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The NORD-20 was a smaller, architecturally compatible version of the NORD-10, for use in OEM and process control systems.
According to the 16th Aug 1973 issue of 'Computing Magazine', the NORD-20 was introduced in 1973, but this is incorrect. Oslo Museum has a picture of the NORD-20 which is dated October 1971, and the first machine was probably sold early 1972. ND-Nytt #5, September 1972 , mentions a general programming course for NORD-1 and NORD-20. The NORD-20 Hardware Manual II is also dated 3/3 1972. In other words, NORD-20 was introduced before the NORD-10.