IBM 7000 series

The IBM 7000 series was IBM's second generation of computers. Instead of the vacuum tubes used in the earlier IBM 700 series for the logic, all the members of the 7000 series used discrete transistors mounted on Standard Modular System cards. Main memory remained the core memory of the earlier machines, but larger and faster.

At this point in time, computers for scientific and business computing were still using separate instruction sets, so there were still two independent lines of models; in addition, a third line, intended as a low-end business-oriented successor to the drum main memory machines (IBM 650. etc), was added:

Scientific	Commercial	Low-end
IBM 7090	IBM 7080	IBM 7070
IBM 7094		IBM 7074

but in general the instruction sets were compatible within each line, and with those of the earlier 700 series machines.