He was the seller of these 2 auctions. (And I was the buyer, of course...)
Nixdorf DSS 620 Computer Service Manual - Entrex Key-to-Disc
Nixdorf DSS 620 Service Manual 1600 BPI Tape Controller - Entrex Key-to-Disc
Meanwhile, these manuals have arrived, and DSS 620 "Main" Service Manual is by far the most interesting and helpful. Here's the table of contents:
And, since you've chosen to read this far, here's your reward!
You may download full PDFs of each of these schematic books, courtesy of me.
So rarely do I have a chance to give back to the Vintage Computing Restoration community, and I hope that this is one of my opportunities to do so. So, here they are...
WARNING: This pdf is 243Mb in size, in order not to choke your browser, you may choose to right-click the link and choose "download", rather than just click the link directly...you've been warned...
Nixdorf Service-Manual DSS 620 Schematic Book
SUPPLEMENTARY Nixdorf Service-Manual DSS 620 Schematics
And, for a slightly different format of exactly the same things,
hyperlinked to the highest resolution download for each schematic.
But some guidelines about downloading may be in order...
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