Nintendo: lots o' metal... for shielding?

Decided to take apart my old Nintendo (from ~ 1987) to try and clean
the contacts, and see if it would work. (Often, if you put in a ROM
cartridge, the game wouldn't work. I heard on the net that it's
because the contacts tended to corrode.)

So, I took it apart, took out the black contacting mechanism, and
rinsed it with 409. Dried it, and it seems to work better now.
(Haven't played Zelda in maybe a decade!)

I noticed, though, that there was *a lot* of metal covering the
electronics guts of the Nintendo. (Almost cut myself with all that
metal.) Is this to avoid broadcasting interference, or to avoid
receiving that "interference that could cause undesirable operation" as
per FCC rule Part 15?

Michael

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