Abstract: A structural unit comprises a rectangular base and floor with vertical walls attached to form an enclosure, and with a roof assembled thereto to form a miniature building, for containing a banking transactional computer, designated an automatic teller machine (ATM), which allows customers to withdraw currency and make deposits. The enclosure is designed for installation on narrow drive-through traffic islands and pedestrian walkways and may be used in shopping malls and retail outlets. The enclosure has interior space for private and secure servicing and maintenance of the ATM by bank and computer maintenance personnel. Through the use of an indexing turntable mechanism the ATM may be moved and rotated within the enclosure in order to present the operating portions and electronics of the machine for access required by the bank and computer personnel, without exposing them to conditions which encourage interference by outside agents or bystanders.