Stuff you can touch and feel
• Input devices
• Keyboard, mouse, digital camera, mic
• Output devices
• Monitor (screen), printer, projector, speakers
• Processor - CPU/Microprocessor
• Intel Pentium
• Storage devices
• Hard drive, CDROM, DVD, floppy
• Memory / RAM
• Bus
• Connects the internal components of a personal computer

Users
Input
Output
Processor
Memory
Storage

• The Operating System
– Microsoft Windows
XP , NT, 2000, 95, 98
– Unix / Linux / Solaris
– Macintosh
• Application Software
– Word processor, spreadsheet, database
– Games, browser, image software, music software

• The “brains” of the computer
• Intel Pentium 4 is currently the most popular
• Current speeds 1.5 – 3.0 GHz (Giga Hertz)
– A Giga Hertz is a billion cycles per second.
• Others include:
• Intel Pentium, Celeron, Itanium, Xeon; AMD Athlon, Duron
• Motorola PowerPC
• Older ones include:
• Intel 8080, 286, 386, 486, Pentium I, II, III

• Used for fast but temporary storage for what the computer is currently working on.
• The info goes away when the power goes away.
• Most computers today have 128 – 512
Megs (Mega Bytes) of RAM.

• Hard drive
• CDROM
10-100 Gigs
640 Megs (Read Only)
– CD-R
– CD-RW
(Write Once)
(Read/Write)
• DVD 4-16 Gigs
• Flash Cards
4 Megs – 1 Gig
Used for digital cameras and MP3 players
• Floppy
1.4 Megs
Fast
Slow / Cheap