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Assembly language consists of the instructions needed to program the processor, and nothing more. Behind the scenes, high level languages do input and output by calling operating system functions, and the assembly language programmer has to do the same. Exactly how you get the operating system to read a string …
Re: whats .org 100h?
Back in the days of MS-DOS, when a program was loaded into memory a structure called a "program segment prefix" was always prepended to it, and that structure was 100h bytes long. Therefore the actual code began at 100h, and the directive "org 100h" instructs the assembler to assemble code …
The End.