Abdijobborov, a student of group 711-21, prepared a slide on the English language subject "the university I study at" by Gayratjon



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One major limitation was the inability to install a hard drive, as described above. Another was that there were only five expansion slots, which tended to get filled up by essential hardware - a PC with a graphics card, memory expansion, parallel card and serial card was left with only one open slot, for instance.

IBM rectified these problems in the later XT, which included more slots and support for an internal hard drive, but at the same time released the 5161 Expansion Unit, which could be used with either the XT or the original PC. The 5161 connected to the PC system unit using a cable and a card plugged into an expansion slot, and provided a second system chassis with more expansion slots and a hard drive.

These machines became known as IBM compatibles or "clones", and software was widely marketed as compatible with "IBM PC or 100% compatible". Shortly thereafter, clone manufacturers began to make improvements and extensions to the hardware, such as by using faster processors like the NEC V20, which executed the same software as the 8088 at a higher speed up to 10 MHz.

The clone market eventually became so large that it lost its associations with the original PC and became a set of de facto standards established by various hardware manufacturers.

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