The Iowa Lottery is installing new electronic ticket machines this weekend. Iowa Lottery spokeswoman Mary Neubauer says they’ll shut down the 27-hundred lottery terminals Saturday to install the new machines.The switchover will begin at 9 p-m Saturday. The new machines are red, replacing the green machines that have been around for ten years.Another change is the way the tickets are printed. The old machines used a dot-matrix printer, while the new machines are red and print tickets using heat on thermal paper. They deliver a smaller sized ticket, and are quieter and print up about four seconds faster. Nuebauer says they’ve tested the new tickets to be sure the thermal paper holds up, and they passed the test.Nuebauer says the Lottery will hold a special promotion July 16th to draw attention to the new machines and to thank players for their patience in the changeover. They’ll offer a two-for-one promotion for the three state games.The Iowa Lottery will pay 49-million dollars over the next seven years for the new terminals.