Definitions for "IBM-compatible"
A computer is that provides the same functionality as an IBM PC, but is made by another company. It is capable of running any software that an IBM PC can run.
A computer based on Intel microprocessors that uses the MS-DOS operating system. The first popular Intel/DOS machine was the IBM Personal Computer (Intel 8088 processor).
PC — A computer that uses an Intel (or compatible) processor and can run DOS and Windows.