Call Another Source File

I'm building a program(in 16-Bits) using Assembly(nasm as the assembler), but as I love to开发者_开发知识库 have things organized in different source files. Let's think I have 2 sources, one called main.asm and another one called source2.asm, but I want to call the source1.asm content in the middle of main.asm. How could I do this?

Use the %include directive. See nasm manual section 4.5

Use GLOBAL and EXTERN.