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    I voted to close this question as Too Broad. While I admire your desire to learn, you're doing it in the hardest possible way: by asking a series of questions directed at random people on the Internet. The easier and faster way to learn what you want to learn is to pick up a good book, take a class or watch a video, and then write some code. Commented Jun 3, 2016 at 16:14
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    You seem to be coming at this from the wrong direction. If you want to understand this, you should probably start by understanding what machine code is. Commented Jun 3, 2016 at 16:56
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    you write a program that reads lines of text from a file. when it sees the text LDA, by look for an L then a D and then an A with no white space between but possibly on other sides then it outputs 0x3A in some format. Elementary programming problem, how do you read a file full of numbers and say graph them or average them or whatever? no different. read a file convert the data into some other format. Commented Jun 3, 2016 at 17:35
  • I rejected the close reason and marked it as duplicate to a similar question. I then reopened the duplicate. Hopefully this gives you the answer you need. Commented Jun 4, 2016 at 2:06
  • It looks it up in a big list of opcodes that the people who made the assembler typed in. Commented Nov 20, 2018 at 3:01