when the multi rack PDP11/20 (on the switch panel) was being assembled for delivery to Aeroflote, circa 1971 or 2 iirc, the unit did not have a working power fail recovery capability. The machine was then referred to as an 11/15. At that time, the PDP11 was considered a controlled technolgy item, and there were some guys present for the testing in the mill on 1-2. Anyone familiar with 1=2 at that time, knows the floors did shift with heavy loads. This caused said computer to suffer power failures as the racks shifted, bus cables shifted and the machine would crash. after about the 15th crash, no pun intended, the delivery to Aeroflot was approved. A couple of years later, the Ryad version of the 11 was delivered to a shop, and found to be an exact duplicate of the delivered 11. it dd not have power fail capability. bob
On Sat, Dec 22, 2018 at 7:05 AM Bill Degnan via cctalk <cctalk@classiccmp.org> wrote: > > On Sat, Dec 22, 2018, 3:50 AM David C. Jenner via cctalk < > cctalk@classiccmp.org wrote: > > > Are you sure the referenced early PDP-11/10 wasn't really the PDP-11/15? > > We got an 11/15 because it was cheaper and DEC had one sitting around > > that we could get with end of year left over budget funds. > > > > Yes. The "11/15" did not exist in 1969 early 1970 documents from DEC and > articles, including the original product brochure and pricelist: > > https://www.vintagecomputer.net/browse_thread.cfm?id=593 > > Bill
