| http://www.w3.org/ns/prov#value | - Initially these were controlled using the front-panel test switches, with four switches for each player, but these proved to wear out very quickly under normal gameplay, and the location of the switches left one player off to one side of the CRT display and visually disadvantaged as a result.[3] Most sites used custom control boxes wired into the same switches, although joysticks and other inputs
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