Assembler, Linker and Debugger

We need an assembler to assemble this program and convert this into executable binary code. The assembler that we will use during this course is “Netwide Assembler” or NASM. It is a free and open source assembler. And the tool that will be most used will be the debugger. We will use a free debugger called “A fullscreen debugger” or AFD. These are the whole set of weapons an assembly language programmer needs for any task whatsoever at hand.

To assemble we will give the following command to the processor assuming that our input file is named EX01.ASM.

nasm ex01.asm –o ex01.com –l ex01.lst

This will produce two files EX01.COM that is our executable file and EX01.LST that is a special listing file that we will explore now. The listing file produced for our example above is shown below with comments removed for neatness.

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