The Burroughs B5500 was an innovative, third-generation architecture employing parallelism and multiple I/O processors, allowing many operations to occur simultaneously. For the first time in a commercial machine, it introduced everal key concepts in computer architecture such as virtual memory, stack-based addressing, and multiprogramming. It ran such programming languages as Algol and COBOL and was popular in fininacial institutions such as banks. This is the maintenance panel from a Burroughs B5500 mainframe computer system. Sticker with text: "ASSY NO 11061686-002."