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Computer Memory - The Different Types

In this article we're going to review theExtended Data Out Dynamic Random Access
different types of computer memory as they doMemory. This is very fast memory which
not all function the same way.The most commondoesn't wait until processing of the first
and most often used computer memory is yourbit is completed before moving on to the next
RAM which stands for Random Access Memory.bit. Then we have SDRAM, which is
Random Access Memory is considered randomSynchronous Dynamic Random Access Memory.
access because you can access any cell of theThis type of memory takes advantage of the
memory at any time for any piece offact that in most cases the data that needs
information either for retrieval or storageto be accessed is sequentially stored and
if you know the row and column that intersecttherefore using a very fast method of
at that cell. For example: let's say we areaccessing this memory. The rate of this
working within an Excel spreadsheet and wememory is about 528 Mbps, which is extremely
want to change the value in cell A1 from 100fast.The opposite of RAM is SAM, or
to 90. In order to do this the computer hasSequential Access Memory. This is memory
to know where on the RAM chip that cell'sthat has to be accessed in sequence, one cell
contents are located. Fortunately for theat a time until the location the user is
user, it does and the user doesn't have to.looking for is found. This memory is very
Once the change is made the computer replacesgood for buffer memory because items stored
the contents in RAM, which was the value 100,in the buffer are usually stored sequentially
with the new value of 90 and leaves it inanyway as the user continues his work. SAM
that location until the user decides tois slower than RAM as far as access time
change the value again or closes up thegoes.Another type of memory is what is known
spreadsheet itself. Once that happens, theas ROM or Read Only Memory. Read Only Memory
contents in RAM of that particular locationis also known as Firmware. This is an
are lost. Hopefully before doing this theintegrated circuit programmed with certain
user will have saved his spreadsheet to hisdata when it is manufactured. ROM is not
computer's hard drive.RAM can also be brokenonly used in computers but in a number of
down into different types. First there iselectronic devices like your Xbox or any
SRAM, which is Static Random Access Memory.video game console box. Without ROM just
This type of memory is usually used for aabout any electronic item today that has
computer's cache memory. Then there is DRAM,built in functions simply wouldn't work.There
which is Dynamic Random Access Memory. Thisare many other different types of memory but
type of memory has memory cells with a pairedthese are the most common. In future
transistor and capacitor which need constantarticles we'll go more deeply into how memory
refreshing. Then there is EDO DRAM which isin your computer and other devices works.



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