ram.asm - 89erik/NES-breakout GitHub Wiki
This file holds pointers to RAM. The contents of this file will occupy addresses from the ZERO_PAGE segment as explained in root/main.asm. All labels in this file will thus point to the first page of RAM. No code or constants can exist here compile time, as data can only exist on the game cartridge (PRG-ROM or CHR-ROM).
tl;dr this file contains variable pointers.