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A1200 - interior
A1200 - interior
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Description: The RF shield is still on, but you can see the accelerator (with 8Mb of RAM), the drives, the kickstart chips and where the keyboard connects.
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Posted by: alx at October 12, 2003, 03:44:03 PM

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Comments (4)

rkauer
Posts:3263
January 17, 2008, 09:57:58 PM
Quote

Oliver has posted:
--zip--
The shielding reduces the radiation seen by the amiga from external sources, it also reduces the radiation to external sources from the amiga.

 For the Amiga's own radiation, it will actually be partially reflected by the shielding on top.

 There's no shielding underneath, right? Can't remember now.


 Yes, the board have an underneath shield.!
Oliver
Posts:803
April 20, 2006, 02:46:06 PM
I'm pretty sure it would not reduce the noise seen by the Amiga chips, unless you have much other noisy equipment nearby.  The shielding reduces the radiation seen by the amiga from external sources, it also reduces the radiation to external sources from the amiga.  For the Amiga's own radiation, it will actually be partially reflected by the shielding on top.  There's no shielding undernieth, right?  Can't rememer now.

This design may well not pass current emc standards, particularly if you have a PPC accellerator running at a few hundred MHz (basically unshielded).  Still, it's only moderate  frequencies & low currents, so not a big deal.
alx
Posts:1023
December 10, 2003, 10:35:47 PM
Quote
Reduce electrical noise in paula maybe?


I can assure you that she's noisy enough as it is :-D

BTW if anyone recognises this particular setup, I bought it off a member this summer (my first miggy :-o )
Karlos
Posts:16832
December 10, 2003, 12:11:08 AM
That old top sheilding is a rare sight these days. I often wondered if theres any reason to put it inside a towered system? Reduce electrical noise in paula maybe?

My 1200D still has the sheilding in, thankfully my old seagate is very slim :-)


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