On 2018-01-07 19:46, ben via cctalk wrote: > On 1/6/2018 4:01 PM, emanuel stiebler via cctalk wrote: >> 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 >> > > I don't expect many people will copy that. A FPGA 8080 runs darn fast as > is. Ben.
And I don't expect people in this group to look for "fast". I think they are interested in "cool" or historically significant. And it is cool, that finally somebody took the am9080 application note and put it into an FPGA. It is a nice start to a lot of bit slice designs. > PS: I plan to have some sort of 20 or 24 cpu bit 2901 running in a DE1 > FPGA this spring. 3 - 7 bit bytes (21/20 bit wide memory for the 20 bit > CPU) or 3 - 8 bit bytes with a 24 bit cpu. Might need to order more > Front panel switches how ever. Good luck!
