On 2017-12-27 21:35, Randy Dawson via cctalk wrote:

What have you done, with microprogramming this part?  In your architecture,  
have you changed the microcode, create an instruction to enhance your machine?
I would be interested in any hardware projects, stories (or even in the FPGA, I 
hear its a popular thing to copy);

I hope you saw this one. Fresh on opencores:

https://opencores.org/project,am9080_cpu_based_on_microcoded_am29xx_bit-slices

cheers

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