On Fri, Aug 2, 2019 at 5:04 PM Warren Toomey <wkt@tuhs.org> wrote:

On Fri, Aug 02, 2019 at 06:49:19PM -0400, Jim Carpenter wrote:
> On 8/2/19 4:14 PM, Warren Toomey wrote:
> > Hi all, I'm chasing the Youtube video of the PDP-7 at Bell Labs where
> > people are using it to draw circuit schematics.
>
> A Bell Labs video? The only Bell Labs video I remember seeing that had
> someone doing circuit schematics had it being done on a PDP-5. The -7 was
> shown later doing music stuff. (That's the -7 that I thought maybe Unix
> started life on.)

Thanks Jim, Is it this one?
https://www.youtube.com/watch?v=iwVu2BWLZqA

They mention a Graphics-1 device, so maybe I'm getting this confused
with the PDP-7 and the Graphics-2.

The early one for the circuit simulator is definitely on a PDP-5 and I presume the Graphics-1 display. You can see the PDP 5 letters on one of the cabinets. How do you know that the music was composed on the PDP-7 that appears from 9:20-10:30? Cool paper tape feeding sequence, though, you gotta admit :) (well, unless you waited for far too many of those to run back in the day).