Each mnemonic symbol transforms to a unique hex code or binary code i/p to the target processor designed to perform a specific function ex: ALU(Arithmetic logic unit of processor has a binary i/p to perform ADD instruction). Assembler does the job of converting these mnemonics into Hex code. For ex: Mov generates an opcode to perform an operation to move a value from one location to another. To read more on mnemonics look at 8085 and 8086 architectures and write some assembly code.
You need to convert these mnemonics into Hex code while entering your program in 8085 microprocessor kits. If you do handcoding atleast once you will know what a computer is and how it works just on 1's and 0's.
http://scitec.uwichill.edu.bb/cmp/online/el21c/lesson18.html
http://www.daniweb.com/techtalkforums/thread31178.html

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