CP/M was essentially THE compatibility standard for business software before DOS. If you wanted to run a professional text editor or database before the PC and

CP/M was essentially THE compatibility standard for business software before DOS. If you wanted to run a professional text editor or database before the PC and MS-DOS era, it pretty much had to be CP/M. UNIX was of course much more powerful, but didn't run on cheap 8-bit computers. And some home computers also offered CP/M compatibility as an add-on (for instance here: the Amstrad CPC booting into CP/M: https://floooh.github.io/tiny8bit/cpc.html?file=cpc/6128sp_4.dsk&input=%7Ccpm%0A https://floooh.github.io/tiny8bit/cpc.html?file=cpc/6128sp_4...) And the whole reason why Commodore added a second CPU to the Commodore 128 was CP/M compatibility, that's how powerful the "lure of CP/M" was at the time.