8 Dec
2015
8 Dec
'15
6:01 a.m.
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, J?rg 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