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It is possible (if tedious) to write direct machine code. Maybe you write the program down in assembler on a piece of paper, and then you translate it by hand into the numeric machine code instructions which you enter into the machine memory. You can even skip the assembler-on-paper step if you have memorized the numeric values of all the machine code ...


A VERY SIMPLE ANSWER Suppose that we write a hardwired program and store it in ROM. It can be considered as compiler. So I simply want to say is that the very first compiler was hardwired. As the technology improved these simple compilers were then used to write high level compilers.

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