RSX11M+ HP7550 plotter?

[Chris Jordan]

I noticed that when I boot RSX11M+ in my PiDP-11 that there's a comment at the end of the boot messages, in the section about LAT Terminal configuration:

>; TT15: is HP7550 port 3 on DS21

I would like to know a little more about what that means.  I very briefly looked through the simh docs and I don't see anything about a HP7550 plotter device, which I guess is what this would be.  Does anyone know?

Thanks,

Chris Jordan

[Johnny Billquist]

That has nothing to do with simh. Whoever created that RSX image put
that stuff in, and you need to ask that person.

Johnny

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Johnny Billquist || "I'm on a bus
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[Chris Jordan]

Johnny,

Thanks, I did get a direct reply from that person, it was left as an example: 

"That is a comment left from an old RSX system that used a reverse LAT connection to a DECterminal server 200 (named DS21) to set up it’s serial port 3 to TT15:on the RSX system which had a print queue to spool plots to a HP7550 8 pen plotter. I left it to provide an example of how that was done."

I remember in college carrying plotter pens and paper with me at all times, since the department provided HP plotters but not pens or paper.  

Chris Jordan

[Chuck McManis]

It should be possible to attach a program to that which pretends it’s a plotter and dumps out vector files that Inkscape could read/print

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[Manuel Maseda]

If you want the real thing I can sell you a genuine DEC LVP16 pen plotter !!

Manuel