Comment RE: ZX Spectrum radiation (Score 5, Interesting) 64
I have a ZX Spectrum in the loft I often see when I go up there.
As far as RFI is concerned our regulations back then were non-existent.
I once saw a BBC Micro for the German market, it was encased in metal and built like a tank. The ones on the UK market were plastic and caused havoc with my Amateur Radio gear until I quietened it a fair bit by coating the inside of the case with graphite spray and grounding it.
TV's were another problem as they were susceptible to interference from Amateur radio transmissions operating within the legal limits and specifications and we had inspectors who audited our stations for compliance.
It was all down to the manufacturers saving may be a penny or 2 by using a cheaper front-end transistor for TV's sold into the UK.