DEC MM15 core mem found
mattislind at gmail.com
Tue Dec 8 13:37:26 CST 2015
2015-12-08 15:01 GMT+01:00 Jay Jaeger <cube1 at charter.net>:
> 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:
> 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
I also happen to have a few that need a new home - I have no PDP-15. Trade
for something interesting...
> 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
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