I have been going thru my garage and have found that I still have a system 9 MPU out of a Comet.
As I remember it works fine, but needs the power resistors replaced.
I have the resistors in a box somewhere, but after I sold my comet I just didn't ever get around to finishing this board up & now I don't have a machine to test it out in.
So I'm offering it as-is with the comet ROMs (plus the resistors if I can find them) for $100 + $25 shipping (US).
Robert