Analog would be like what was in the ACES hybrid digital/analog simulator that Jack Simpson built at Huntington Beach MDAC-W with a Honeywell digital computer as supervisor and a lot of transistor amplifiers (I don't think OpAMPs yet) to fly QUICKTURN, vectored nozzle missiles against simple target in plane maneuvers.
Analog would be like the MA-6A/MA-7A Bomb-Nav (Bombing/Navigation) system used on the B-47 and B-52 in the '50s and '60s, which operated on servo mechanisms, gear trains, 3 dimensional cams, and even a few vacuum tubes. They were surprisingly decent computers, but very large, heavy and expensive, not to mention maintenance intensive.