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=                               C-One                                =
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                            Introduction
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The C-One is a single-board computer (SBC) created in 2002 as an
enhanced version of the Commodore 64, a home computer popular in the
1980s. Designed by Jeri Ellsworth and Jens Schönfeld from Individual
Computers, who manufactured the boards themselves, the C-One has been
re-engineered to allow cloning of other 8-bit computers.


                               Design
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The machine uses a combination of configurable Altera
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 W65C816S (by
Western Design Center) 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 a card 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
not 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 2006, Peter Wendrich ported his FPGA-64 project (originally
intended for a Xilinx FPGA) and enhanced it for the C-One. This core
supported both PAL and NTSC machine emulation, and aimed to be
cycle-exact and emulate many of the bugs and quirks of the original
hardware.

In 2008, after development of an "Extender" card which added a third
FPGA, Tobias Gubener added Amiga 500 compatibility by porting Dennis
van Weeren's Minimig code to the board. This core replaced the
physical 68000 CPU and the PIC chip from the original with his own
TG68 CPU core on the FPGA.  developments to this core include features
not possible with the original Minimig board.

In 2009, Peter Wendrich released a "preview" of a next-generation C64
core called "Chameleon 64", with a greatly expanded specification
compared to his earlier core. A new version of the CPC core was also
released in mid-2009, featuring an embedded SymbOS core for control of
device emulation, and a clock unlocked mode for CPU speeds of up to 80
MHz.

So far, C-One circuit boards have been produced by German company
Individual Computers, and they  sell for €333 with the FPGA extender
card.


                              See also
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* C64 Direct-to-TV
* Sprinter (computer)
* 1chipMSX


                           External links
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*
* [http://wiki.icomp.de/wiki/C-One Wiki]
*
[https://web.archive.org/web/20110118064507/http://www.particles.org/forums/
Retroputing's forum on the C-One]
*
[https://web.archive.org/web/20011229234454/http://groups.yahoo.com/group/CommodoreOne/
Yahoo's C-One Group]
*
[https://archive.today/20130209233009/http://groups.yahoo.com/group/cone_cores/
Yahoo group for technical discussion about development of cores for
the C-One]


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