![]() All the code can be found on a GitHub repository, so if you fancy a 1970s business desktop computer the size of a postage stamp, you can have a go too. ![]() If you don’t mind only 36K of RAM and one less floppy, that is. Unfortunately it doesn’t have space for the ESP’s party piece: wireless networking, but he’s working on that one too. It gives CP/M 64K of RAM, a generous collection of fifteen 250K floppy drives, and a serial port for communication. has CP/M 2.2 running in a Z80 emulator on an ESP8266. And now? Aside from those retrocomputers, how about running CP/M on an ESP8266? From multi-thousand-dollar business system to two-dollar module in four decades, that’s technological progress. In the 1970s you’d have seen CP/M on a high-end office wordprocessor, and in the 1980s some of the better-specified home computers could run it. What was once one of the premier microcomputer operating systems is now an esoteric OS, a piece of abandonware released as open source by the successor company of its developer. That’s likely these days to only produce an answer from owners of retrocomputers. Hands up if you’ve ever used a machine running CP/M.
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