Would you really want to code on this tiny screen though? I guess some people would, but you'd probably be a lot more comfortable even on a 12" or 10" laptop/netbook.
Oh ofc this is not "practical", but projects like these are always fun to see, how much something can be scaled down, that it can be in some cases be viable (think washing machines) to be a full linux-powered computer.
A forth env fits in 64x16. Nethack has a patch somewhere for low resolutions, from the zipit z2, based on the 3.4.3 release. If it works on Nethack, Slashem
should be easily patchable, too.