bugzmanov.github.io/nes_ebook/chapter_4.html
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2 KiB of ram space
address space being mapped to another address space
read or write access
address of a required location
byte of data being read or written
don't need to implement it as an independent module
not a device
Bus module
Data reads/writes
Routing hardware interrupts to CPU
Handling memory mappings
Coordinating PPU and CPU clock cycles
only 11 bits is enough for addressing RAM space
only 11 addressing tracks from CPU to RAM
2 highest bits have no effect when accessing RAM
111_1111_1111
111_1111_1111
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