I strongly suspect there has never been a "map" command in the original Zork trilogy. There certainly was no such thing when Infocom released the games in the early 1980s. (I don't think they yet had the technical capacity for one thing.) Beyond Zork, around 1988, was the first Infocom game to include an internal map.

Infocom did, fairly late, release all three original Zork games, as part of a single trilogy package, with some alterations like in-game hints, which I never got. I have never heard that Zork Trilogy release included internal mapping, however.