I have purchased a ti-83+ and I installed mirage os and a few games, and mirage os always gets a glitchy screen when i go into it, and it can go to normal after a few movements but it screws up again later. Nearly any game I play the lcd is so glitched it is nearly unplayable, it either shakes, or the screen is divided strangely, or it just gets bad.
I took that calculator back, and I got a new one and it has the exact same problem. A friend of mine who purchased a calculator has the exact same problem as well. I have tried using crunchyos and that still presents the problem. I updated the os, nothing. Clearing memory, anything, nothing seems to work properly.
The calculator portion works fine, however.