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When a credit card is processed , it contacts the network to verify if the credit card can be authorized. The transaction is then stored on the machine until the polling window is opened. The machine will either upload the electronic funds directly to the merchant bank, or a polling service provider will dial in to collect, process then submit the data to the merchant bank. The most popular credit card terminals consist of a modem, keypad, printer, magnetic stripe reader, power supply and memory card. They have had the same basic design since the 1980s. As with computers, there is a wide range of memory capacities and other features like built-in printers and debit card pinpads that affect the manufacturing cost of a credit card terminal.