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Background of the AS400

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Many customers preferred to stay with system/36 rather-than System/38 ... ASCII - American Standard Code for Information Interchange ... – PowerPoint PPT presentation

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Title: Background of the AS400


1
Chapter 1
  • Background of the AS/400

2
IBM Midrange Background
  • Began June 1969
  • System 3/x
  • Rochester, MN
  • Punch card design
  • Target low-end commercial small-size batch

3
System 3/x Line
  • System 3/x Midrange line
  • Small, efficient computer
  • Single computer model - standard

4
System/34
  • System/34
  • April 1977
  • First multi-user minicomputer
  • Low-cost computer

5
System/38
  • System/38
  • 1975 research project
  • 1978 announced
  • Machine independence
  • New processor
  • User needed to upgrade
  • First time contained a relational database
  • Object-based architecture
  • Ahead of times

6
System/36 Upgraded Models
  • System/36 upgraded
  • Many customers preferred to stay with system/36
    rather-than System/38

7
AS/400 History
  • Project SilverLake
  • 1985 started research
  • New machine
  • Successor to System/38
  • New future machine

8
AS/400 History - Continue
  • Application System/400 (AS/400)
  • June 1988 announced
  • Improving at about 10 per year
  • Hardware independent untested until 1995
  • CISC (Complex Instruction Set Computer)
  • Instruction length variable

9
AS/400 History - Continue
  • Upgrading
  • RISC (Reduced Instruction Set Computer)
  • Equal instruction length
  • From 48-byte to 64-byte word size
  • True hardware independence

10
AS/400 History - Continue
  • Enhanced Series or e-series
  • 1994 development began
  • Foresaw potential of Internet
  • Announced August1997
  • New n-way processors up to 12-way
  • First package machine
  • A server configured and preloaded with SAP
    software

11
Layered Design Concept
  • Layered Architecture
  • Distinguished from traditional computers
  • Key to machine independence

12
(No Transcript)
13
Data Storage and Objects
  • Object-based computers
  • Everything stored on an AS/400 is an stored as
    an object
  • Objects stored in Libraries
  • Data stored as
  • EDCDIC - Extended Binary Coded Decimal
    Interchange Code
  • ASCII - American Standard Code for Information
    Interchange

14
Single-level Storage
  • No distinction between disk storage and main
    memory
  • One large storage area (single address space)
  • Memory
  • DASD
  • Object must be in memory to use or operate on

15
Single-level Storage
  • Automatic divides object into blocks - pages
  • Virtual storage

16
Software
  • Operating System
  • Application Programs
  • Job/Program types
  • Interactive
  • Batch
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