computer memory 101
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Computers and
memoryfrom www.jenepting.com
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Computers are a lotlike brains.
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Computers have
memory.Brains have memory.
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But computers dontremember things like
3rd grade teachers.
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Their memories
handle moretechnical things.
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Like all the filesyouve ever saved.
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Or how to start up.
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There are many typesof memory in
computers, but letsfocus on the three main
types:
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1. Disk memory
2. RAM (Random AccessMemory)
3. CPU Registers
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Disk Memory
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Another way to sayDisk Memory is
Hard Drive.
Youve heard of that!
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You may back up your
computer on a Hard Driveor remember seeing it in
your Finder.
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The Hard Drive is
where all your savedfiles live.
mynovel.doc
taxes.xls
presentation.ppt
MY HARD DRIVE
shoppinglist.txt
dogs.gif
finisheddesigns.psd
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Its also where all theprograms on your
computer are stored.
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Hard Drives have limited
space, so installing manyprograms may make it
slow.
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Luckily, you can get a
larger Hard Drive if youneed it.
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RAM(Random Access
Memory)
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s ow your compu ersaves information in theshort-term... but RAM
doesnt remember past areboot.
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A good example is how
your computer remembersthe placement of windows
on your screen.
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You probably know
that you can buy moreRAM for your
computer... but whywould you need to?
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More RAM allows
you to run moreprograms at the
same time.
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Or at least makes it
faster to do so.
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Lets say you open
Microsoft Word.
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saved your
document, itscontents are
saved in RAM(the
computersshort-term
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You can officially save the
document to your HardDrive, which makes it long
term.mynovel.doc
taxes.xls
presentation.ppt
MY HARD DRIVE
shoppinglist.txt
dogs.gif
finisheddesigns.psd
businessstuff.doc
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That way youll always
have your document,even if you reboot your
computer.mynovel.doc
taxes.xls
presentation.ppt
MY HARD DRIVE
shoppinglist.txt
dogs.gif
finisheddesigns.psd
businessstuff.doc
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Pretty easy, right?
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CPU Registers
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The last kind of basicmemory is CPU
Registers.
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I know that soundsintense.
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But its actually super-
easy to understand...almost so easy that its
hard!
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Imagine your friend
asks you to calculatethe price of two
items.
+=??
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The first item
costs $.89, hesays.
$.89
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A minute later, hesays The second
item costs $1
.09.
$1.09
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You have to figureout the total.
+=??$.89 $1.09
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I bet you didnt noticeit, but in the time it
took him to tell youthe second items
cost, you relied onyour memory!
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You had to remember$.89 for a whole minute.
$.89
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This kind of memory(which feels uber-
short-term) incomputers is called
CPU Registers.
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Again, youd neverhave to upgrade this
kind of memory. Itsjust another kind of
memory yourcomputer needs.
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So, to recap:
Disk Memory holds all the files and programsthat make your computer who it is.
RAM helps the computer do many things at thesame time, and it saves the short-term versionof files.
The CPU Registers help your computerremember what it has to do!
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ow youre a
computer memoryexpert!