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Old 29 May 2020, 00:17   #1
brett71
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Building an A1200 from parts - have simple question

Hi all,

I'm in the process of building up an A1200 from parts. (Phil's A1200 case, original keyboard, ReAmiga 1200 motherboard, modified PC floppy drive, IDE to SD adapter, etc.)

My question is regarding the RF shielding, as it is the only part I am lacking. How essential is this? I do not have any sets of the RF shielding, and just want to be sure that it's not required for any reason, or if it is required, why? The only reason I can come up with is to provide some sort of support to the connections on the back of the machine, but even on a 500, this doesn't seem that critical.

Thanks!
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Old 29 May 2020, 00:40   #2
aeberbach
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Not at all essential - only required for emissions regulations back in the day. You may find that without shielding it causes interference on sensitive devices - like if you put it on top of a guitar amp turned up you may hear some hum or other noise, sometimes even modulated with memory access or screen patterns. But we don't have the amount of sensitive analog devices we used to in the late 80s so much less of a big deal.
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Old 29 May 2020, 10:40   #3
Jope
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The only added benefit of the bottom shield is, that it provides some support to the rear of the motherboard. The ports end will move up and down if you don't have the shield in there, as the motherboard is only supported below the keyboard.

This is really just a perfectionist thing, I've run my regular use A1200 without any shielding for a long time.
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Old 01 June 2020, 16:10   #4
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Quote:
Originally Posted by Jope View Post
The only added benefit of the bottom shield is, that it provides some support to the rear of the motherboard. The ports end will move up and down if you don't have the shield in there, as the motherboard is only supported below the keyboard.
Do you have any recommendations for an easy way to add some support to the rear ports instead of the standard shielding?

Great to hear that it isn't essential, though.
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Old 01 June 2020, 23:52   #5
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Originally Posted by brett71 View Post
Do you have any recommendations for an easy way to add some support to the rear ports instead of the standard shielding?

Great to hear that it isn't essential, though.
I can't believe I never knew about this company until last week - but:

https://centuriontech.eu/product/a1200-io-shield/
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Old 02 June 2020, 07:45   #6
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I'm looking at buying a few of those centurion rear brackets myself, seems like that's just the ticket..
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