I have M24 SP fully working sans keyboard and trying to figure a way to get keyboard working (without paying insane eBay prices). There is this document floating around:

https://theretroweb.com/motherboard/manual/ca … 80474795444.pdf

describing motherboard and etc and interestingly it lists ANK25-102 with "Standard AT" protocol? ANK25-102 is rare beast but it does have db9 connector as the rest of Olivetti /AT&T keyboards. Would it be reasonable to infer that an AT keyboard (any PS/2?) can be made to work with M24? Contrary to this, "Theory of operation" document states that all three compatible keyboard types have same circuitry..