Installing DOS 6.20 [PC-98]

First of all, if you attach an unformatted disk to either a PC98 emulator or a real PC9801 machine and attempt to boot from it, you'll see the following screen advising that the hard disk is currently unformatted:

Step 1. Boot from disk 1 of the DOS 6.20 disk set, you're asked to choose the destination for the install; either a hard drive (first option), or a floppy (second option):

At this point you can exit to a command prompt if you don't want to install by pressing Escape and then confirming that you don't want to install (first option), or back to the installer (second option).