With great interest, I have seen that there are now scans for the Z23 (perhaps more coming soon :-) ). But I have to admit that I am so much disappointed of the quality. I mean, whoever scanned this all, did he have a single look at the output? I do this, for each of the many scans, may they be only a single or many hundred pages. Example: .../zuse/Z23/Zuse_Z23_Beschreibung_einschlie%c3%9flich_der_Zusazgeräte_Februar_1962.pdf PDF pages 16/17: this is a no-go. This must not happen in a document uploaded to bitsavers. Pages 32-35 (and many others, too): what the heck happened here?? And there appears to have been some "intelligent" post-processing of the images that renders them very artificially. Sorry for the rant, but that is not what I would accept as archiving material. I'd offer to rescan them (guessing that the origin is from Germany) reasonably. Christian