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Actually writing a basic OS that loads from a floppy isn't hard.
When a computer starts, it attempts to read the first 512 bytes of data from the Disk in the Floppy Drive (A:\) and if it does it loads it as the kernel.
So just code your kernel, I recommend Assembly for this actually, it's the smallest and fastest, then just write it to a disk with a raw disk writing program, pop it in, restart, BAM, your own basic Operating System lives.
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