An operating system hosted on SourceForge, whose "drivers" directory includes support for a grand total of two devices -- the IBM PC floppy and the PC/AT clock [1]. DOS thinks different!
(Of course counting drivers in DOS is highly misleading, as the BIOS [2] directly offers all the useful calls like "turn on cassette drive motor" and "read joystick" that you will need to build modern microcomputer software.)
[1] https://sourceforge.net/p/freedos/svn/HEAD/tree/kernel/trunk...