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-sli…
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!