Also see PS/2 connector .
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The PS/2 was IBM's second generation of personal computers . Announced in 1987 together with the initial release of the OS/2 operating system , the PS/2 series offered a number of improvements over IBM's original PC series. Most notable was a bus architecture called Micro Channel Architecture ( MCA ). The PS/2 also included a drive for 3.5-inch diskette s (older machines used 5.25-inch diskettes) and support for the VGA graphics standard.