- #BASIC PROGRAMMING LANGUAGE FOR MS DOS FREE DOWNLOAD CODE#
- #BASIC PROGRAMMING LANGUAGE FOR MS DOS FREE DOWNLOAD WINDOWS#
lea dx, hello = lea will load the address of our hello world message into a special register dx and this register is used as a pointer to the data section
#BASIC PROGRAMMING LANGUAGE FOR MS DOS FREE DOWNLOAD CODE#
code = tell the assembler its the beginning of our code data = so here we put constant, global variables etc… main proc is our main procedure like main function in C. stack = is the specifying the stack here we are allocating 100 bytes. model small = this describes the memory model or how the ram is organized so basically there is two types of pointers far pointer and near pointer the near pointer points to data in the current segment its relative to the data segment registers they have size of 16 bits, on the other hand far pointer typically pi= points to another segment read this for more info. So now save the code and now you must first assemble it then link it, which makes it an executable which u can run I will write the code and then explain it line by line. so we need another program in order to generate our final executable which is the linker’s job this image actually explains this concept very well.Īnd we are ready to go and write our program.
#BASIC PROGRAMMING LANGUAGE FOR MS DOS FREE DOWNLOAD WINDOWS#
But there is actually another step needed in order to run your executable why didn’t we assembled the code and everything is fine yes it is but that returns to what actually the assembler produces the assembler don’t produce the final executable it produces a specific type of files called Object Files with extension “.obj” on windows on Linux its. Well so as we said assembly is just a programming language and programming languages in general are tools to talk to a computer without needing to write machine code, but the computer only understands machine code so we need a way to assemble our assembly code into machine code, that’s what an Assembler its main job in life is take your assembly code convert it to machine code that’s it. why its low level well because u mostly dealing with registers, interrupts u are actually dealing with the CPU u are talking to it directly actually there another more low level layer which microcode which is basically a interface between your assembly language / instructions and the hardware. So Assembly is just a programming language but its a very very low level one. Hello World, Today Will Gonna Explain a lovely topic for me which is assembly and specifically dos assembly.