The fact that the Apple II met the new FCC requirements was a major competitive advantage for Apple, and there have been rumors over the years about how that happened. The higher emissions allowance was why you saw the big shift from monsters like the Atari 800 (heavy cast metal frame, aluminum or pot metal) and Commodore PET to lighter chassis like the Atari XL series and the Commodore VIC-20 and C64.
The old FCC Standards kneecapped Atari. I think Atari would have had a much showing against Apple had they not had to have the heavy and expensive cast box inside every 400/800 and the increased cost for "smart" peripherals versus "dumb" slots. Those Atari machines are arguably more technically advanced and capable than the Apple II. The cost of FCC compliance drove up the price and hurt their market share.
I've always thought the whole Apple / aftermarket RF modulator trick was a bit underhanded.
When I was a kid, I had a green screen Apple, and I wish I knew about 3rd party RF modulators. (It didn't work with an Atari-style modulator.) I never saw a setup like that, so I wonder how common they really were.
It was the typical way to connect a TV to an Apple. I used one before I bought a monitor.
Except that after the initial model, the PET's case was plastic, or rather, structural foam, with no shielding applied to it all.
After the initial 2001 model, Commodore used a mix of materials, with some models made of all metal and some of a metal/plastic hybrid (metal base, plastic top), according to this website: https://www.zimmers.net/cbmpics/cbm/PETx/petfaq.html (look for "WHAT MODELS OF THE PET ARE THERE?")
Source? Every Commodore PET I've ever come across had a metal chassis. Commodore64s and VICs had plastic ones.
Interesting. I didn't know that.
The UK did not have emissions regulations at the time, and the most popular computer of the early 80s in the UK, the Acorn BBC Micro, had no shielding whatsoever.
Acorn wanted to break into the US market, and so they had to redesign the computer with a massive metal box inside the outer plastic case.
Their attempt to launch in the US was a huge failure, and most of those computers were shipped back to the UK and "unconverted" to be resold in their home market.
But they didn't remove the metal box. So Brits could always tell when they had an ex-US BBC Micro because it weighed twice as much and had a huge metal box inside it.
Seems strange no one came up with spraying the inside of the case with a metallic shielding layer of paint, as some later products eventually did.
Author of the OP here. The "spray" technique was known in the early 80s, if not earlier. It's mentioned in Michael Tomczyk's "Home Computer Wars":
> The solution came in several forms. One way was to embed ferrite balls in the plastic case. Another way was to spray the inside of the case with a metal coating. But the best way was to encase the offending electronics in a small metal box inside the case, which is what was done with the VIC-20. [0]
Why a metal box is the best way, he doesn't say and I don't know. My best guess is that it was more effective/reliable at passing the tests.
[0]: https://archive.org/details/the-home-computer-wars/page/205/...
> The 1983 FCC-compliant Apple IIe. Unused slots have metal covers for RF shielding.
Interesting--I always assumed the metal covers (particularly on the old IBMs) were to keep out dust.
And I'm reading this article while sitting at an EMC/EMI test facility monitoring the test for one of my products. Certainly an interesting, and somewhat on-topic, read.
I had an Atari 400 as the first computer I bought myself, which I upgraded to a “real” (if small) keyboard that replaced the membrane keyboard. I took it to college and used it with a printer and the Action! cartridge editor to write papers. (My printer was a carbon electrode arc printer that burned marks into regular paper, producing a soft brownish print.)
> By June 1979, Atari had sold over one million VCS consoles.
Speaking of an even weirder hybrid before the hybrids... By 1979 Atari released a BASIC cartridge for the Atari VCS (later renamed Atari 2600): the VCS/2600 was a console. No keyboard. So the BASIC cartridge shipped with the most horrible keyboard ever invented.
So in a way the console themselves were the first hybrid.
Believe, I know: it's how I wrote my very first program ever. It was super simple: basically modifying programs drawing colored lines across the screen.
IIRC -- but I was a kid back then and now I'm nearly the mid 50s -- that BASIC cartdridge's keyboard required to be plugged in both joystick ports.
Oh. The. (128 bytes of RAM) Memories.
usb mouse discovered
Joe DeCur, primary architect of the Atari SIO bus, was involved in the design of USB. Some of his Atari-era notebooks helped kill a patent troll who was trying to extract rents from everybody using USB.