Top of the PC-9801-26K Sound Board for <a href="https://en.wikipedia.org/wiki/NEC_PC-9801" class="extiw" title="w:NEC PC-9801">NEC PC-9801</a>. (on-board speaker is removed).
<a href="//commons.wikimedia.org/wiki/User:Darklanlan" title="User:Darklanlan">Darklanlan</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>