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Hi Dennis,

On Tue, Aug 20, 2019 at 09:41 AM, Dennis Tillman W7PF wrote:

Hi Dave,
What does a 7704A with a P7001 have to do with curve tracers???
The reason I changed the topic was to separate the discussion about 500 series
scopes from the discussion going on about transistor curve tracers with the
same subject.
Dennis Tillman W7PF

You're right, we strayed.

This is how we got here:
While discussing the modular construction of the 577 curve tracer and the possibility of changing a 577D2 into a 577D1, this happened:

Hi Dave,
Tek sometimes uses this modularity in very interesting ways. I think the 7704 was the first scope they designed to be modular from the start.
The top section is completely removable and held to the bottom section with only a few screws. This was done so Tek could insert the interface
section of the DPO (Digital Processing Oscilloscope) in between the top and bottom of the 7704. The DPO used a DEC PDP-8 minicomputer
to capture data from the 7704 lower section plugins and display the results on the 7704 upper display section.
Tek listed the DPO in its catalogs from 1974 to 1981. In 1981 Tek introduced the 7854 which does all of this in a normal size 4-wide mainframe
using a microcomputer instead of the PDP-8 minicomputer.

Dennis Tillman W7PF

Very relevant historically, interesting and significant but you're right, not ideal for posterity unless searching for content, not topic.

Raymond