CER-203

CER (Serbian: Цифарски Електронски Рачунар – Digital Electronic Computer) model 203 is 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
CER-203: CPU testing
Block diagram

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

See also

References
  • M.Momcilovic, D.Hristovic, P.Vrbavac et al.:"Domaci cifarski el.racunari CER", Zbornik Savetovanja AOP u preduzecima, pp. 38–58, Nova Varos YU, May 22, 1969. (in Serbian);
  • Miodrag Momcilovic, Miladin Dabic:"Domaci el. sistem za obradu podataka CER 203", Proc.of the VI yougoslav Symposium on AOP, Zagreb, 1972. (in Serbian).
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