The K 1840, full name RVS K 1840 (Rechnersystem mit virtuellem Speicher, "computer system with virtual memory") is a minicomputer from the German Democratic Republic (GDR).
The export of western 32-bit minicomputers to Comecon countries was forbidden by the CoCom technology embargo.
In 1988 it was awarded the National Prize of the GDR, 1st class, and a gold medal at the Leipzig spring fair.
It has a larger main storage capacity (up to 64 MiB) and can handle more bus adaptors and controllers than its predecessor.
In mid-1990, production of the K 1840 and K 1845 and all development work stopped, because economical production was not feasible under free-market conditions resulting from the currency, economic and social union of East and West Germany on 1 July 1990, causing the collapse of Robotron's traditional markets in the Soviet Union and East Europe.