Others have better info on this than me... I'm going to _guess_ that it was the earlier caption; I definitely recall reading somewhere (maybe that history thing I already provided a link to) that when the PDP-11/20 first arrived, DEC didn't have a disk drive for it, and so it sat in a corner for some months (running some chess problem) until the disk arrived. So that argues that it was a very early production machine. Noel