WIP: internal 512K expansion

[eto]

I'd love a version for my CPC 664. Any progress on that version?

The version that I have shown on May 27th is basically finished. However a last new revision for the PCB is required which will be ordered and tested after the summer holidays. I would expect that it can be released in later October or November. 

[sir_lucas]

That's great!! Thank you. Really looking forward to it.