" It seems that a limitation of the model 100 is that if you gosub to a subroutine, and then gosub again, it will forget that it is it in a subroutine, and not understand the retrurn statement."
That's not how it works. GOSUB stacks addresses. It means your gosubs and returns are not balanced, which is a bug in your code. Think of a GOSUB as pushing the location of the next BASIC command onto a stack. At some point, you RETURN and it pops that location from the stack and jumps there. If you get a "RETURN without GOSUB" it means you tried to RETURN when the stack was empty! -- John.
