Also for the purposes of OS development I have implemented ORG directive behaving a bit differently than the original one in TASM. What I needed was setting the origin address of given code, but without actually moving the output point in file. I though it should be programmer's responsibility to load the code at the origin he specified, like DOS does it with the .COM programs - this is again important in OS kernel development, where you may have many different pieces of code that will be put in many different places and can be addressed in many different ways. The ORG directive in my version allows to design code to work correctly when loaded at specified origin, while its placement in file is just determined by the order of source. My assembler, generating the code in flat addressing space, was always outputting the code exactly in the same order, as it was defined in source. Thus came the name for it - flat assembler.