aveng:
TN 727's definately had 1 INU - used to link it to the autopilot through the AUXNAV selection. Waypoints had to be manually input, from memory they could have 10 at a time. 727 was a mighty machine - built like a brick sh!thouse and quick too.
Our L1011s and 747s all had 9 lat/lons at a time.