Make sure you do NOT use a decimal point when typing prices. If you receive a memory full error, then you have probably used all of the departments already. Try editing an existing one instead.
If you still have trouble, try to give more information on how you are using and programming the departments.
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If anyone needs a Sharp ER-A520, ER-A530 cash register manual,
Operating:
http://the-checkout-tech.com/manuals/cashregisters/Sharp_ER-A520_and_ER-A530_instruction_manual.html
Programming:
http://the-checkout-tech.com/manuals/cashregisters/Sharp_ER-A520_and_ER-A530_programming_manual.html
Registerman, September 2010