PDP-9 lives again....

From: Tom Uban <uban_at_ubanproductions.com>
Date: Fri Aug 30 14:41:00 2002

Very nice!

For a temporary X/Y screen solution, you might consider using a display
from any
of the Atari vector graphics games, such as Asteroids. They should be cheaply
available -- most were made by Wells Gardner.


At 09:19 PM 8/30/2002 +0200, you wrote:
>Some 20 odd years after it was decommisioned we finally got our PDP-9 to
>boot software off an old DECTape. Advanced Software System version 5A
>came up today for the first time on our restored -9.
>This after a long and frustrating summer when we spent over 100 man hours
>chasing a processor fault which resulted in the execution of the saved PC
>value after an interrupt (instead of the word after the saved PC value).
>Turned out to be a misaligned delay circuit which caused a reset signal to
>arrive late and provoke all sorts of havoc in the processor while nicely
>reseting all the tell-tales.
>Seems like the memory and processor hardware is quite stable now. We have
>two DECtape units attached with two more units availabe to be attached.
>Further debug on the DECtapes and learning the software will be followed
>by attachemnt of TU20 mag tape units.
>If anyone knows of an available (and cheap) large X-Y plotting scope
>preferably somewhere in europe we would be very interested in hearing from
>you. We have a graphics controller but no large screen. With the screen,
>the DECtapes and the TU20's this is going to be one impressive system.
>We also used the -9 for the first time today to try and recover an image
>from an old Elliott 903 paper tape I was given in the UK recently. Due to
>operator error that attempt failed but I fully expect to be able to get a
>tape image this weekend.
> -- hbp
Received on Fri Aug 30 2002 - 14:41:00 BST

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