It is an undeniable fact that integrated development environments (IDE) become more and more popular, so why did we choose not to do so? The answer is in fact simple. First of all, the feature that the system developed should be fully C portable was vital. Just the fact that an IDE would require a build in editor would mean a necessity for a graphics or screen kernel which of course would be system dependent. Secondly, our task was to build a professional compiler for heavy work and not a toy environment for novice training. Furthermore a good IDE would be large in code size, and therefore, it might have caused problems on small memory systems.