Seriously? Well, okay, some things you could try would include:
- use a fixed-pitch font for all controls, perhaps even an ancient (raster?) font like
System
- set all forms to have a black background with white (or green, or even amber) text
- get rid of as many graphical elements as possible (borders, shading effects, buttons that actually look like buttons, etc.)
- size your forms so that you will get approximately 80 columns by 25 lines of text (or perhaps slightly larger if you want to go for a "Super VGA" look).
- and so on.... (you get the idea).
Good luck with this. It certainly qualifies as the strangest request I've seen here so far.