Operating System Zoo

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Operating System Zoo

• ITFN 2601Developing OSCh 1.1 1.3

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Todays Schedule

• What is an O/S?
• What is Computer System?
• Types of O/S
• History of O/S
• Assignment 1 is posted, Due Wed., Jan 17, at
  1130 pm

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Teams looked at OS functions
Figure 1.1 Model of a non-networked operating
system
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Backup Where is OS in Computer System?

• A computer system consists of
• hardware
• system programs
• application programs

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O/S Placement
Applications (Word, IE, Games, etc.)
User
Low-level apps (compilers, interpreters, editors)
Operating System
Machine Language (Binary)
Machine
Microarchitecture (processor-level)
Physical Devices (Hardware)
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OS Defined

• Extended Machine
• Service provider for hardware
• Abstracts the details of the machine
• Provides an API (system calls) to user
• Resource Manager
• Multiple users, multiple resources
• Orderly, controlled allocation of resources
• Fairness, protection, space-time, etc.
• Each program gets time with the resource
• Each program gets space on the resource

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Flavors of OS

• Mainframe
• Server
• Multiprocessor
• Personal Computer
• Real-Time
• Embedded
• Smart Card

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Mainframe OS

• High-end I/O capacity
• 1000 disks
• Gigabytes of data
• High-end web servers
• B2B (business to business) E-commerce
• High-speed VR/FMV Rendering
• Many small, simultaneous jobs

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Server OS

• Large personal computers (kahuna, zidane, etc.)
• Print, file servers for small businesses
• Web servers
• Can load balance these to increase performance
• UNIX, Linux, Win2000 Server OS

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Multiprocessor OS

• Connect multiple computers together
• Share/distribute jobs among multiple
  machines/processors
• Specialized protocols for managing communication
• Win2000 Advanced Server

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Personal Computer OS

• Focus on single user, multiple jobs
• What youre running on your machine
• Win9x, Win2000 Pro, Linux, Mac OS

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Real-Time OS

• Time requirement dominates these machines specs
• Data collection from production lines, factory
  machinery
• Hard real-time time critical in all instances
• Soft real-time OK to drop occasionally

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Embedded OS

• Personal Digital Assistants
• TVs, microwaves, mobile phones
• Very small OS, embedded on chip
• PalmOS, WinCE

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Smart Card OS

• Credit card sized devices
• Specialized OS for specialized purposes
• E-payment cards (e-cash cards)
• Some JVM coming into play

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Historical Development of Operating Systems

• Follows H/W and S/W development
• User needs

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History of Operating Systems

• First generation 1945 1955
• vacuum tubes, plug boards
• Second generation 1955 - 1965
• transistors, batch systems
• Third generation 1965 1980
• ICs and multiprogramming
• Fourth generation 1980 present
• personal computers

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Why look at History?

• Each new computing species seems to go through
  the development of its ancestors.
• Programming Languages
• Operating Systems
• Disk Storage
• Virtual Memory

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Team makes timeline of one!

• First generation 1945 1955 (Team 1)
• vacuum tubes, plug boards
• Second generation 1955 1965 (Team 2)
• transistors, batch systems
• Third generation 1965 1980
• ICs and multiprogramming (Team 3 p 9-10 360)
  (Team 4 p 10-11 Multics) (Team 5 p 12 -13)
• Fourth generation 1980 present
• personal computers (Team 6 p 13-15 to Steve Jobs)
  (Team 7 p 15 -16 When MS, pargh 3)

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For your homework,Metric Units, Page 66 in text
The metric prefixes
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Assignment for Tuesday, January 16

• Read Chapter 1,
• Sections 1.4 1.5
• Sections 1.9, 1.10, 1.11
• Assignment 1 is posted, Due Wed., Jan 17, at
  1130 pm
• Bring questions for discussion