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The '''[[wikipedia:IBM Personal Computer XT|IBM Personal Computer XT 5160]]'''is the original name of the PC architecture. The first model, often shortened to the '''IBM XT''', '''PC/XT''', or simply '''XT5150''', was a version of the IBM PC with a built-released in hard drive1981. It was released on March 8, 1983. Apart from Over the Winchester diskcourse of thirty years, it was essentially the same as the original PC, with only minor improvements. The XT was mainly intended as an enhanced and "IBM PC for business users. Later floppy-only models would effectively replace compatibles" began to dominate the original model 5150 PC. A corresponding 3270 PC featuring 3270 terminal emulations was released later in October 1983. Later, the PC/AT 5170 was released with many enhancementsenterprise and consumer world thanks to IBM's move to use an open architecture, the most major of which was probably the 286 processor. This allowed a 16-bit bus, which is why 16ton of add-bit ISA cards will only work on AT or newer, though some XT-class machines have the older 8086 processor, which also allows for a 16-bit bus, ons and therefore 16-bit ISA cardsperipherals to form markets of their own.

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