AS/400Features

Ease of Installation and Use

• System supplied menus enable a novice user to install and automatically configure the system and local devices

• Extensive online help text and context sensitive help is available with index search facility.

Virtual Memory Based System addressing scheme that allows external disk

storage to appear as main storage • Implemented as a combination of main

storage and secondary storage Logical storage available for each program or task irrespective of the size of real storage

• Introduced in AS/400 architecture to free the constraints imposed by the size of the main storage

Layered Machine ArchitectureIMPIMIAPI

High level of integration

Object Orientation

Singe Level Storage

Capability Based System

Hierarchy of MicroprocessorsThe N-Way microprocessor capability

Operating System - OS/400 Work, Query, Security ,

Communication, Network Management.

Utilities – SEU , SDA , RLU , PDM Database DB2/400

Multilingual Support

OS/400 CommandsCL interface – menu and

command lineCommand Verb + Noun

Comprehensive security to all system resources

• Minimal security• Password security• Resource security• Resource security and Operating

System Integrity• C2 level of security

SecuritySecurity

File SystemsIntegrated File

SystemTraditional File

system

Productive application development environment.

• Programmers menu• Application development toolset• Interactive debug

Other features

• System availability• Disk mirroring• Checksum protection• Journalling support• API support

ADVANTAGE AS/400

• High processing speed (100 to 750 MIPS - Million Instructions Per Second)

• Capacity to store and handle huge amounts of data

• Ability to run multiple applications simultaneously

• Support large number of users – 1 to 100 or even more

Strengths of IBM

• Hardware• Reliable• Meant for non-stop operation• Modular - easily expandable• Good connectivity with non-IBM systems

Strengths of IBM (Cont...)

• Software• Compatibility maintained from the oldest

to the latest OS and sub-systems• Older applications can run on the latest

OS• Excellent recovery features• Secure - no threat from viruses etc.• Keeps up with the connectivity features

of the hardware

IBM Terminology

IPL Initial Program Load - Boot the system (Loading the operating system(s) )

Sub-system A functional unit, such as database manager or user interface, which can run directly under the operating

SystemPanel [Group]/Map A physical screen of dataJob A background process, which

executes one or more programs in a particular sequence

ABEND ABnormal END of Task/Program/Job

Communications• System Network Architecture (SNA)

• 7 layered• Similar to OSI

• LAN is Token Ring configuration

• Supports X.25 protocol

• Also supports TCP/IP protocol

Database support• DB2 for OS/400 – Relational database

Management system• Support for SQL – Declarative referential

integrity and stored procedures.• Triggers• Two phase commit transaction

management• Data replication , multiple level

concurrency control , National language support

• ODBC and much more……

Programming languages

• CL the job control language• RPG/400 Report program

generator• COBOL/400 Common business

oriented language

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