The Jumper Pak for the Nintendo 64 video gaming console.  Located under a small hatch on the top of the N64 system, this Jumper Pak was installed in all N64 consoles.  It merely served as a placeholder for the optional 4MB Expansion Pak.
<a href="//commons.wikimedia.org/wiki/User:Evan-Amos" title="User:Evan-Amos">Evan-Amos</a>
<span class="int-own-work" lang="en">Own work</span>