Video game accessories include controllers, memory units, audio/video cables, cases, and software. Controllers have evolved from simple directional controls to include analog sticks and motion controls. Memory units store saved game data and began as memory cards before consoles incorporated internal hard drives. Audio/video cables transmit video and audio signals from consoles to TVs and have progressed from RF to composite cables to HDMI. Cases protect consoles and games. Software accessories include both licensed games and homemade content through modchips or alternate operating systems.