The Z80-MBC2 is an easy to build Z80 SBC (Single Board Computer with 8MHz Z80, 128kB banked RAM, RTC, Disk on SD, Basic and Forth interpreters, CP/M 2.2 and 3.0, QP/M 2.71, cross Assembler and C toolchains). Disconnect the USB-serial adpter from the PC, and add to the Z80-MBC2 the SD module (with the microSD inside) and the RTC module (if you have it). Pay attention to install the modules exactly as shown in the photo, because they aren't 'swappable' in their positions, and permanent damages may occur if you exchange them!
Z80 Homebrew Computer
RC2014 is available in kit form for you to solder together. Through-hole components are used throughout, making soldering easy, even for those with limited soldering experience. Along with a selection of modules to extend functionality, such as serial terminals with HDMI output, digital input modules or, simple keyboard, the RC2014 is a very adaptable computer.
Through the use of standard 0.1″ headers, 5v TTL logic, and easily accessible signals means that it is very straight forward to build your own modules and extend functionality even further. Wherever there has been a chance to offer options, or to break out signals to solder pads or jumpers this has been done.
As soon as you turn RC2014 on you can start programming in Microsoft BASIC. This is very easy to get started with and some very complex programs can be written. To get right down to the metal, though, you can write your programs in Z80 machine code
Development of the RC2014 has lead to a more powerful machine with pageable ROM, 64k RAM, compact flash storage and a whole range of expansion peripherals. With the right modules, it’s now possible to run CP/M, which opens the RC2014 up to a wide range of software.
RC2014 can be bought from Tindie
Assembly guides can be found here
Module information including schematic diagrams and technical descriptions can be found here
Build A Z80 Computer Book
GitHub repository can be found here
Google Group for RC2014 owners can be found here