 The Spectra series was later supplemented by the RCA Series (RCA 2, 3, 6, 7— later renamed the 70/2, 70/3, 70/6, and 70/7, which competed against the IBM System/370.The RCA 2 and 6 ran the real-memory batch-oriented OS/70 operating system, while the RCA 3 and 7 ran VMOS.Some English Electric System 4 mainframes were rebadged Spectra 70 machines; others were English Electric-designed clones of the RCA Spectra 70 clones of the IBM System/360 range.