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Re: Glass sided computer cases

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Keithr0 wrote:
> On 7/01/2025 7:18 am, Computer Nerd Kev wrote:
>> Mighty Mouse <"squeak!"@thecheesefactory.com> wrote:
>>>
>>> Many cases now have glass sides. but what about radiation from the
>>> components inside? cases were all metal to shield radiation.
>>
>> Well the fronts always tended to be plastic, so a clear plastic (or
>> I guess top-end models _might_ use glass) side isn't that much
>> different for shielding.
>>
>> Laptops are already unshielded though (mine drowns out weak FM
>> radio stations when it's running), and EM radiation from poorly
>> shielded USB cables (and before that serial cables) are well
>> known in the form of "mouse noise" picked up by PC speaker cables
>> running nearby.
>>
>> The computer world is already a mess of EM noise, so I don't think
>> clear case sides change much. Users could always fit some wire mesh
>> inside the case window if concerned about it anyway.
>>
>> I do quite like this approach to a clear PC case:
>> https://hackaday.com/2019/06/10/somethings-fishy-about-this-computer/
>>
> Back in 1980, we were replacing an IBM370 with a Fujitsu M180 at 
> National Library. During the changeover both system were run in 
> parallel to the point where every desk that had an IBM terminal, had a 
> new Fujitsu one as well. A problem arose when the Fujitsu terminal was 
> switched on, the IBM terminal stopped working. This seemed reasonable 
> to us 🙂 but the customer demanded a fix.
>
> After a bunch of other people had been unable to fix the problem, I 
> was asked to take a look. The terminals were completely dumb, all the 
> smarts were in the controller. Each controller ran, I think, 16 
> terminals with a coax cable between. One thing that I noticed was that 
> the signal return was not ground, the two were connected by a 
> capacitor at the controller end. I tried fitting a bigger capacitor 
> and bingo - problem solved.
>
> The Library's chief engineer asked me to make a report as to what the 
> original problem was. I said electro-magnetic radiation between the 
> long coax cables that were run in close proximity. He nearly exploded 
> at that "You can't say electro-magnetic radiation" he said "The whole 
> place will walk out". So we agreed to just say interference.

LOL

-- 
Have a nice day!..
stay sane, be happy, and enjoy living.

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Glass sided computer cases Mighty Mouse <"squeak!"@thecheesefactory.com> - 2025-01-06 11:49 +1100
  Re: Glass sided computer cases Petzl <petzlx@gmail.com> - 2025-01-06 16:06 +1100
    Re: Glass sided computer cases MightyMouse <"squeak!"@thecheesefactory.com> - 2025-01-07 15:11 +1100
  Re: Glass sided computer cases Xeno <xenolith@optusnet.com.au> - 2025-01-06 18:23 +1100
    Re: Glass sided computer cases Daniel70 <daniel47@nomail.afraid.org> - 2025-01-06 19:36 +1100
    Re: Glass sided computer cases MightyMouse <"squeak!"@thecheesefactory.com> - 2025-01-07 15:12 +1100
  Re: Glass sided computer cases "Gary R. Schmidt" <grschmidt@acm.org> - 2025-01-06 22:35 +1100
    Re: Glass sided computer cases Xeno <xenolith@optusnet.com.au> - 2025-01-07 00:16 +1100
    Re: Glass sided computer cases MightyMouse <"squeak!"@thecheesefactory.com> - 2025-01-07 15:14 +1100
  Re: Glass sided computer cases not@telling.you.invalid (Computer Nerd Kev) - 2025-01-07 07:18 +1000
    Re: Glass sided computer cases Keithr0 <nothing.to.see@here.com.au> - 2025-01-07 11:58 +1000
      Re: Glass sided computer cases Mighty Mouse <"squeak!"@thecheesefactory.com> - 2025-01-07 16:57 +1100
    Re: Glass or perspex sided computer cases Mighty Mouse <"squeak!"@thecheesefactory.com> - 2025-01-07 16:54 +1100
      Re: Glass or perspex sided computer cases not@telling.you.invalid (Computer Nerd Kev) - 2025-01-08 06:54 +1000
        Re: Glass or perspex sided computer cases MightyMouse <"squeak!"@thecheesefactory.com> - 2025-01-08 11:28 +1100
          Re: Glass or perspex sided computer cases Computer Nerd Kev <not@telling.you.invalid> - 2025-01-08 11:12 +1000
          Re: Glass or perspex sided computer cases Keithr0 <nothing.to.see@here.com.au> - 2025-01-08 13:38 +1000
  Re: Glass sided computer cases Petzl <petzlx@gmail.com> - 2025-01-15 12:34 +1100

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