Unit 3: Mainframe and MiniComputer Systems

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Unit 3 Mainframe and Mini-Computer Systems

• September 5, 2000

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Historical Perspectives

• Charles Babbage Difference Engine
• Lady Ada Programming
• Mechanical Tabulating Equipment
• Hollerith the 1890 census
• National Cash Register
• International Business Machines

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Original Modern Computer

• 1940s von Neumann
• Electronic Tubes Relays
• Programmable
• Branch-able
• ENIAC (experimental)
• Sperry UniVac (1950s)
• Data Processing (1960s)
• Sorting, Adding, Printing
• Punch Card Systems

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Terms to Understand

• Hollerith Code
• Keypunch
• Unit Record
• 80-column Record
• Fixed Fields
• File
• Line Printer, LPT1

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Individual Pieces of Machinery

• Keypunch Machine
• Card Sorter
• Card Reader
• Computer
• Printer or Keypunch output

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Other Terms to Know

• Paper Tape
• Buffers
• Registers

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Programming

• Wires hardcoding
• Patch Panel
• Punch Card programs
• Program Mode or Load
• Run Mode
• Machine Language
• Assembly Language Assembler
• Third Generation Language Compiler

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More Programming

• Program Specifications
• Computer Analyst
• Coding Sheets
• Source Code
• Object Code
• Batch of cards

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1963 IBMs Model 360

• System 360
• Multiple Input/Output Terminals
• Control Console
• Operating System
• Polling
• Virtual Machine
• (not multi-tasking)

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The Main Frame

• Central Processor
• Control Unit
• Arithmetic Logic Unit
• Main Memory
• Core Memory, or Random Access Memory
• On-Line Storage vs. Off-Line Storage

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Terms to Know

• Directory
• User
• Log-In
• Time-Slice
• Swapping
• Batch Jobs vs. On-Line jobs
• The Job Queue

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Legacy Systems

• Mainframes
• IBM 3080 and 3090
• Super-Minis
• DEC VAX 9000
• HP 3000 series, HP 9000 series
• IBM AS/400
• MiniComputers
• IBM Systems/34, S/36, S/38
• Honeywell, Burroughs, NCR

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Characteristics of Legacy Hardware

• Sensitive
• Equipment
• Storage Media
• Hot
• Large Bulky
• Cards, Tapes, Disk Platters,
• Printers
• Loud
• Expensive

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The Computer Room

• Power Conditioning
• Air Conditioning
• Dry Fire Protection
• Noise Reduction
• Raised Flooring
• Controlled Access

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Other Legacy Hardware Terms

• Tape Library
• Disk Volume
• Mount and Dismount (or unmount)
• Log File
• Halon
• Development vs. Operations

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More Legacy Terms

• Computer Operator
• IPL
• Programmer vs. Analyst
• Programmer/Analyst
• Systems vs. Application
• Programmer, Software, etc.

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Characteristics of Legacy Software

• Modular Programs
• Flat File Structure
• Generally homogenous language
• Shop
• SDLC

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Introduction to Unit 4

• Systems Development Life Cycle

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Five Phases (subjective)

• Planning
• Design
• Development
• Implementation
• Maintenance

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For Next Week

• Be sure to order your PC Magazine.
• Check the WebSite
• Meet with your Groups and make sure your notes
  are complete!
• Check your understanding!