NCR CRAM

CRAM, or Card Random-Access Memory, model 353-1, was a data storage device invented by NCR, which first appeared on their model NCR-315mainframe computer in 1962. It was also available for NCR's third generation NCR Century series as the NCR/653-100.

The first CRAM units were deployed on NCR's 315 system. A second generation was deployed on the successor 615 or Century line of computers. CRAM was very successful in the 1960s, offering a fast and secure storage alternative to magnetic tape, but was superseded by the development of superior disk drive technology.