First things first: why doesn't your pal sign up here and post his question himself? ;)

Secondly, Escape from the planet of the robot monsters does work with 2mb memory, so we'll correct that in the page, thanks for bringing that up to our attention :). Like you, all of our machines have 4MB of RAM and above, so we can't test them in anything else except STEEM. The best thing you can do is try running the game in STEEM with 1 or 2mb and see if it works ;). If it does, we'd be more than happy to change our info page.

As for your question: generally the patched games roughly as much memory the game's file size plus 0.5mb (or 1mb in some cases) extra. The data is in memory packed and is unpacked when needed.

P.S. I did a whoopsie with Badlands :(, it should be possible to work with 1mb ram! I'll try to fix that when I get back home.