DEC VRE01 terminal documentation

Here's a photo of one of the restored PLATO terminals (which had the plasma display) Does the power supply for the PLASMA look like the one in this photo of one of the terminals with the covers off? ----- Original Message ----- From: Aaron Woolfson To: paulkoning at comcast.net ; uban at ubanproductions.com ; cctalk at classiccmp.org Sent: Thursday, August 13, 2020 1:50 PM Subject: Re: DEC VRE01 terminal documentation Hi Tom. Thanks for your message. Well, the Plasma panels use a pretty unique. I'm attaching the precise waveforms that the Plasma Panel expects to see in order to achieve the illumination of the dot. And while this may not be exactly or precisely what you're looking for, this will explain much about the technology involved. The fact that you can see any illumination at all is perhaps the most important part - beacuse the gas is probably there, and the "actuation" voltage might just not be high enough, or the sustainer voltage might have an issue. The power supplies were manufactured by Electro Plasma and were typically separate from the actual unit itself. I am going to see whether I can find the schematics for those power supplies, which discuss the characteristics . Also, check to see whether the back of the plasma panel itself has an edge connector that is similar to the attached TYCO specified connector. That might give you some insights into where to go. When I gave all my equipment and test gear to the LCM up in Seattle, I am pretty sure that they also got a lot of the original manuals and notes that had been hand written. But I typically had scans of most everything. I will see what I can find.... ----- Original Message ----- Subject: Re: DEC VRE01 terminal documentation Date: Thu, 13 Aug 2020 16:38:39 -0400 From: Paul Koning <paulkoning at comcast.net> You may want to see if the PLATO terminal documentation is any help, look on Bitsavers under University of Illinois. Those plasma display power supplies are hairy devices; the panel is actually a memory device and the power supply produces a high voltage AC waveform to make that work. Those panels normally light up around the rim; the fact you see that briefly but not sustained gives some hope that adjusting may be all that is needed. That's quite a display; the usual plasma panels were 8 inches square, 512 by 512 pixels. I'm guessing this is a 1k by 1k pixel display, which I have seen once or twice, at SAI in San Diego in some military displays. I know a plasma terminal expert; I've forwarded your message to him. paul