In 1981, the IBM PC was released by IBM, which was its first computer. Its code-name was Acorn, and it used MS-DOS. It included features such as 16 KB of memory (Expandable to 256 KB), an 8088 processor.
Later, in March 1983, the first PC clone, Compaq Portable was introduced. A sit was developed by IBM; so, it was able to run any software developed for IBM computers and fully compatible with IBM computers.