PC Poll for the Sharp ER-A530 is still available however the cash register is not. If you still have the ER-A530 and you would like to connect it to a computer we can help you however we would urge you to upgrade the register instead.
The best replacement for the Sharp ER-A530 is probably the SAM4s SPS-340 because is has a nice large flat keyboard, receipt and journal printers and five bill five coin cash drawer insert. Give us a call at 1-800-863-2274 and we would be happy to consult with you about selecting the right model.