of the Replica 1, Briels introduced a version known as the TEN which has a limited run of 50 boards notable for using a red colored board. For most practical purposes these were the same as the Replica 1 plus that was to follow a year later. Replica 1 plus The most recent model of the Replica 1 is the Replica 1 Plus, now sold by ReActivemicro. The Second Edition model integrated both the previous Serial I/O board plus a new USB interface into the main board. Other improvements included a wall mounted DC power supply replacing the previous model's reliance on a full PC power supply and a power on light indicator. The Third Edition model removed the USB interface and replaced the AVR microcontroller used to generate video with a Parallax Propeller chip. Briel's announcement for the Replica 1 Plus version in May 2014 claimed it allowed for a direct connection to the USB port on a computer for power and programming, and it had two firmware ROMs allowing selection of either Apple 1 Basic or Woz monitor and Applesoft lite. On 1 March 2018 ReActiveMicro announced they had formed a partnership with Briel and henceforth would be selling and supporting Replica 1 plus. Assembling Replica 1 Some care is required in assembling Replica 1 in particular proficient soldering technique is required. At KansasFest in July 2009 Briel held a workshop to help new Replica 1 owners construct their machine, Computerworld magazine editor Ken Gange documenting errors he made in process of completing a working machine. Interfacing capability The original and Second Edition (SE) versions of the Replica 1 did not contain an Apple 1 compatible expansion connector (slot), but instead there was available an expansion board that could be connected and that did contain additional expansion slots. The Third Edition (TE) and later models do contain an Apple 1 compatible slot which can either be used to connect an additional Apple 1 compatible add-on board or to connect to the expansion board so additional original Appled or third party expansion boards can be attached. Expansion boards included the CFFA1 Card Reader and Multi I/O Board by Briel Computers. Other connectors include (model dependent): RS-232 Serial port: for interfacing with a home computer running a terminal emulation program, such as HyperTerminal for Windows, or ZTerm for OS X. This allows for quick data inputting for large programs, which