There were lots of computers in the '80s which claimed official MS-DOS compatibility through emulation or added hardware. There were the Solution and Conqueror

There were lots of computers in the '80s which claimed official MS-DOS compatibility through emulation or added hardware. There were the Solution and Conqueror emulators for the Sinclair QL, there was Amiga Transformer from Commodore for the Amiga, there were ST Outlook and pc-ditto for the Atari ST. Not long afterwards, hardware made MS-DOS compatibility much better because the speed of MS-DOS could easily be as fast as or faster than real IBM hardware. There were many options including the Sidecar, BridgeBoards, KCS PowerPC, and more on Amigas. Later, there were DOS compatibility cards for Macs. Often these options had advantages over having a separate DOS compatible computer, like the ability to still run the native system at the same time, and often to share files / drives and other resources. It was an interesting time, for sure.