When I worked at Burger King a few years back, they used something very similar for stock control and daily takings.
I don't have any problem with them using ms-dos because maybe its a good system, and there is no need to change it. But the pic with the floppy disks...
Where do they buy floppies? drives? motherboards for those drives?
There's a site selling floppy disks/drives, and their "gold standard" is the modular Dell laptop floppy drive (which has USB, and is recent). And disks aren't in short supply.