I'm not sure about the stack overflow compared to my variables, but I'm quite sure I have placed my variables in the correct memory locations provided by this board. I also use ljmp, lcall, cjne, jz, and jnz commands quite extensively throughout my code. I'm quite sure that I have used the proper ret command at each time when it's done with the routine which it jumps to or calls. Could these be causing origins of the problems also?