What was the most common business computer system of the late 70s, just before the Apple II and CP/M really started proliferating?
For concreteness, let's say we are talking about a U.S. company on the order of 100 employees, in the business of something other than computers or electronics, having a need to process orders, payroll and so forth. What would they most often have? IBM? DEC? What sort of mix of in-house operations and contracting? Was there a lot of diversity, or was there a fairly standard setup?