I've found some time to put into the Osborne again!
I've been trying to identify which chips are used by the Osborne on start-up. That way I can just target those chips and not worry about the others until later on if the need arises. The technical manual does a terrible job of explaining any sort of allocation and much less which chips that would translate to. Can anyone explain how the Osborne selects which chip to access? These chips don't have any kind of chip-select pin, and I'm not sure how they distinguish their addresses without one.