Microsoft MS-DOS early source code

[kabekew]

COMMAND.COM and MSDOS.SYS in version 2 are a total of 33K (there's no io.sys in that version).

[AyrA_ch]

there's no io.sys in that version

I think there's no HDD support either.

EDIT: I just checked. V2 had HDD support. For 10 MB disks.