Savoj, я на всяк случай скопирую сюда инструкцию, по инсталлу ibm pc-dos 2.1

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1. Low-level format the hard disk. Ensure the hard disk is physically in the orientation that it will be used, i.e. not on its side if it will be used flat.
2. Reboot and run FDISK and create a partition and make it active.
3. Reboot and run 'format c: /s', which will perform the high-level format and transfer the two hidden system files.
4. Copy a:\command.com c:
5. Create a DOS directory on C: (i.e. c:\dos) then copy the contents of the floppy disk(s) to it
6. Create a file c:\config.sys using 'copy con c:\config.sys' then type:
FILES=30
BUFFERS=30
(then press F6 then enter to save)
7. Create a file c:\autoexec.bat using 'copy con c:\autoexec.bat' then type:
ECHO OFF
PATH C:\DOS
VER
(again press F6 then enter to save)

Now remove the floppy from the drive, and reboot to DOS 2.1 from hard disk