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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

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Old 15th Feb 2012, 4:14 pm   #1
michael cumming
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Default Sharp desk top Compet CS-1117 calculator, Age??

I picked up one of these for £1 today, it runs on two D cells, No faults as its fully working and has a green LED display, its not a Nixie tube though but when i took a look inside its a long tube with a sealed pip a bit like a radio valve. I wonder what the age of this is, i guess 1970s but i have checked online but cant find the model i have, This does not have a built in printer like some did. It can be used with an adaptor that is 4.5V. It has lots of patent numbers on for each country including the Uk, made by Sharp corporation Japan.
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Old 15th Feb 2012, 4:23 pm   #2
Nickthedentist
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Default Re: Sharp desk top Compet CS-1117 calculator, Age??

Are you sure it's not got a vacuum fluorescent display (VFD), as used in 1970s clock radios and early 1980s video recorders, Michael?

Like this?

http://www.wellgainelectronics.com/P...S%20W2P209.JPG

Also, early LEDs were usually red; they're cheaper and more efficient than the other colours.

N.

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Old 15th Feb 2012, 6:20 pm   #3
michael cumming
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Default Re: Sharp desk top Compet CS-1117 calculator, Age??

That's the one Nick, thanks for that as I did not know the name of the component and did not want to remove it from the housing. Early LEDs were red as I have a Rockwell calculator with a red display. The Nixie tubes look like radio valves so it's not them. I don't think these things are rare but early red LED display types are sought after, some early digital watches used red LEDs too.
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