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backed RAM, related to
#7

Related to #7

# Conflicts:
#	CHANGELOG.md
#	Cargo.toml
#	examples/sdl/Cargo.toml
#	examples/web/index.ts
#	examples/web/package.json
#	examples/web/react/components/keyboard-chip8/keyboard-chip8.tsx
#	examples/web/react/components/keyboard-gb/keyboard-gb.tsx