A lot of people today know how to use the computer, but their knowledge basically involves turning the computer on and off only. For you to use a computer, you simply need to find the power button to start it up, and learn how to shut it down after using it. While most people know how to use the computer, their knowledge ends there. Whenever a problem arises, like the screen freezes or a pop-up window randomly appears, people who have little knowledge about computers wouldn’t know what to do. Or they wouldn’t know when a virus is already causing problems to the computer unit.When you have no or little knowledge about fixing a computer unit, there’s no need to stress about it as there are a lot of companies out there that can help you fix the issue in the fastest possible time. Every concern that you have can be handled by these experts, whether it involves software or a hardware problem. Computer problems can be corrected through proper diagnosis and only experts can do that.Computer problems are caused by different reasons, which is why a diagnosis is needed before attempting to fix the unit. IT companies can help you resolve your problems by providing these helpful and important PC solutions:· Screen repair and replacement – you can always work with a cracked screen, but would it be comfortable? No matter how big or small the crack is on your screen, you’d want it replaced immediately. There are different sizes of screen and you have to find the one that fits your size right. A repair company can help you find the right screen size for your computer or even your gadget and replace it immediately.· Server management / Network management – when you own a business, this service is really beneficial to you. An expert technician can help you setup your IT department by providing state-of-the-art IT solutions and tools that can help your business become more competitive and productive.· Virus removal – installing antivirus software is not an assurance that your data is well protected at all times. There are viruses that appear out of nowhere and you won’t know that your computer is infected until the damage is done. An expert technician can provide you a security plan custom-made for your business’s needs.· Computer repair services – any computer will suffer from damages over time. Repairs will be necessary to ensure that the computer will continue its good performance. Sometimes, different parts of the computer or laptop need to be replaced. And you can find the right parts with the help of an expert. Replace your battery, keyboard, motherboard or upgrade your RAM to keep your computer up and running again.
We looked at the early digital computer memory, see History of the computer – Core Memory, and mentioned that the present standard RAM (Random Access Memory) is chip memory. This conforms with the commonly quoted application of Moore’s Law (Gordon Moore was one of the founders of Intel). It states that component density on integrated circuits, which can be paraphrased as performance per unit cost, doubles every 18 months. Early core memory had cycle times in microseconds, today we are talking in nanoseconds.You may be familiar with the term cache, as applied to PCs. It is one of the performance features mentioned when talking about the latest CPU, or Hard Disk. You can have L1 or L2 cache on the processor, and disk cache of various sizes. Some programs have cache too, also known as buffer, for example, when writing data to a CD burner. Early CD burner programs had ‘overruns’. The end result of these was a good supply of coasters!Mainframe systems have used cache for many years. The concept became popular in the 1970s as a way of speeding up memory access time. This was the time when core memory was being phased out and being replaced with integrated circuits, or chips. Although the chips were much more efficient in terms of physical space, they had other problems of reliability and heat generation. Chips of a certain design were faster, hotter and more expensive than chips of another design, which were cheaper, but slower. Speed has always been one of the most important factors in computer sales, and design engineers have always been on the lookout for ways to improve performance.The concept of cache memory is based on the fact that a computer is inherently a sequential processing machine. Of course one of the big advantages of the computer program is that it can ‘branch’ or ‘jump’ out of sequence – subject of another article in this series. However, there are still enough times when one instruction follows another to make a buffer or cache a useful addition to the computer.The basic idea of cache is to predict what data is required from memory to be processed in the CPU. Consider a program, which is made up of a series instructions, each one being stored in a location in memory, say from address 100 upwards. The instruction at location 100 is read out of memory and executed by the CPU, then the next instruction is read from location 101 and executed, then 102, 103 etc.If the memory in question is core memory, it will take maybe 1 microsecond to read an instruction. If the processor takes, say 100 nanoseconds to execute the instruction, it then has to wait 900 nanoseconds for the next instruction (1 microsecond = 1000 nanoseconds). The effective repeat speed of the CPU is 1 microsecond.. (Times and speeds quoted are typical, but do not refer to any specific hardware, merely give an illustration of the principles involved).