On 17 Jan 2010 at 13:54, William Donzelli wrote: A quick web search turns up only monochrome photos. Fortunately, there seems to be no shortage of documents on the thing scattered about. For someone who wanted to recreate a vintage design in SSI or discretes, this might make a good candidate. Any software, however limited, would most likely survive on paper tape and I don't know if any of that still exists. The "Patty Duke Show" episode that featured the 422 is "The Genius" which aired on 9/25/63, which was the second episode of the series. It's on YouTube: http://www.youtube.com/watch?v=54zgRfUMLc8 You can see the 422 in operation, starting at about 4 minutes in. That young man with Patty is none other than Paul Lynde. Note the Simpson 260 VOM sitting on the table. --Chuck

On 17 Jan 2010 at 17:46, William Donzelli wrote: Rectangular slots in the panel? Otherwise, your eyes are better than mine. Hmmm, one could build a whole computer using 6977s as the active device. Wouild make a heckuva glow-in-the-dark display... Cheers, Chuck

Are those similar to the DM160s used in Europe? Those are sub-minature triodes (about 1" long and 1/4" in diameter with 4 connections -- the 2 ends of the (1V or so) filament, control grid, and fluorescent anode. You need about 24V on the anod to get it to glow, and a -3V grid bias will curt the valve off and stop it glowing. They were used as indicators on computer/paper tape equipment in the 1960s (and then LEDs came and sp[oilt the fun!). I have mever tried cross-coupling a pair to make a flip-flop, now that would be an interesting project.... -tony