* Happy Computer Schneider Sonderheft 7 - Memory Expansion for 464/664/6128
* Happy Computer Schneider Sonderheft 8 - Happy Computer Super EPROM Burner
Other DIYs from Happy Computer (which might have been released in normal editions, not in the special Sonderheft editions:
* [[Happy Computer Light Pen]] - unknown in which issue it occurred
[[Category:CPC Press]] [[Category:Magazines]]