I think this was one of the first “inside the armor” shots of Iron Man. At least, it was the first one in The Avengers. Avengers #201 also featured a Jarvis backup feature that was serviceable but not groundbreaking. I think Marvel was trying to turn Jarvis into a bigger character, like Batman’s Alfred, but they never really gave Jarvis all that much to do. He’d have a few panels here or there, but never with enough regularity or consistency that he really mattered as a character.
Then, of course, they killed him and turned him into a computer. Then he was revived again but not really put to good use.