Old IBM keyboards

I have probably 50 or more IBM Model M from POS terminals. They have a plug that looks like Ethernet. I don't know what that plug is called, maybe AT? I'd like to know exactly what it is.

Pnutfarmer, does the connector look like this?



That's an RJ45 connector -- the kind you use for your Ethernet port.

Looking around a bit apparently industrial grey ones are even rarer? and thats what this one is

Came out of an early 90's mopar diagnostic machine, even came with a kind of cool mopar performance monitor.