As I mentioned some of this in a thread… an overview of Apple II-family memory expansion methods.
The 6502 has a 16-bit address space, and the base Apple II architecture has 48 kiB of memory mapped from $0000 through $BFFF, I/O in $C000-CFFF, and ROM mapped from $D000-FFFF. Up to this point, everything’s straightforward (there is bankswitching of expansion slot ROM in the $C800-CFFF space, but outside of that…)
Going beyond that…
Apple Language Card (official): 12 kiB of RAM paged in on top of ROM, and another 4 kiB of RAM paged in on top of the bottom of ROM ($D000-DFFF) - two levels of bankswitching
Saturn Systems RAM Board: Up to 128 kiB of RAM, made by adding a third level of bankswitching to the above, so you switch which Language Card is in use.
Luck, patriarchy, but also luck. https://www.vox.com/science-and-health/2018/8/21/17687402/kylie-jenner-luck-human-life-moral-privilege
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