Macintosh II motherboard. Motorola 68020 CPU and 68881 FPU at the bottom.  On the right, eight SIMM slots and on the left six Nubus slots.
J-P Kärnä
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>  (From <a href="https://en.wikipedia.org/wiki/Image:Macintosh_II_motherboard.jpg" class="extiw" title="en:Image:Macintosh II motherboard.jpg">en.wikipedia</a>.)