The PicoBSD reference article from the English Wikipedia on 24-Apr-2004
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PicoBSD

Helping orphans the way you would do it
PicoBSD is a one floppy disk version of the BSD operating system descendant FreeBSD, which in its different variations allows you to have secure dialup access, small diskless router or even a dial-in server. And all this on only one standard 1.44MB floppy. It runs on a minimum 386SX CPU with 8MB of RAM (no hard disk required).

With flexibility that FreeBSD gives, and full source code available, one can build a small installation performing various tasks, including (but not limited to):

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