I think some of Jens' versions of Scratch support lower resolution screens. CHIRP comes to mind...let me look around
Well...the good news is that it looks like CHIRP does support low res screens. The bad news is that CHIRP only works on top of Scratch 1.2.1 which I'm not sure where to find anymore and won't have the fancy 1.3 features. Here is the website where you can read about it.
http://chirp.scratchr.org
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