But not these - PDP-11's didn't use dual-height connectors on memory. Anyway, they are indeed PDP-15. (Whether or not they are actually MM15 I don't know). The page on the memory on the provided link indicates:
G100 G613 G614 The modules and options document on bitsavers.org/dec/modules/modulesAndOptions sez.... G100 Sense Amp & Inhibity Driver, PDP15, 3 Wire, 3D Memory Where Used: 15 G613 X Diode Matrix, 3 Wire, 4K, 9/I Where Used: 15 G614 X Diode Matrix, 3 Wire, 4K, 9/I Where Used: 15 JRJ On 12/8/2015 6:14 AM, Johnny Billquist wrote: > Careful. Some PDP-11 memory is also 18 bits wide... 16 bits plus two > parity bits. > > Johnny > > On 2015-12-08 13:03, Pontus Pihlgren wrote: >> I've seen a memory assembly from a PDP-15 and it looks very much like >> this. Also, if each connector pair corresponds to one bit it adds up to >> 18 which matches the word lenght of a PDP-15. >> >> Of course, PDP-1, -4 and -7 used 18 bit word lenght, but they were not >> made with flip-chips. >> >> PDP-9 is made with flipchips and is 18 bit. But I seeem to recall it's >> memory looks quite different. >> >> /P >> >> On Tue, Dec 08, 2015 at 11:58:07AM +0100, Jörg Hoppe wrote: >>> I help cleaning out a large repository of DEC parts. >>> There a quantity of DEC core module assemblies appeared. >>> According to PDF docs these must be PDP-15 MM15's, but no labels are >>> on the >>> boards. >>> >>> I show/offer some of them at >>> retrocmp.com/flipchipshop , >>> under "core memory" >>> >>> Can somebody confirm they are MM15's? >>> Are any PDP-15 running at all? >>> >>> Thanks, >>> Joerg > >
