You might ask yourself how people create lowercase letters on the TI-83+ or TI-84+. You can do this on the computer and then send the program to your calculator, or you can do this:
Create a new program, and call it anything you want:
Program:LOW AsmPrgm 2114 8A3E 08AE 77 C9
You can get AsmPrgm from the catalog.
When you have typed this, you can quit the program. Then: run the program in assembly. Type on the home screen:
When you have executed the program, you can now enter the lowercase letters by pressing the ALPHA button twice.
Keep prgmLOW on your calculator. For some strange reason you sometimes have to execute this program again.