The <b>motherboard</b> of the <b><a href="https://en.wikipedia.org/wiki/Z1013" class="extiw" title="en:Z1013">Robotron Z1013</a></b>, a self-construction single-board computer and home computer which was manufactured in the GDR (East Germany) by the <a href="https://en.wikipedia.org/wiki/Robotron" class="extiw" title="en:Robotron">VEB Robotron</a>-Elektronik Riesa. First introduced in 1984. This is the version <b>Z1013.64</b> with 64 kB RAM.
Z1013-Rene (doesn't want to announce his real name)
Attribution
The author sent the photo to me.