To the 2901 bit slicers out there

emanuel stiebler emu at
Mon Jan 8 08:55:19 CST 2018

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:
>> 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!

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