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Microsoft DOS 4.00
bootOS is a monolithic operating system in 512 bytes of x86 machine code. The docs aren't guaranteed to be up-to-date
examples of some bios interruption functions
Matrix rain code in 256 bytes
Toy 16-bit real mode operating system
Summator of two hexadecimal values in boot
CRC32 Algorithm For Intel 8086 Platform (Realmode)
experimental 32bit protected mode application
An OS made entirely in real mode cuz interrupts in protected mode is bad