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In 1941, Konrad Zuse built a programmable electromechanical computer, called the Z3 machine, that understood binary encoding and floating point numbers.


Cover of Learning Computer Architecture with Raspberry Pi


The Atanasoff–Berry computer (ABC) was the first automatic electronic digital computer ... the key principles of the ABC were conceived of in 1937. A working prototype was demo'd in October 1939 and was the first to implement three critical ideas that are still part of every modern computer: binary digits, electronic calculations, separation of computation and memory. The ABC played an important role in history; it was not a toy or academic curiosity -- it was designed to solve urgent PRACTICAL problems in statistical research and computations in physics that involve solving large systems of simultaneous equations.

Other milestones should be recognized... https://en.wikipedia.org/wiki/List_of_IEEE_milestones