On 04/24/2018 03:10 PM, D. Hugh Redelmeier via talk wrote: > First, lets think of a neon tube. It gets turned on when a high > voltage is applied. With no voltage, no light. But once it has > started, an intermediate voltage can maintain the light. If it > hasn't started, that voltage will leave the tube off. So, powered by > that voltage, the tube is a memory. You can tell its state by the > amount of current it draws.
Neon lamps have long been known to have a memory effect. Many years ago, I worked on an ancient system, made by Teleregister, at the old Toronto Stock Exchange on Bay St.. It used neon bulbs for some storage. It also used a memory drum and flip flops built around 4 vacuum tubes. One of my first tasks in the morning was to slowly crank up the filament voltage, for all the vacuum tubes in the system. I also had to start a motor/generator set, to provide +/- 130V DC to run it. Go to the link and search on Teleregister for a description. http://www.torontoghosts.org/index.php/the-city-of-toronto/public-buildings/122-the-former-toronto-stock-exchange-current-design-exchange-?showall=1&limitstart= That system was installed over a year before I was born! --- Talk Mailing List [email protected] https://gtalug.org/mailman/listinfo/talk
