KolibriOS: a full operating system in 1.44 Megabytes

KolibriOS is an open source operating system with a monolithic preemptive kernel, video drivers, for 32-bit x86 architecture computers.

The entire operating system with a good set of application fits into a 1.44 Mb Floppy Disk.

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Some interesting facts about reverse-engineering of x86 microcode, from a research by Ruhr University Bochum

Micro­code is an ab­strac­tion layer on top of the phy­si­cal com­po­n­ents of a CPU and is pre­sent in most CPUs.

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