Thanks a lot for sharing this with us, Noel! I was looking for such information on the H960 cabinets in the past and this covers it all. Best regards, Pierre ----------------------------------------------------------------------------- http://www.digitalheritage.de Am Freitag, 28. Mai 2021, 16:02:54 MESZ hat Noel Chiappa via cctalk <cctalk at classiccmp.org> Folgendes geschrieben: So, I have images of two different pieces of DEC documentation for the H960 series of racks/cabinets (the H950 is the bare rack; the H960 is the rack complete with various appurtenances such as side panel, stabilizer feet, etc). I had a request for them, so I've put them online. They are: ? http://ana-3.lcs.mit.edu/~jnc/tech/H960/DEC_cabinets1.jpg ? http://ana-3.lcs.mit.edu/~jnc/tech/H960/DEC_cabinets2.jpg The entry in the Direct Sales Catalog which covers them; includes illustrated breakdowns, and the DEC part numbers for everything. ? http://ana-3.lcs.mit.edu/~jnc/tech/H960/DECRackManual1.jpg ? http://ana-3.lcs.mit.edu/~jnc/tech/H960/DECRackManual2.jpg ? http://ana-3.lcs.mit.edu/~jnc/tech/H960/DECRackManual3.jpg ? http://ana-3.lcs.mit.edu/~jnc/tech/H960/DECRackManual4.jpg ? http://ana-3.lcs.mit.edu/~jnc/tech/H960/DECRackManual5.jpg The Assembly Guide; it shows in detail how all the bits go together (includes all the captive nuts, bolts, etc). ? ? Noel

I think this might have been part of a general DEC change in version numbering conventions. The earlier rule was that the first number is the major version, the letter is the minor version. As of V7 it changed to major number dot minor number. In either case, the dash number suffix is the baselevel number (development build cycle number). Those typically restart at 0 or 1 for each release, so V5C-01 indicates only one baselevel was done for that minor release. That may not be true in all cases; I doubt that V4B had 17 baselevels so that number probably wasn't reset between V4A and V4B. The definition of "minor release" was not always applied consistently. For example, V6B was the first release that was built natively (using RT-11 emulation) rather than using DOS. And its the first release that did bus probing at startup to figure out the peripheral configuration and adjust the running monitor to match. That seems like a pretty large change, but for some reason it didn't prompt a new major number. The notation change happened part way through the V7.0 development cycle. I remember a memo from management entitled "RSTS V7A canceled" :-) . Sometimes version numbers seem to be missing. I don't know if anyone ever saw V1, and I also never saw V3B though I have seen V3A and V3C. paul

On 31/05/2021 15:04, Paul Koning wrote: Looking at them I guess RT-11 does something similar: V2, V02B, V02C. I can (just about :-)) cope with the seemingly optional leading 0, but would there have been a V2A? There was for IAS. Actually IAS had V3, V3.1, V3.2, V3.2A, V3.2B and V3.2C. So IAS went major.minor in a sort of half-hearted way :-) The "80th Birthday Memo" (http://www.silverware.co.uk/rsts_80th_birthday.htm) says that V1 never made it out of the door. V2A-19 was the first to ship. The "DEC 1957 to he Present" book (http://gordonbell.azurewebsites.net/digital/dec%201957%20to%20present%20197…) confirms the FY in which RSTS-11 shipped but not the version number. The earliest manuals online seem to be the V4.x ones available on bitsavers. Antonio -- Antonio Carlini antonio at acarlini.com