CER-12

CER ( – "Digital Electronic Computer") model 12 was a third-generation digital computer developed by Mihajlo Pupin Institute (Serbia) in 1971 and intended for "business and statistical data processing" (see ref. Lit. #1 and #4). However, the 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" (ref. Lit.#2 and #3). Computer CER-12 consisted of multiple modules connected via wire wrap and connectors.
Central Unit.
Primary memory
Arithmetic unit contains:
Control Unit
Control unit contains a program counter and 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.
Interrupt System
Interrupt system of CER-12 consists of a number of dedicated registers and software. It supports up to 32 interrupt channels.
Control Panel
Control panel of CER-12 allowed the operator to control and alter program flow and/or to eliminate errors 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: