OK... Wel I'm doing some work in good old DOS 6.22 today.... Speaking as someone who has seen the boxes in the Microsoft Museum this is a painfull experience.
In order to play with DOS I had to fina
a) A Floppy disk drive...
b) A DOS bootable disk image
c) A floppy disk
A/C weren't too easy a task- I had a USB floppy at home and some stoopid supplier of our continues to use floppies for drivers.
I found a GREAT site for boot disks though- you just download the EXE and it writes you a boot disk.