Except the "read only" scene never made it to the final cut of the film. While I personally prefer the special edition version of the garage scene, the theatrical "The more contact with humans I have, the more I learn" is actually a better match for the first movie, where it implies that the Terminator does incorporate new info into it's behavior set rather than being set to a pure read only.Anyway, the ones sent into the past are just following normal infiltration protocols. No command signal. Chip set to "read only".