<Tr> <Th> Predecessor </Th> <Td> IBM Personal Computer </Td> </Tr> <Tr> <Th> Successor </Th> <Td> IBM Personal Computer / AT </Td> </Tr> <P> The IBM Personal Computer XT, often shortened to the IBM XT, PC XT, or simply XT, is a version of the IBM PC with a built - in hard drive . It was released as IBM Machine Type number 5160 on March 8, 1983 . Apart from the hard drive, it was essentially the same as the original PC, with only minor improvements . The XT was mainly intended as an enhanced IBM PC for business users . Later floppy - only models would effectively replace the original model 5150 PC . A corresponding 3270 PC featuring 3270 terminal emulation was released later in October 1983 . XT stands for eXtended Technology . </P> <Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (August 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table>

When was the ibm xt microcomputer released in the market