Ask iFixit: Does Blowing Into Gaming Cartridges Actually Fix Them?
ifixit.com
ifixit.com
It was like muscle memory for them. They'd encounter a glitch, yank the cartridge out, blow on it, and then thrust it back in and hope that it'd be better for the next hurried speedrun. Rituals were had of blowing nto games before even playing them the first time, so as to ward off the glitch demons pre-emptively.
We never did this in our family. When we started encountering glitches, our dad called Nintendo to ask about the problems we were having with the [rather expensive] system he'd bought. They sent a kit for cleaning cartridges, which included a wide, flat absorbant swab wrapped with some kind of seemingly-synthetic absorbent material and a little drippy bottle full of isopropyl alcohol.
This actually worked. (IIRC, during that phone call they also issued interim instructions for using a Q-tip and isopropyl to get things moving while the package was shipped.)
We didn't have anywhere near the problems with glitches that our friends did. Mostly, the games just worked with some occsasional cleaning and time to dry out.
One common cause for NES glitches is for the 72-pin connector to get bent out of shape. You can find replacements on eBay, and it makes a world of difference. Surprisingly, it’s also good advice not to push the cart down once it’s inserted, as that increases pressure on the pins and bends them more over time (despite the slot allegedly being zero insertion force).
A friend brings me his crashy scratch-built computer. I take the lid off, use a pencil eraser on the DIMMs, and reassemble it. It's fine after that, minus a couple of atoms or so of gold plating thickness.
As long as it's a good pencil eraser, anyway -- some leave a smeary mess.
25 years or so ago, I was reading that the cart socket on the Nintendo used repurposed regular card-edge parts; parts that were never meant to work at multiple angles. I don't know the validity of this, since I haven't yet restored either of the two NESs that I have here (both of which I should have sold -- even broken and dirty -- during the NES Mini craze).
I've thus never had a good, stern look at that socket.
(But back in the 1980s, between us young kids and our electronics-luddite dad and a phone call to Nintendo, isopropyl was the answer.)
Moreso bad and unspoken being the lingering terrible stench of shared breath and dried spittle in cartridges passed around schools, apartment buildings, and housing projects. Glad COVID didn't start back in '84, shit would've been like 12 Monkeys.
In comparison, the modern "turn it off and turn it back on" just don't have the right tactile feel to it. Except maybe when power cycle doesn't work and you have to pull the battery.
I can't think of any game that involves removing or inserting a cartridge while the console is on.
When I put the cartridge back in, the screen was blank apart from a message simply saying something like ‘The save file is corrupted. A new save file must be created.’.
I was devastated. 200 hours and what felt like a life’s journey. And it was all gone.