Ten years ago I worked at a place that used single board DOS machines for clocking in and out. And this wasn't just at the beginning and end of a shift, this was every time they worked on a new batch of parts. It became very hard to keep these machines operating, you couldn't get spare parts for them anymore without scrounging other machines.

It was a medical device manufacturer, so it wasn't just company inertia holding them back - any change had to go through regulatory compliance. The company was in the midst of replacing their planning and tracking system when I left, and they've changed ownership twice, so I presume they've managed to replace those old systems too. I shudder to think of the problems they're having if they haven't.