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37 Cards in this Set

  • Front
  • Back
PC has
modular architecture
diff modules can be integrated make compter caters to needs of individual
computer case
contains essentials of computerprotectying computer circuits cooling and providing organized layout to components
system board
base of comp
where you plug in processor memory cache video card network card other cards also connect peripherals directly or indirectly
chipset othere system board circuitry are
smarts of system board
job to control flow info inside comp
control processor's access to memory and flow of data to and from peripheral devices
chyipset critical because
determines features comp can support
type of processors types of memory plugged in speed can run typed of system bus
electrical channels various parts of comp
communicate visible part of bus is set of slots used for plugging in different cards video sound card
through system bus videio card gets
info from processor and processor saves data on hard disk
architecture of system bus has impact on performance
of computer affects choice of video cards and other devices
PSU power supply unit is
a small box inside computer case receives external power supplied to computer
main function of PSU
traqnsform power into 4 DC voltages the comp can use +5 -5 +12 -12
CPU central processing unit processor called
brain sopisticated piece miniaturized electronics reads instructions commands from memory processes instructions sends output back to user
RAM random access memory holds
all active info while using
when computer turned on RAM empty each program or data file uses part of main memory when you close program memory it occupies is available for other programs
system cache high-speed memory placed between
processor and RAM
accessing data from cache faster than RAM
cache memory speeds up system speed sisgnificantly
each time processor requests data first checks
cache if data available in cache processor avoids accessing main mem works sooner
computer's video card performs function of
displaying what you see on monitor inside video card special kind of memory called video mem info stored represents what's seen on screen dots or pixels
monitor is
specialized high-resolution screen
manytimes per second video card sends contents of its video mem to monitor
screen made up of matrix of
red green and blue dots info from video card controls intessity and color of dots
hard disk drive is
long term mem retains operating system programs data files even when power to comp is off
hard drives fastes form of
long-term storage or secondary storage comp uses
hard disks increased in capacity and speed hard discks perm installed they
stay in one place in shell cannot beremoved like cd-roms
non-removable storage devices
floppy disks smallest slowest form of long-term storage availabe provide simpleconvenient way to
transfer info intstall new software back up small files
advantage universality all used 1.44MB floppy drive
compact disk- read only memory CD-ROM storage device stores data CD-ROMs can read info but
not write to them
cd-roms popular medium for
games storing multimedia info video music large graphics files
connect external devices to comp to
enhace comp capabitlites
two primary tpyes of connections are

serial interface
parallel interface
serial connectionsends
info one bit at time simple way to send info speeds slow used for mice and modems
parallel connection faster than serial sends 8 bits in parallel disadvantage is
signal carries over smaller distances used with printers removable storage drives
devices in comp communicate by
system resources are not physical devices but determin how computer organizes its accesss to memory areas and devices
resource conflicts might occur while assigning system resources to devices
4 types of
Interrupts IRQ
device requests attention from processor pusing interrupt requests each device has didfferent IRQ number conflict if 2 devices use same IRQ
Direct Memory Access DMA channel
some devices have ability to read from and write to system memory directly, these devices needs its own DMA channel
Input/Output Address I/O addresses devices exhange info with system putting data into specific mem addrresses the data is stored in
certain mem address until processor can deal with it
when info transferred from machine to device such as modem hard drive or printer it uses I/O addresses Each device needs own memory area
Memory Addresses similar to I/O addresses many devices use blocks of memory map hardware programs
BIOS code into mem or use mem area to hold temporary data they are using
System BIOS Basic Input/Output System computer program built into computer's hardware lowest-level program that
runs on computer acts as intermediary between system hardware and operating system
BIOS ensures
operating system does not have to be rewritten for machines use diverse internal hardware DOS will load on comp if BIOS compatible
BIOS allows you to set or modify parameters that control computer functions
you can use BIOS utility to
configure your machine you can tell BIOS what sort of hard drives you have so it knows how to access these hard drives
advances in tech comps smaller without
missing functionality portable notebooks and PDAs persosnal digital assistants
notebooks contain
keyboard pointing device and lcd screen