Arguably, Exxon's plan to build a computing ecosystem rival to IBM's would have worked too, if the 16 bit successor of the Z80 would have maintained upward binary compatibility with Z80.
CP/M was an absolute beast in the era, with massive installed base and software support, employing 500 people in 1982. A CPU that could run unmodified Z80 software in a 64k segment would have allowed DRI to ship 16 bit CP/M with only basic tweaks and likely kill the market for the PC.
It was, famously, DRI dragging their feet on 8086 support that motivated the release of QDOS, which was then bought by Microsoft and relicensed at an immense markup to IBM as MS-DOS.
Arguably, Exxon's plan to build a computing ecosystem rival to IBM's would have worked too, if the 16 bit successor of the Z80 would have maintained upward binary compatibility with Z80.
CP/M was an absolute beast in the era, with massive installed base and software support, employing 500 people in 1982. A CPU that could run unmodified Z80 software in a 64k segment would have allowed DRI to ship 16 bit CP/M with only basic tweaks and likely kill the market for the PC.
It was, famously, DRI dragging their feet on 8086 support that motivated the release of QDOS, which was then bought by Microsoft and relicensed at an immense markup to IBM as MS-DOS.