On Mar 27 2006, 19:00, Jay West wrote: guess it complete set exactly times. with Actually DEC took a lot of care over diagnostics. All systems were sold with comprehensive relevant diagnostic media, normally accompanied by the listings. In the early days the listings were on paper, but later on microfiche. Furthermore, DEC maintained those diagnostics carefully, and there were regular revisions and patches when necessary which were sent out to customers who had maintainance contracts. I don't know about the paper listings, but microfiche was certainly sent out (inserting the updates used to be one of my jobs). In fact, there's the problem -- when you do find listings, which have often been separated from the machine and media they originally were meant to be with, they may be for a different revision or patch level. The code will be close, and the listings may be useful, but may not be quite the same. Paper listings in particular will usually be for older versions of the diagnostics, and many diags came along late enough that the listings were only on microfiche. A full set of PDP-11 microfiche diagnostics listings, such as might have been held by a Field Service office, reseller, or a third party maintainer, is one whole microfiche box, some 14" deep. There would normally be another box beside that with the hardware documentation: manuals, engineering drawings, parts lists, illustrated parts breakdown, field and engineering change orders, etc. -- Pete Peter Turnbull Network Manager University of York