RunCPM is an application which can execute vintage CP/M 8 bits programs on many modern platforms, like Windows, Mac OS X, Linux, FreeBSD, Arduino DUE and variants, like the Teensy or ESP32. It can be built both on 32 and 64 bits host environments and should be easily portable to other platforms. RunCPM is fully written in C and in a modular way, so porting to other platforms should be only a matter of writing an abstraction layer file for it. No modification to the main code modules should be necessary. If you miss using powerful programs like Wordstar, dBaseII, mBasic and others, then RunCPM is for you. RunCPM emulates CP/M 2.2 from Digital Research as close as possible, the only difference being that it uses regular folders on the host instead of disk images. RunCPM builds on Visual Studio 2013 or later. We’ve added caching that should get around that. We now use a plain buffer per paragraph, and have seen some slow downs because of it. Adding UTF-8 support added created issues with the single buffer issue. It can be built also on Cygwin (posix) and Mingw. Every version of WordTsar has been using a gapbuffer for it’s underlying document buffer. Makefiles are provided with the distribution. RunCPM was written to serve as a test environment when I was restoring the only copy of Z80 MicroMumps v4.06 which exists online ( ). Making changes, recompiling MicroMumps and loading it onto a regular CP/M emulator via a disk image every time I moved a bit forward on the restoration was becoming too time consuming. So I decided to write something that would allow me to run the executable right away after making any modifications. RunCPM then evolved as more and more CP/M applications were added to its compatibility list. RunCPM builds on Arduino IDE 1.8.7 or later.

RunCPM so far runs on the Arduino DUE, on the Teensy 3.5 and up, on the ESP32 and on some STM32, as it requires a fair amount of RAM to run (64K used to be a lot back in those days). Settings are also unified so configuration is done once and for all. It enables you to run classic games on a wide range of computers and consoles through its slick graphical interface. If using the Arduino DUE, RunCPM also needs a SD (or microSD) card shield to place the CP/M files in. RetroArch is a frontend for emulators, game engines and media players. The Teensy has an on-board microSD adapter.

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