24 Sep
2009
24 Sep
'09
1:07 p.m.
Brian writes:
http://cgi.ebay.com/Vintage-IBM-Personal-Computer-AT-Model-5170-System_W0QQ…
It looks like a 5170 case wrapped in even more metal.
Sometimes this is for tempest compliance although I would think that if a 5170 was to be
made tempest compliant, you'd need some kind of baffle over the front. And the tempest
people were always real big on putting CRT's in metal cans too.
Tim.
24 Sep
24 Sep
1:17 p.m.
On Sep 24, 2009, at 1:07 PM, Shoppa, Tim wrote:
Weren't the insides of those plastic front pieces coated with that
gray or dark red spray-on anti-EMI stuff?
-Dave
--
Dave McGuire
Port Charlotte, FL
http://cgi.ebay.com/Vintage-IBM-Personal-Computer-AT-Model-5170-
System_W0QQitemZ250503424592QQcmdZViewItemQQptZLH_DefaultDomain_0?
hash=item3a532aea50&_trksid=p3286.c0.m14
It looks like a 5170 case wrapped in even more metal.
Sometimes this is for tempest compliance although I would think
that if a 5170 was to be made tempest compliant, you'd need some
kind of baffle over the front. And the tempest people were always
real big on putting CRT's in metal cans too. 
1:45 p.m.
On 24 Sep 2009 at 13:17, Dave McGuire wrote:
Weren't the insides of those plastic front
pieces coated with that
gray or dark red spray-on anti-EMI stuff?
Could be, but that was to meet FCC section 15, subpart B
requirements. The metallic paints (some was just zinc) were not
qualified for Tempest. The big hole I see is where the disk drives
are visible. That would never be Tempest-rated.
--Chuck
2:17 p.m.
On Sep 24, 2009, at 1:45 PM, Chuck Guzis wrote:
Ahh, good point!
-Dave
--
Dave McGuire
Port Charlotte, FL
Weren't
the insides of those plastic front pieces coated with that
gray or dark red spray-on anti-EMI stuff?
Could be, but that was to meet FCC section 15, subpart B
requirements. The metallic paints (some was just zinc) were not
qualified for Tempest. The big hole I see is where the disk drives
are visible. That would never be Tempest-rated.
5365
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