26 Aug
2025
26 Aug
'25
8:17 a.m.
Wow. Do you have pics of the RK03's? I had a set on my pdp8/I back in
the day, they were reliable but loud things...
C
On 8/26/2025 10:51 AM, Martin Eberhard via cctalk wrote:
Interesting
for Tesla’s early history, but skip to 49:00 for a nice rack
he is putting together
with an 11/20.
https://youtu.be/88KHfX_kPIY
He also appears to be on the cctalk list.
:-) Yes, I'm on this list. I was surprised to see Kim Java show that
snippit of my PDP11/20 restoration project. I wasn't even aware that the
camera was rolling at that point!
So far, the CPU and the extended arithmetic element seem to be working
great. I've got my own SRAM board
<https://deramp.com/downloads/mfe_archive/005-Documentation%20and%20Code%20by%20Martin/PDP11%20Stuff%20by%20Martin/Unibus%20Boards/Unibus%20RAM0ROM-Bootstrap/>
in it. The RX211 is also working great, as is the DL11. I'm in the process
of restoring the RK11 disk subsystem (RK03 Diablo drives, external
controller). I can now read, write, and format on one of the drives. The
other has lots of work to be done. I need to tear both drives apart enough
to replace the rotted foam seals for the air-blower interface, and the
rubber strip on the front door. I am also considering cleaning and
re-lubricating the bearings on the positioner assembly. as they feel a
little crunchy. Amazingly, I just bought new air filters for the Diablo
drives!
While I'm here - I looking for a second rack for that machine. Does anyone
have a DEC rack that's age-appropriate for the PDP11/20, and that you'd be
willing to sell? How about side panels?
Martin
On Sun, Aug 24, 2025 at 10:36 PM Kirk Davis via cctalk <
cctalk(a)classiccmp.org> wrote:
>
>
>
Interesting for Tesla’s early history, but skip
to 49:00 for a nice rack
> he is putting together with an 11/20.
>
> https://youtu.be/88KHfX_kPIY
>
> He also appears to be on the cctalk list.
>
>
>