you may prefer them to other options. Their only downside is that they tend to be a little limited in the amount of data you can convert at one time, which makes them difficult to use for larger PDF files. Still, they can be a useful tool...

Bus and Memory Transfers

BUS If a computer has 16 registers, each holding 32 bits, how many wires are needed to connect every register to every other? (16 2 ) For a large number of wide registers, the wires could end up taking most of the space in the circuit. A BUS is a single shared set of wires connecting all registers. Memory Transfer The internal bus connects only registers within the CPU, so how do we get data to and from memory? The address register (AR) is used to select a memory address, and the data register (DR) is used to send and receive data. Both these registers are connected to the internal bus. DR is a bridge between the internal BUS and the memory data BUS. Memory can also be connected directly to the internal BUS in theory. Diagram showing connections to memory unit. M[AR] ← DR DR ← M[AR] Hence, accessing memory outside the CPU requires at least two clock cycles. First we load AR with the desired memory address, and then transfer to or from ...

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Sansung Galaxy Note 8 - Unboxing

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