C-One

C64 replica C-One

The C-One is a replica of the 8-bit C64 home computer from Commodore from the 1980s. The American Jeri Ellsworth began a complete redesign of the C64 in 2000, which, in collaboration with Individual Computers , resulted in the delivery of the first C-One boards in ATX format in 2003 . Meanwhile, Jeri Ellsworth is no longer involved in the development.

Standard components are used for the design. As processor one for comes MOS 6502 compatible 65C816 - CPU having a clock frequency of about 20 MHz , 24-bit address space and an extended command set to access memory above 64 KB is used. A programmed brake ensures that old C64 software is executed correctly . The C-One also has a processor slot which can be used to retrofit almost any 8-bit processor using an adapter board , such as a real MOS 6502 or a Zilog Z80 .

The C-One is considered the first reconfigurable computer: The functions of the custom chips of the C64 are in the C-One is not hard-wired ( hardwired ), but can be reprogrammed (reconfigured) are. The C-One uses two Field Programmable Gate Arrays (FPGA) for this. This means that the C-One can also imitate other 8-bit computers such as the Schneider / Amstrad CPC in terms of hardware. In the meantime, the NatAmi project also exists , in whose first prototype a C-One is used to simulate an Amiga with a 32-bit CPU 68060 . In this project, however, the development of own hardware is planned for later.

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