This program is able to rotate and resize a model, and also change its vertex count.
It isn't the fastest - neither is it smooth, but that's kind of a restriction on the calculator's hardware.
Only assembly would make ik quicker, although I'm not experienced in that language.
A port can be made to TI-84+ calculators - the only reason it isn't for the non-color calculators is the drawing coordinates;
TI-84+C calculators have a resolution almost 3 times bigger than the regular TI-84's.
With enough notice I'll create such a version.
[ENTER]: Quit program
[(] or [)]: Change vertexcount. This is for the top and bottom face only.
[Arrow keys]: Rotate model.
[-] or [+]: Change model size.