The C-One is a single-board computer designed by Jeri Ellsworth, a self-taught designer, and Jens Schönfeld from Individual Computers, who manufactured the boards themselves. It was initially created in 2002 as an enhanced Commodore 64 home computer, but has been reengineered to allow cloning of other 8-bit computers.
The machine uses a combination of configurable Field-Programmable Gate Array (FPGA) chips and modular CPU expansion cards to create compatibility modes that duplicate the function of many older home computers. The default CPU is the 65C816 CPU which is used in Commodore 64 compatibility mode as well as the C-One's native operating mode. The C-One is not merely a software emulator, it loads various "core" files from disk to configure the FPGA hardware to recreate the operation of the core logic chipsets found in vintage computers. This provides for a very accurate and customizable hardware emulation platform. The C-One is by no means limited to recreating historical computers - its programmable core logic can be used to create entirely new custom computer designs. In 2004 the platform was expanded to include an Amstrad CPC core made by Tobias Gubener. In 2008 the platform was expanded to include an Amiga core. So far, C-One circuit boards have been produced by German company Individual Computers, and they currently sell for €269. 
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