Discuss about the Electronic computer 
The first general function programmable electronic computer was the Electronic Numerical Integrator and Computer (ENIAC), built by John V and J. Presper Eckert.
The trends that were encountered during era of first generation computer were as:
-  All control of First generation computer was centralized in single CPU and all operations required a direct intervention of CPU.
-  Ferrite-core main memory use was started during that time.
-  Ideas such as use of index register and virtual memory. 
-  Input device were punched cards.
-  Magnetic drums and magnetic tapes were used as secondary memory.
-  Machine language or Binary code was used for programming.
-  Towards end due to difficulties encountered in use of machine language as programming language, use of symbolic language that is now called as assembly language started.
-  Assembler was a program, that translates assembly language programs to machine language, was made.
-  Computer was accessible to only a single programmer at a time (single user environment).
-  Advent of Von-Neumann Architecture.