If someone sent Alexander from KBDbabel an IBM Displaywriter keyboard, I think he would make a protocol translator for one. He told me he would really like to make one and said he might even be able to do it by seeing photos of the PCB/Controller. I've seen other keyboards that have parallell interfaces and same pins missing from the connector, so a Display Writer translator might work for other parallel interfaces as well.
Anyone in Europe have a display writer and want to send it to Alexander in Cologne Germany?
I would chip in on shipping costs.
I haven't pulled mine apart, maybe I will try that and sending him a photo first, unless someone has a photo already.
EDIT: Updated OP to say AT
compatible which is what I meant. It's possible there is an older keyboard than an IBM AT that is AT compatible.