Around 2000 we were already using normal x86 machines in the offices and homes. There was a company named Optimus which had multiple branches that back then provided: computers (assembling and selling these), software - they've become an official distributor for e.g. Activision, Ubisoft, Id Software, Disney etc., translations for foreign software, and they also become one of two offical Nintendo distributors in Poland. Optimus had chances to become a really good player here but due to financial management "problems" they have failed - to put this short. In 2009 Optimus merged with what nowadays is known as CD Projekt. Optimus' other child - a web portal known originally Optimus Net has become onet.pl and it survived till today but become a part of Ringier Axel Springer Poland.
There were specific places which used our "native" machines for years. For example last Odra computer was shut down on April 30th in 2010 after 34 years of continuos work at Polish Railways computer centre.
Beside the technology museum you mentioned there is (or was - not sure what happen) an Apple museum in Warszawa - folks hoarded over 1700 items under their care.
https://applemuzeumpolska.webflow.io/en/home
Country itself changed in last 20 years and if you haven't seen it again in that time, you should return