History of computing in Poland
The history of Polish computing (informatics) began during the Second World War with breaking the Enigma machine code by Polish mathematicians. After World War II, work on Polish computers began. Poles made a significant contribution to both the theory and technique of world computing. In the State Institute of Mathematics, established in 1948 (from 1952 at the Polish Academy of Sciences), it was decided to start prospective work on the construction of at least one machine comparable to the American ENIAC. For this purpose, the Mathematical Apparatus Group of this Institute ("pol. Grupa Aparatów Matematycznych , GAM") was established. The first engineering employee of GAM was Leon Łukaszewicz, and shortly after he was joined by his fellow students, Romuald Marczyński and Krystyn Bochenek. Logician and statistician Henryk Greniewski became the head of GAM. There were no resources to build such a computer - neither technical facilities, nor electronic equipment, nor experience. The only chance was given by the enthusiasm and alleged talent of a few newly promoted engineers. Polish computer hardware designs in 1958-1986. Odra. Some of the earliest computers created in Poland were the first Odra computers. They were manufactured at the Elwro manufacturing plant  in Wrocław, (the brand name comes from the Odra River that flows through the city of Wrocław) and exported to other communist countries. The production started in 1959–1960. The last series of Odra computers—the Odra 1300—consisted of three models: the Odra 1304, 1305, and the 1325. Although the hardware was developed by Polish teams, the software for the above machines was provided by the British company ICL. The Odra was ICL 1900 compatible. K-202. K-202 was 16-bit minicomputer built by Jacek Karpiński in 1971. It was faster and cheaper than most of the world's production at  this time, and more advanced than IBM PC released decade later, but the production was never started because of political reasons and dependence on western parts; it was not compatible with the ES EVM standard. Meritum. Produced by Mera-Elzab, Meritum I and II models were created in 1983 and 1985 respectively. Based on U880DA CPU (Zilog Z80 clone), with 16 and 48KB RAM, were based on the TRS-80 computer. They were intended primarily for scientific, engineering and office applications. Elwro Junior. Elwro 800 Junior (1986) and Elwro 804 Junior PC (1990) were ZX Spectrum clones intended for schools , and for home use respectively. The 804 model had a 3.5" disk drive built in; the drive was available as an accessory for 800 (the alternative mass storage being a tape recorder). The computers used the Z80A CPU, 64KB RAM and 24KB ROM. The ROM contained either CP/J (a variant of CP/M) operating system, or Spectrum-compatible BASIC. Mazovia. Mazovia was a Polish clone of IBM PC/XT. Polish Information Processing Society. The "Polish Information Processing Society" (also known as "Polish Informatics Society") is the oldest Polish organization that associates professionals from the computing industry. They  act for their environment, as well as the social and economic environment. As part of its statutory activities, the Polish Informatics Society speaks on behalf of the surrounding community in the most important issues related to computerization, is consulted in legislative processes, and conducts certification and appraisal activities. They also organize a series of conferences, meetings and thematic workshops aimed at improving competences and integrating IT specialists. They are also working to increase general digital skills in society. They effectively promote Poland by showing the global successes of their computer scientists and unique digital technology products created in Poland. History