Data General Nova 1220

Further improvements in the line followed in 1970/1 with a pair of machines that replaced the Nova/SuperNOVA, the Nova 1200 and Nova 800 series. The 1200 used 1200 ns core while the 800 featured the SuperNOVA’s 800 ns core, explaining the somewhat confusing naming where the lower number represents the faster machine. Like the earlier models, the 1200 used a 4-bit math unit while the 800 used the SuperNOVA’s 16-bit unit. Both models were offered in a variety of cases, the 1200 with seven slots, the 1210 with four and the 1220 with fourteen. The 840, first offered in 1973, also included a new paged memory system allowing for addresses of up to 17-bits. An index offset the base address into the larger 128 kWord memory. Actually installing this much memory required considerable space; the 840 shipped in a large 14-slot case.