“Cache” means space used for disk caching. It’s free to be used for processes as needed, but the system consumes idle RAM until then to speed things up, so it’s technically not “free”, even though it isn’t used by system processes. In Linux, used - cache gives you the actual consumption by processes.

Jet fuel used in commercial planes does not contain lead. Unless you live around a heavily used general aviation airport, your exposure to lead from airplanes is minuscule.

The latter half of this about aviation fuel went off the rails. Much of it is exaggerated or straight up inaccurate.

First off, lead is used in fuel to protect non-hardened valves used in old engines. It is not just an octane booster, and it’s not some giant conspiracy that’s keeping it in use. Modern engines don’t need it, but people aren’t running it just to be dicks. It’s part of the engine design in really old stuff, which is a ton of old aircraft that haven’t been rebuilt and updated to use unleaded fuel. Converting and certifying these old engines for UL is prohibitively expensive for many hobbyist pilots, but on the whole, leaded avgas has been being phased out for years, and it’s becoming less common every day.

Furthermore, airlines do not use leaded fuel because jet fuel does not contain lead. 100LL (100 octane low lead) avgas is used in small, older piston-engine aircraft, but that accounts for an incredibly tiny fraction of aviation fuel consumption, and there are unleaded avgas formulations available for modern piston engines that can use it. While leaded avgas does contribute to lead pollution, its effect is heavily concentrated around small airports with older private aircraft. Avgas is not a significant contributor to lead exposure for the average person.

Orientation of hot vs neutral

Just for anyone running across this later, another limitation of the EzFJr is that you have to load a custom F/w if you want SGB to work. The Krykzz cart works fine out the box for both platforms. That said, I do own both, and the EzFlash is a great budget alternative for handhelds if you can get it.

I have a X7 and a EzFlash Jr because I want my experience to be seamless and compatible with RTC games, but if you’re really after something for homebrew or don’t mind the added step for anything that supports saves, just get the cheaper one.

No

Not exactly. Some original carts with SRAM would save automatically. You could shut it off and when you turn it on again, your progress would be saved without doing anything manually(eg. Mario Six Golden Coins). In any case, even those games, you still have to do another manual operation on the cart to save the “virtual save”, so the difference is that saving requires an additional, manual step, beyond whatever the game itself requires

If you’re not playing games that save to SRAM, nothing. If you are, then saving just requires you to do it manually, rather than being able to just shut it off and be done, like the original carts would