This is a hardware service manual for the magnetic tape controller used in the Nixdorf DSS 620 computer manufactured from 1974 to 1984. This product range was based on the US Entrex key-to-disk systems licenced for manufacture in Germany.

Published in December 1974. 

Includes printed circuit board layouts, logic diagrams and interwiring.

It is in good used condition and is a large (A4) format document, on heavy duty paper with the pages already perforated for insertion into a 4-ring binder. Larger drawings are on foldout A3 sheets

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