Transcript Component_of_System_Unit

Pengantar Teknologi Informasi
The Components of
the System Unit
Memory
What is memory?
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Electronic components that
store instructions, data, and
results
Terdiri dari satu atau lebih
chips pada motherboard atau
circuit board lainnya
Setiap byte disimpan di lokasi
yang unik yang disebut
alamat, mirip dengan kursi di
kereta penumpang
Seat #2B4
Seat #2B3
Memory
How is memory measured?
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By number of bytes available for storage
Term
Abbreviation
Approximate Size
Kilobyte KB or K 1 thousand bytes
Megabyte MB
1 million bytes
Gigabyte
GB
1 billion bytes
Terabyte
TB
1 trillion bytes
Memory
What is random access memory (RAM)?
Memory chips that can be
read from and written
to by processor
Also called
main memory
or primary
storage
Most RAM is
volatile, it is lost
when computer’s
power is
turned off
The more RAM a
computer has, the
faster it responds
Memory
How do program instructions transfer in and out of RAM?
RAM
Operating system
instructions
Operating system
interface
Step 1. When you start the computer, certain
operating system files are loaded into RAM from
the hard disk. The operating system displays the
user interface on the screen.
Step 2. When you start a Web browser, the
Web browser
instructions
Web browser
window
program’s instructions are loaded into RAM from
the hard disk. The Web browser window is
displayed on the screen.
Step 3. When you start a word processing
Word processing
program instructions
Word processing
program window
program, the program’s instructions are loaded
into RAM from the hard disk. The word
processing program, along with the Web Browser
and certain operating system instructions are in
RAM. The word processing program window is
displayed on the screen.
RAM
Step 4. When you quit a program, such as the
Web browser, its program instructions are
removed from RAM. The Web browser no longer
is displayed on the screen.
Web browser program
instructions are
removed from RAM
Web browser
window no longer is
displayed on
desktop
Memory
What are two basic types of RAM chips?
Most
common
type
Faster
variations
of DRAM are
SDRAM and
RDRAM
Dynamic
RAM
(DRAM)
Static
RAM
(SRAM)
Used for
special
applications
such as
cache
Faster and
more reliable
than DRAM
chips
Future: Magnetoresistive RAM (MRAM)
Memory
dual inline memory module
Where does memory reside?
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Berada pada papan sirkuit
kecil yang disebut modul
memori
Slot memori pada motherboard
memegang modul memori
memory chip
memory slot
Memory
How much RAM does an application require?
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paket perangkat lunak
biasanya menunjukkan
persyaratan RAM
Untuk kinerja yang
optimal, Anda
membutuhkan lebih dari
spesifikasi minimum
System Requirements
Windows® XP Home Edition/Professional
• Intel Pentium processor at 233MHZ or higher
• AMD K6 (Athlon Duron Family processor at 233MHZ or higher
• 64 MB of RAM
Memory
How much RAM do you need?
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Depends on type of applications you intend to run
on your computer
RAM
Use
128 to 256 MB
• Home and business
users managing
personal finance
• Using standard
application software
such as word processing
• Using educational
or entertainment
CD-ROMs
• Communicating with
others on the Web
256 to 1 GB
• Users requiring more advanced
multimedia capabilities
• Running number-intensive
accounting, financial, or
spreadsheet programs
• Using voice recognition
• Working with videos, music, and
digital imaging
• Creating Web sites
• Participating in video conferences
• Playing Internet games
1 GB and up
• Power users creating
professional Web sites
• Running sophisticated
CAD, 3D design, or
other graphics-intensive
software
Memory
What is cache?
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Membantu proses kecepatan komputer dalam menyimpan
instruksi dan data yang sering digunakan
Also called memory cache
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L1 cache built into processor
L2 cache lebih lambat tapi memiliki
kapasitas yang besar
L3 cache terpisah dari chip prosesor
pada motherboard (L3 hanya pada
komputer yang menggunakan L2 cache
transfer lanjutan)
Memory
What is read-only memory (ROM)?
Memory chips that store
permanent data
and instructions
Nonvolatile memory, it is not
lost when computer’s
power is turned off
EEPROM
(electrically
Three types:
erasable programmable
read-only memory)—
Firmware—
Type of PROM
Manufactured with
containing microcode
PROM
permanently written
programmer
data, instructions, (programmable
can erase
read-only
or information
memory)—
Blank ROM
chip onto which
a programmer
can write permanently
Memory
What is flash memory?
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Nonvolatile memory that can be erased electronically and
reprogrammed
Used with PDAs, digital cameras, digital cellular phones, music players,
digital voice recorders, printers, Internet receivers, and pagers
Step 3.
Step 1.
Purchase and download MP3 music tracks
from a Web site. With one end of a special
cable connected to the system unit, connect
the other end into the MP3 player.
Flash memory chip
To headphones
Plug the headphones into the MP3
player, push a button on the MP3
player, and listen to the music
through the headphones.
From computer
Flash memory card
Step 2.
Instruct the computer to copy the MP3 music track
to the flash memory chip in the MP3 player.
MP3 Player
Memory
What is CMOS?
Complementary
metal-oxide
semiconductor
memory
Uses battery
power to retain
information when
other power is
turned off
Used in some
RAM chips, flash
memory chips, and
other types of
memory chips
Stores date,
time, and
computer’s
startup
information
Memory
What is access time?
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Jumlah waktu yang dibutuhkan prosesor
untuk membaca data dari memori
Diukur dalam nanodetik (ns), salah satu
miliar detik
Dibutuhkan 1 / 10 dari satu detik untuk kedipan
mata Anda, komputer dapat melakukan hingga
10 juta operasi dalam jumlah waktu yang sama
Term
Millisecond
Microsecond
Nanosecond
Picosecond
Speed
One-thousandth of a second
One-millionth of a second
One-billionth of a second
One-trillionth of a second
Expansion Slots and Adapter Cards
Types of Adapter Cards
What is an adapter card?
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menyediakan koneksi ke
perangkat eksternal yang disebut
peripheral
Juga disebut kartu ekspansi
Expansion Slots and Adapter Cards
What is an expansion slot?
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socket, pada
motherboard yang
dapat memegang
kartu adaptor
Dengan Plug and Play,
komputer secara
otomatis
mengkonfigurasi kartu
dan perangkat lain
ketika Anda
menginstal mereka
Expansion Slots and Adapter Cards
What are PC cards and flash memory cards?
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Kartu PC menambah memori,
penyimpanan, suara, faks / modem,
komunikasi, dan kemampuan lain
untuk komputer notebook
A flash memory card allows users
to transfer data from mobile
devices to desktop computers
Ports and Connectors
What are ports and connectors?
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Port connects external devices to system unit
Connector joins cable to peripheral
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Available in one of two genders: male and female
Ports and Connectors
What are different types of connectors?
Ports and Connectors
What is a serial port?
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Transmits one bit of data at a
time
Connects slow-speed devices,
such as mouse, keyboard,
modem
Ports and Connectors
What is a parallel port?
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Connects devices that can
transfer more than one bit at
a time, such as a printer
Ports and Connectors
What are USB ports?
USB (universal serial bus) port can connect
up to 127 different peripherals together
with a single connector type
PCs typically have
four to eight USB ports
on front or back of
the system unit
Third USB
device connects
to second USB
device, and so on
Single USB port can
be used to attach
multiple peripherals
in a daisy chain
First USB
device connects
to USB port
on computer
Second USB
device connects
to first USB
device
Ports and Connectors
What are special-purpose ports?
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Allow users to attach specialized peripherals (digital video
cameras, color printers, scanners, and disk drives) or
transmit data to wireless devices
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FireWire port
MIDI (Musical
Instrument Digital
Interface) port
SCSI (small
computer system
interface) port
IrDA (Infrared Data
Association) port
Bluetooth port
Buses
What is a bus?
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Channel that allows devices
inside computer to
communicate with each other
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System bus connects processor
and RAM
Bus width determines number
of bits transmitted at one time
Word size is the number of
bits processor can interpret
and execute at a given time
Buses
What is an expansion bus?
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Allows processor to communicate with peripherals
Bays
What is a bay?
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Open area inside
system unit used
to install
additional
equipment
Drive bays
typically hold disk
drives
Power Supply
What is a power supply?
Converts
AC Power
into
DC Power
Fan keeps
system unit
components
cool
External peripherals
might use an AC
adapter, which is an
external power supply
Mobile Computers and Devices
What is a mobile computer?
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Notebook, weighing between 2.5 and 8 pounds, or
mobile device such as a PDA
flash memory card
PDA
PC Cards in
PC Card slots
CD or DVD drive
disk in floppy
disk drive or
Zip® disk drive
battery
notebook computer
Mobile Computers and Devices
What is in the system unit of a mobile computer?
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Motherboard,
processor, and
memory—also
devices such as the
keyboard, speakers,
and display
Mobile Computers and Devices
What ports are on a notebook computer?
Mobile Computers and Devices
What ports are on a tablet PC?
Putting It All Together
What are suggested processor, clock speed, and RAM
requirements based on the needs of various types of users?