High Quality Content by WIKIPEDIA articles! Teller assist units (TAU), also known as automatic teller safes (ATS) or teller cash dispensers (TCD), are devices used in retail banking for the disbursement of money at a Bank teller wicket or a centralized area. Other areas of application of TAU include the automation of starting and reconciling teller or cashier drawers (tills) in retail, check cashing, payday loan / advance, grocery, and casino operations.