kit as well as pre-assembled. Power was provided via a 12 pin connector compatible with a PC/XT power supply. Input could be from an ascii-style keyboard as used in Apple, the more commonly available standard PC keyboard connected via ps/2-style connector, or a terminal or terminal emulator connected via the optional add-on piggy-back serial card. AVR microcontrollers were used both for the video control circuitry and keyboard interface. There was a special connector electrically compatible with the Apple 1 interface but which required an expansion card to provide the correct physical interface. The board also contained a small breadboard area where custom circuitry and components could be fitted. An example of use of the breadboard area is Tranter's automatic power-on-reset modification using a 555 timer chip. As well as the Woz monitor, the Replica 1 included (integer) Apple I BASIC in ROM to allow quick and easy programming. Memory was provided by a 32K byte 62256 static RAM Chip. Second edition The Second Edition (SE) was introduced in 2006, the redesign bringing several connectors to the board and sacrificing the breadboard area for the associated circuitry. The SE allowed for multiple options for powering the Replica 1: external 20 pin ATX standard PC power supply; 7-9 volt DC jack connector; or optional power via USB port. A serial port was fitted to the board eliminating the need for the piggy-back board. The video output could prove problematic with this version especially on some equipment with the issues likely worse on European 60 Hz based display systems. With the SE version the firmware EEPROM was also to include the KRUSADER symboilc assembler.{Sfn| specifically developed by for the Replica 1. KRUSADER was developed by Ken Wessen, who described its programming environment as including a simple shell, editor, disassembler and a low-level debugger all fitting within a space of under 4096 bytes. Third edition The Third Edition (TE) was introduced in 2008 and replaced the ATMega circuits with a Parallax Propeller chip to control the video output and keyboard input, the resultant space saving meaning a prototyping breadboard area could be re-introduced to the design. Expansion was supplemented by an Apple 1 compatible 44 pin expansion slot and edge connector allowing an Apple 1 compatible add-on card to be directly slotted into the Replica 1. USB was eliminated from this board. Ten anniversary edition In 2013, on the tenth anniversary of the creation