PDP-11/34 verses a PDP-11/39

Sorry for top-posting, but that is how this thread goes ... I cannot check at this moment the difference between the 11/05 and 11/10 because they are both in storage. However, I seem to remember that there are differences between the 11/35 and 11/40 (where the 35 was for OEM). The 2 ribbon cables from the console (at the rear side) are at opposite sides for the 35 and the 40 (IIRC). - Henk -------------------------------------------------- From: "Paul Anderson" <useddec at gmail.com> Sent: Tuesday, June 25, 2013 5:32 AM To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Subject: Re: PDP-11/34 verses a PDP-11/39 > Sounds like the same marketing idea as the 11/15-11/20, 11/05-11/10, > 11/35-11/40 and the 11/45-11/50. I think they changed product lines and > oem > ideas about that time. > > Thanks, Paul > > > On Mon, Jun 24, 2013 at 8:59 PM, Lyle Bickley > <lbickley at bickleywest.com>wrote: > >> When I saw Jack Rubin selling a PDP-11/34/39 manual on eBay, I had to >> buy it. I thought perhaps the "11/39" was just a misprint - but... >> >> The preliminary manual is titled "PDP-11/34/39 USER'S GUIDE" and is (c) >> 1975. Below the copyright is: "Written by PDP-11 Engineering". >> >> In perusing the manual, I quickly went to the section describing the >> two systems. Here's the opening paragraph in section 3.1: >> >> "PDP-11/34 AND PDP-11/39 SYSTEM DESCRIPTION" >> >> "The PDP-11/34 and PDP-11/39 Computer Systems consist of a set of >> modular building blocks combined to suit a customers needs. The >> PDP-11/34 System is designed for original equipment manufacturers >> [OEM's] while the PDP-11/39 system is designed for end users..." >> >> The manual then defines the "basic components" of each system. >> >> Both contain a KD11-E central processor, KY11-LA Operators Console, >> Unibus, M9302 Unibus Terminator and Core or MOS memory. >> >> The differences are: >> >> The 11/34 contains: >> >> M9301-YA Terminator/ROM >> >> The 11/39 contains: >> >> M9301-YB Terminator/Boot/Diagnostic >> DL11-W Serial Line Interface >> M7850 Parity Controller >> >> My guess is that DEC Marketing decided that only one system model made >> sense - and the original "11/34" configuration was scrapped and the >> "11/39" configuration became the 11/34 we know it... >> >> The manual also contains a number of hand written notes and >> corrections - and on first view looks to be substantially different >> than the "PDP-11/34 User's Guide" we 11/34 fans have come to >> appreciate. >> >> Cheers, >> Lyle >> -- >> Bickley Consulting West Inc. >> http://bickleywest.com >> >> "Black holes are where God is dividing by zero" >>