Harman Patil (Editor)

CER 203

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CER-203

CER (Serbian: Цифарски Електронски Рачунар – Digital Electronic Computer) model 203 was an early digital computer developed by Mihajlo Pupin Institute (Serbia) in 1971. It was designed to process data of medium-sized businesses:

  • In banks, for managing and processing of accounts, bookkeeping, foreign-currency and interest calculations, amortization plans and statistics
  • In manufacturing, for production planning and management, market data processing and forecasting, inventory management, financial document management and process modelling
  • In utilities, to calculate water and electricity consumption, to produce various reportsand lists and for technical calculations and design
  • In construction industry for network planning method design, financial management and bookkeeping
  • In trading companies for payment processing, market analysis, inventory management and customer and partner relationship management

    • Specifications

    Central Processing:

  • Type: BMS-203
  • Number of instructions: 32
  • Performance:
  • one 16-cycle instruction: 20 μs
  • one single cycle instruction: 5 μs
  • addition and/or subtraction of two 15-digit numbers: 20 μs

    • Primary memory:

  • Capacity: 8 kilowords
  • Speed (cycle time): 1 μs
  • Complete, autonomous memory error checking
  • Parity control

    • Punched tape reader:

  • Dielectric-based reading
  • Speed: 500 to 1,000 characters per second
  • Accepts 5, 7 and 8-channel tapes

    • 'Tape puncher:

  • Speed: 75 characters per second

    • Parallel Line Printer 667:

  • "On the fly" printing
  • 128 characters per line
  • Removable/replaceable printing cylinder
  • Speed:
  • 500 lines per minute for a character set of 63 characters
  • 550 lines per minute for a character set of 50 characters
  • Automatic paper feeder
  • Two line spacing settings
  • Programamtic tape for discontinuous paper movement
  • Maximum number of carbon copies: 6

    • Independent Printer M 30:

  • 132 characters per line
  • Speed:
  • Prints 25 alphanumeric characters per second
  • Prints 33 numeric characters per second
  • Tabulation speed: 144 characters per second
  • Blank printing speed: 100 characters per second
  • Maximum number of carbon copies: 6

    • Magnetic cassettes 4096:

  • Capacity: 600,000 characters
  • Variable record length
  • Transfer rate: 857 characters per second
  • Tape speed: 10 inches per second

    • Magnetic Tape Drives:

  • Data format: 9-track ASCII with inter-record space of 0.6 inches (1.524 cm)
  • Data density: 556/800 bits per inch
  • Capacity per tape: c. 10,000,000 characters
  • Tape speed: 24 inches/s, 150 inches/s fast-forward and rewind
  • Transfer rate: 19.2 kHz
  • Tape width: 1/2 inch (1.27 cm)
  • Tape length: 2400 ft (731.52 m)
  • Working ambient temperature range: 5 °C to 40 °C
  • Relative humidity: up to 80%
  • Integrated circuit control logic
  • Separate control panel for each drive
  • Read/Write Capabilities:
  • Read and Write forward
  • Read forward
  • Read reverse

    • References

    CER-203 Wikipedia
    (Text) CC BY-SA