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Ram and Rom

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MEMORY PCs have quite a bit of memory of different kinds. Let’s take a look at some general concepts that will help us understand what we are talking about when we say “memory.” Storage One of the things we expect our PCs to do is to store information. This information can be our data files, it can be our application software, or our operating system. If this information were not stored in the PC itself, we would have to re-install it every time we turned on the PC, and then it would have to be stored or kept somewhere while it was being used, as well. So right here we can see that there are two kinds of storage – short-term or temporary, and long-term or permanent. Permanent storage is the kind where the information will be …show more content…

RIMM modules must be mounted into RIMM slots on the motherboard – they cannot be used on motherboards that support DIMMs. Each socket must be filled on a RIMM slot motherboard. If a slot does not contain a RIMM, then it must have a place-holder module known as a CRIMM or continuity RIMM. These have no memory modules – they are just there to make sure that data flows from the RIMMs to the frontside bus. This is licensed technology and manufacturers must pay a fee to use Rambus RIMMs on a motherboard. Most are reluctant to do so, and this technology is becoming another legacy technology. DDR 2 SDRAM is currently the most common type of RAM. It is faster than DDR, uses less power, and comes on a 240 pin DIMM with a 64-bit data path. DDR3 SDRAM is the latest SDRAM upgrade, specifically for support of dual and quad core processor systems. It supports frontside bus speeds of 800 MHz to 1600 MHz. The data path is 64 bits wide and the sticks have 240 pins. But they are keyed (notched) differently than DDR2 sticks, and can't be used on motherboards with DDR2 RAM slots. SDRAM is also used for laptop memory, in the form of SO-DIMMs (small outline DIMMs). These more compact RAM strips have, depending on the technology, 144, 172 or 200 pins. Counting RAM All RAM counts are in units of 1024 bytes, so 1 MB is 1024 bytes, 32 MB is 32768 and so on. Round to the closest even number that is a multiple of 8 as RAM amounts range from 16, 32, 64, 128MB to 256, 512 MB, to 1024 MB (1 GB),

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