That PC is probably the venerable IBM 5150. Remember that this machine had a 4.77 MHz clock for the 8088 processor. There was a lot of metal in these things, and the case provided a reasonable amount of shielding. Even the keyboard was in a metal case. The computer was mostly built around TTL logic with very slow edge transitions on the signals. The computer costs almost half the price of a new car, and IBM was able to put in the money necessary to make it a high-quality and compliant machine. If you gave me the resources IBM had at the time, and that level of technology, I could make a similar computer that would easily be golden. On the other hand, it would have about the same processing capabilities of a modern cheap pocket calculator.
Ted Eckert Compliance Engineer Microsoft Corporation [email protected] The opinions expressed are my own and do not necessarily reflect those of my employer. From: Bill Owsley [mailto:[email protected]] Sent: Friday, May 08, 2009 8:01 PM To: [email protected] Subject: Re: ANSI C63.4/CISPR 22 Testing Configuration I don't recall if any of that stuff was available in 1980-82. ps. The first IBM "Golden" PC approved by the FCC is sitting under plexiglas in the EMC lab at IBM in RTP, NC. (if still there) 16k RAM, 2 each 5.25" 160K? floppy drives, peripherals not included. Tested to MP3? so long ago... - Bill Indecision may or may not be the problem. --- On Fri, 5/8/09, Ted Eckert <[email protected]> wrote: From: Ted Eckert <[email protected]> Subject: RE: ANSI C63.4/CISPR 22 Testing Configuration To: "Brent G DeWitt" <[email protected]>, "[email protected]" <[email protected]> Date: Friday, May 8, 2009, 8:09 PM We also use K’nex toys <http://en.wikipedia.org/wiki/K'NEX> . Both Lego and K’nex have motorized versions. You have to put up with the motor’s broadband noise, but it is easier than getting pneumatics into the test site. Ted Eckert Compliance Engineer Microsoft Corporation [email protected] The opinions expressed are my own and do not necessarily reflect those of my employer. From: Brent G DeWitt [mailto:[email protected]] Sent: Friday, May 08, 2009 4:58 PM To: [email protected] Subject: Re: ANSI C63.4/CISPR 22 Testing Configuration The folks at Microsoft in Redmond made a wonderful little Lego creation to keep their mouse moving for both emissions and immunity testing. It worked out quite well. Brent DeWitt Framingham, MA From: Bill Owsley [mailto:[email protected]] Sent: Friday, May 08, 2009 12:52 PM To: [email protected] Subject: Re: [PSES] ANSI C63.4/CISPR 22 Testing Configuration We tested a mouse when they first came out by tying the lease (cable) to a stick braced between the legs of the table and dragging the little begger around the outside of the turntable. The spectrum was spectacular! After those first results, you'll notice the standards don't address any efforts for causing the mouse or keyboard to be 'operated' during testing. Even today, you'll find the mouse in the FCC under, 15.103 Exempted devices, along with others. - Bill Indecision may or may not be the problem. --- On Thu, 5/7/09, John M Woodgate <[email protected]> wrote: From: John M Woodgate <[email protected]> Subject: Re: [PSES] ANSI C63.4/CISPR 22 Testing Configuration To: "Dan Roman" <[email protected]> Cc: "[email protected]" <[email protected]>, "[email protected]" <[email protected]> Date: Thursday, May 7, 2009, 5:10 PM In message <[email protected] <http://us.mc01g.mail.yahoo.com/mc/compose?to=54fa6a0de969bb4b88c667e400ba85d404f699a...@mbx.dialogic.com> >, Dan Roman <[email protected] <http://us.mc01g.mail.yahoo.com/mc/[email protected]> > writes > Maybe there is an IEC committee with nothing better to do than write a mouse > standard? Don't give people dangerous ideas! This thread, or one very like it, originated with the idea of producing an 'EMC reference (probably portable) PC', which would be a piece of test equipment, at a 'test equipment' price, intended to take out the uncertainty that if you test your peripheral (mouse or whatever) with 'PC model XYZ', some zealous enforcer may claim that you should have used a different one. Now, I think that the 'reference PC' is a very good idea, but the thread went off into orbit, as they often do, and the original theme was lost. So I wish some PC maker might seriously consider making such a 'reference PC', because not only would it reduce anxiety in the EMC community but at an acceptable price, it could offer a good margin. -- This is my travelling signature, adding no superfluous mass. John M Woodgate - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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