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These are fully working drop in replacements for the rare 40010 in the Amstrad CPC 664 or 6128, and some models of the CPC 464.
The project page is here -
https://github.com/codedchip/AMSGateArray
There are currently no known bugs, but it would help the project creator out greatly if any could be report via the above Github.
I will also sell these with the understanding that if there is a future update in the firmware you can send them back to me at your own expense (postage both ways) and I will update them free of charge.
All the devices I put together come with a 90 Day Return to Base Warranty.