Last Updated on: 3rd May 2022, 07:57 pm

Web site:
Category: Desktop, Others
Desktop environment: CLI
Architecture: x86
Based on: Independent
Media: Install CD
The last version | Released: Alpha2 | March 25, 2008

ClassiOS – an object Pascal operating system. This operating system is built entirely with the Delphi Compiler – even the boot loader. This was achieved by replacing the System.dcu and related units by a custom unit which can run in Ring 0 of the x86 CPU.

Tattam Software is redeveloping the PetrOS® IA32 (x86) OS project.


ClassiOS Alpha1 i386
md5sum: bc54fb4d1cb2618c3b93dd31df1c9b2b
ClassiOS alpha2 i386
md5sum: b47f07f5ea9a7265d6fc671c940102f9


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