CER-203



CER (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 reports and 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 in
 * 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 in
 * Tape length: 2400 ft
 * 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