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A tweet shares a free book called 539kernel that teaches building an entire operating system from the x86 boot sector at address 0x7C00, progressing from the first instruction to a working kernel.
A bare-metal x86 tool for dumping system RAM to a boot medium via cold boot attacks, useful for security research and experiments.
A developer documents their journey of writing a custom x86 BIOS from scratch to boot DOS on a Behringer DDX3216 mixing console, which uses an AMD Elan SC300 386 SoC.