First real-time digital computer. First magnetic-core memory (remained the dominant form of computer memory until 1973). First digital phone-line transmission and modems, first interactive graphical interface, first light pen, first computer keyboard, first duplexed computers. First real-time software, which evolved into assemblers, compilers, and interpreters. First software diagnosis programs, first time-shared operating systems, first structured program modules, first table-driven software, and first data description techniques.