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Reference.org
ATM controller
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<p>An ATM controller (ATMC) is a system used in financial institutions to route financial transactions between <a href="/facts/Automated_teller_machine/8y5eVFUr">ATMs</a>, <a href="/facts/Core_banking/FcXPPu8I">core banking systems</a> and other banks. An ATMC is sometimes referred to as an "EFTPOS Switch". An ATM controller is key infrastructure in an <a href="/facts/Interbank_network/y2mVNWdY">interbank network</a>. </p>