John Holden johnh@psych.usyd.edu.au says: The cabinets from left to right are probably :- 1) TU-10 tape drive (almost completely obscured by ken) 2) RF-11 disk controller (panel at top of cabinet) 3) RK03 disks (apparently compatible with RK05's) 4) TU56 DECtape (the beasts were block replaceable and could behave like a disk drive) 5) TU56 6) PC-11 paper tape reader/punch. There is just a glimpse of a PDP11/35-45 hidden by the second ASR33 under the punch (probably 11/45). 7) PDP11/20. It's not one of the earliest, since you can clearly see the /20 on the decal. 8) In the shadows to the right is a VT01A display (Tektronix 611 storage display) Warren adds: According to the PDP-11 FAQ at http://www.village.org/pdp11/faq.pages/11model.html, the 11/20 was introduced in June 1970. Dennis Ritchie says that the 11/20 ``came during the summer of 1970'', that being the Northern Hemisphere summer. It came without any disks; they arrived several months later. Therefore, the photo must date from the end of 1970, or 1971.