For a POS system input is probably all numbers- look up customer by phone, make choices from a menu, enter quantities. Letters are for new customers and specia

For a POS system input is probably all numbers- look up customer by phone, make choices from a menu, enter quantities. Letters are for new customers and special instructions. I worked at a print shop that switched from DOS to Windows for it's POS software, it was an order of magnitude slower. At least we could play solitaire though.