Tax programming for Sharp ER-A520 Cash Register can still be done however I'm sure you aware that Sharp cash registers are no longer made. We do offer support for the commercial grade Sharp cash registers. Our support is available for a fee. If you are looking for a good replacement for a sharp cash register try the SAM4s models. SAM4s is the only commercial grade cash register on the market.
For support via phone for a fee call us at 800-863-2274 and remember support is offered for a fee, please do not call to ask for free programming help.