To program these, you need the alphabet layout to set the characters in the text, or you can use character codes. Both are in the manual. Look up logo programming and follow the instructions. If you get stuck, let me know.
If you need a manual, C-tech has it here:
http://the-checkout-tech.com/manuals/cashregisters/Sharp_ER-A450T_instruction_manual.html
Registerman
November 2010