In brief
µOS was written in Borland Pascal, using the bundled assembler; its graphical interface libraries were built entirely from scratch rather than on an existing framework.
It ran on a 16-bit 386/486 with a VGA card, a standard Microsoft-compatible mouse, at least 3 MB of free disk space, and as little as 256–550 KB of RAM — installed from a single 3.5" floppy disk, 1.44 MB.
The system used plug&play, automatically detecting connected hardware — unusual for DOS-era software, which typically required manual editing of CONFIG.SYS.
A handful of small helper applications shipped alongside the shell: an icon editor, a spreadsheet, two database tools, and a floppy formatter. Due to the licensing realities of the time, the fonts and icons used throughout the system were designed in-house rather than borrowed from third-party sources.
Full page in Polish, with screenshots and the complete requirements table →