Zet is a clone x86 processor where its machine code compatible with x86 processors developed as an effort to make open-hardware processor.
The hardware design can be synthesized in a configurable device such an FPGA, CPLD, or on custom ASIC, and is considered as SoC
As of now, the project only supports 16-bit and able to run DOS-compatible or Windows 3.x operating systems.
References
Zet (hardware) Wikipedia(Text) CC BY-SA