The IBM PC or IBM Personal Computer was a personal desktop computer released by IBM in 1981 and discontinued in 1987. The IBM PC, model 5150, ran on PC-DOS 1.0. It was equipped with a Intel 8088 @ 4.77 MHz CPU and a 16 kB ~ 256 kB RAM. The IBM PC succeeded the IBM Datamaster and was followed by the IBM Personal Computer XT, IBM PCjr, IBM Portable Personal Computer, IBM Personal Computer/AT and IBM PC Convertible. It was designed by IBM Entry Systems Division in Boca Raton, Florida.