The second operating system I used (after TrsDos) was CPM on a Z80 development machine. Some time ago I build the Z80 MBC2 board and I played with CPM again. I included a fully working MBC2 emulation in my Z80 IDE program but after using DosBox I got the idea of creating CpmBox. CpmBox is a full CPM 2.2 implementation on a Z80 emulator for Windows, including a VT100 terminal and 8 CPM disks based on the MBC2 with the looks of a real terminal. It is a portable windows program (one single executable) and the zip file contains the emulator, a directory with a lot of disks and the bootdisk and a dos based directory to load CPM files from and to dos. It is also possible to save and load programs from dos and save or load them to a CPM disk. This emulator is exactly like a Z80 MBC2 computer running CPM 2.2 (without the i/o chip) and connected to a VT100 terminal.
- Emulates: Z80 and VT100 terminal;
- OS: CPM 2.2;
- Keyboard: full 53 keys emulated by the PC keyboard;
- CPU: Zilog Z80 the speed is depending on the PC hardware;
- RAM: 64 kb;
- Textmode: 24 x 80 characters;
- Graphics: None;
- Color: White on green screen;
- Sound: None;
- I/O: 15 CMM disks and access to DOS disk;
- Design: Like an old terminal screen.
https://www.heinpragt-software.com/software_development/cpmbox.html
