CER (Serbian: Цифарски Електронски Рачунар - "Digital Electronic Computer") model 12 was an third generation digital computer developed by
Mihajlo Pupin Institute( Serbia) in 1971and intended for "business and statistical data processing". However, manufacturer also stated, at the time, that having in mind its architecture and performance, it can also be used successfully in solving "wide array of scientific and technical issues". CER-12 consisted of multiple modules connected via wire wrapand connectors.
Arithmetic unit contains:
* two separate groups of eight 2-
byte index registers
* single-byte adder supporting both binary and BCD addition (same unit is used for
subtraction, multiplicationand division had to be implemented in software)
Control unitcontains a program counterand instruction registers. It fetches instructions and facilitates program flow. It supports single-operand instruction set and works with all 16 index registers of the arithmetic unit.
Interruptsystem of CER-12 consists of a number of dedicated registers and software. It supports up to 32 interrupt channels.
Control PanelControl panel of CER-12 allowed the operator to control and alter program flow and/or to eliminate errors detected detected by error-detection circuitry. It features a number of indicators and switches.
Operating system and other software
Following software was shipped with CER-12:
* "Symbolic programming language" and assembler (called "autocoder")
* A number of test programs
COBOLand FORTRAN IV compilers
Linear programmingand PERTplanning software
* A library of applications and subroutines
* 5-8 track, 500 characters per
second punched tapereader PE 1001
* 5-8 track, 150 characters per
secondtape puncher PE 1501
CDC 9432magnetic disk drive as secondary storage(4,096,000 characters per 6-disk, 10-surface volume organized into 100 cylinders with sixteen 1536- bit(48 processor words) sectors; track-to-track seek: 30 ms; rotational latecy: 25 ms)
IBM 1735 teleprinter
ICL 667 line printer(725 lines per minutefor 64-character set or 880 lines per minute for 50-character set)
Mihajlo Pupin Institute
History of computer hardware in the SFRY
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