One famous example is Jacek Karpiński [0]. Soviet pressure, opposition to the use of Western parts, and intense jealousy of the commie state bureaucracy which sought to hold a monopoly over computer production (e.g., through the state-owned companies Odra and Elwro) halted production.
Here's some English language documentation for one of his models (the K-202) which was exported to the UK [1]. (The state-produced Mera 400, a heavily modified version of the K-202, did achieve a great deal of success, however, despite high production costs.)
There was an article posted here about him about 10 years ago [2].
[0] https://en.wikipedia.org/wiki/Jacek_Karpi%C5%84ski
[1] https://web.archive.org/web/20241012182627/https://www.zenke...