From: Pontus Pihlgren
Sent: Tuesday, December 08, 2015 11:52 PM
> On Tue, Dec 08, 2015 at 09:42:27PM +, Rich Alderson wrote:
>> Flip Chip technology was invented for the PDP-7, after the failure of
>> the large System Modules used in the PDP-6.
> What where the failure(s) with System Modules
On 12/8/15 11:52 PM, Pontus Pihlgren wrote:
What where the failure(s) with System Modules in the PDP-6? cost?
reliabilty?
Connectors. They had over the top and backplane connectors. They also
had problems with solder joints on rivets used for connecting traces
on the front and back side of th
On Tue, Dec 08, 2015 at 09:42:27PM +, Rich Alderson wrote:
>
> Flip Chip technology was invented for the PDP-7, after the failure of the
> large System Modules used in the PDP-6. The only part of the PDP-7 which
> uses System Modules(TM) is the DECtape controller for the 555 DECtape
> drives.
From: Pontus Pihlgren
Sent: Tuesday, December 08, 2015 4:03 AM
> 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
2015-12-08 15:01 GMT+01:00 Jay Jaeger :
> 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 module
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/module
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 ma
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
