Computer Software

1
Computer Software

• Operating Systems

2
Operating System (OS)

• Software that controls the computers functions
• Can be stored on a chip (Pocket PC)
• Can be stored on the hard drive
• Called a platform
• Different sized computers use different OS

3
Boot Up

• Starting a computer
• Cold Boot
• Starting a computer that is turned off
• Warm Boot
• Restarting a computer that is on
• CTRLALTDEL
• Using a Windows option

4
Boot Up Sequence

• Press power button
• BIOS chip tells computer time, date and other
  info.
• Computer checks all parts inside and out
  Called POST (Power On Self Test)
• BIOS looks for files on floppy, then CD then hard
  drive

5
Boot up (cont)

• 5. Main files for Operating System load up in RAM
• Called the kernel
• 6. OS loads configuration files
• 7. Shows Windows Desktop

6
(No Transcript)
7
What the OS does

• Manages programs
• Manages memory
• Configures devices
• Monitors the system
• Manages files
• Manages hard drive

8
Types of Operating Systems

• Disk Operating System (DOS)

9
Windows

• Windows 3.1 1990
• Windows NT 1993
• Windows 95 1995
• Windows 98 1998
• Windows ME 2000
• Windows 2000 2000
• Windows XP 2001

10
Windows

• All versions of Windows made computers easier to
  use
• Provided a GUI (Graphical User Interface)

11
Other Operating Systems

• Mac OS X
• OS/2 Warp
• Unix
• Linux
• Windows CE

• 1984 Apple Computers
• IBM
• Unix 1970s Bell Labs
• 1991 Free
• Used in handheld computers

12
(No Transcript)