The IBM 360 mainframe made its debut in April 1964. With the unprecedented ability to perform 229,000 calculations per second, it became the enterprise platform for transaction-heavy, critical applications. With the emergence in the mid-1980s of mid-range systems (such as SUN’s RISC processor) as well as PCs networked with servers, many thought the mainframe would go the way of the dinosaur. However, in the early 1990s IBM introduced the System/390 family with a groundbreaking computing capacity of 1,000 MIPS (million instructions per second). Since then mainframe computing capacity has increased by more than 30% year-over-year.