> > > This is a known 'artifact' in PDP-11 history. DEC originally used the /10 > designation for a cost-reduced 11/20. They never produced any, AFAIK - I'm > pretty sure (without checking) that machine was re-labelled the /15, and > those > _do_ exist (I used one BITD). > > According to DEC documentation, the /15 has a KC11 processor, not the KA11 > of > the /20 (although I've never been able to find out much about the KC11 - I > suspect it was a slightly modified KA11); the main functional difference > listed is that it only supports one level of interrupt, not four; > power-fail > re-start is also optional, not standard. > > I have this bit set that both the /15 and /20 could be had with the > 'simple' > front console, that that wasn't the differentiator between them. > > The later /5-/10 pairing does indeed exist - I have one of each. They are > absolutely identical except for the printing on the faceplate. > > Noel >
The 11/15 was not part of the original launch. The original PDP 11 /10 and /20 use the same KA11 processor. Sources Original product brochure http://vintagecomputer.net/digital/PDP11-20/PDP11_Brochure_1970Feb.pdf Datamation 1/1970 and Electronics Jan 1970: http://vintagecomputer.net/digital/PDP11-20/PDP11_Articles_1970Jan.pdf -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
