Do any of the odd sized forth cpu’s exist any more like the MuP21 or the I21?
Are there any FPGA versions?
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Yes, I was going to point you to the GreenArrays web site where you can buy chips like the GA144 which has many F18 Forth processors connected together (144 processors for 18 bits each, as their names imply) but it doesn’t seem to be working right now.
The old FPGA implementations should work on modern FPGA boards or should be easy to adapt if not.