If you configured the connection correctly, you will now be able to work on your Arduino board like on a real CP/M computer. In my case the full command looks as follows:

With MacOSX it's even simpler, just start typing 'screen /dev/tty.usb' from the terminal and press TAB to unfold the device full name. VICE derives from X64, the first Commodore 64 emulator for the X Window System. Set serial transmission parameters to 8N1, speed to 9600 bauds, and select a serial port to which your CP/M machine is connected. For Windows I recommend PuTTY, in Linux you can install minicom package. Ok, the system has started, but how do you talk to it? Well, you need a terminal, just like for a real CP/M machine! Depending on your operating system, you will need a terminal software. You now have the smallest CP/M computer in the world up and running. Now turn off the Arduino, put the card into the SD card shield, and connect it back. GitHub - TomHarte/CP-M-for-OS-X: A z80 emulator + CP/M-80 reimplementation that intends to allow original CP/M software to be used under OS X. You can create folders from A up to P (as this is the limit of CP/M itself). A z80 emulator + CP/M-80 reimplementation that intends to allow original CP/M software to be used under OS X. Also create folders 'A' and 'B' - these will be your disk drives, everything you put in there will appear to the system as located on disks 'A:' and 'B:' respectively. To run it, format an SD card as FAT32, and put the CPM22.BIN from RunCPM repository in the main folder of the card. Best Mac emulators guide: Emulate Mac OS 9 with SheepShaver Should you want to delve into the Apple period between the Macintosh Plus and OS X, SheepShaver will emulate Mac OS 7.5.2 through 9.0.4. RunCPM comes with the most popular version 2.2 of CP/M. Now, when you have a fully fledged Z80 board, all you need is the CP/M operating system.

Open RunCPM.ino project, select 'Verify/Compile' under the Sketch menu to produce the binary image, and then select 'Upload' to flash the board with it. Next, connect the board to your computer with a micro USB cable inserted into the programming port of Arduino, and then select 'Arduino Due (Programming Port)' for the Board and the Port (remember: Arduino must be connected to the computer).

I managed to build RunCPM without problems on Ubuntu 12.04 using version 1.6.7 for Linux 64bits, just remember to install support for Arduino Due with Boards Manager under Tools menu. Now you need to download Marcelo Dantas' RunCPM, which is a multiplatform CP/M emulator, and upload it to the board with Arduino IDE.

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