This seems to be a clone(?) of Patrick Davidson's [1] Phoenix for TI calculators [2,3].

[1]: http://www.ocf.berkeley.edu/~pad/main.html

[2]: http://www.ticalc.org/archives/files/fileinfo/148/14876.html

[3]: http://www.ocf.berkeley.edu/~pad/frames-ti83p.html