I am working on an adapter to connect a Xerox Docutech keyboard to a modern computer. This keyboard used a specialized, keyboard/mouse interface that does not have a modern counterpart. I have a schematic for the interface but I am uncertain about a symbol it depicts. As you can see below, the KbrdData + and - lines connect to what looks like a differential pair that generates a single, "DataFromKbrd" signal. They look a bit like op-amps... but I have no idea how those would help in this situation. What exactly are these components? How would I go about making one out of modern parts?
Based on the vintage, I'd bet an Internet Doughnut that it's a 26LS32 differential receiver. http://www.ti.com/lit/ds/symlink/am26ls32ac.pdf