Comment by homarp

The W65C816 is a 16 bit version of the 6502 CPU.

The 32 bit version, called the W65C832, only exists as a datasheet This is a FPGA version.

"builds with the regular opensource FPGA tools: yosys, nextpnr-ice40, icepack, and iceFUNprog. I recently added support for the Tang Nano 20k board (should work with the 9k model too)"