Addition!

As you can see from this screen shot, addition now works. In fact, I now have a CMRreadexpression routine that reads an expression, parses it and executes it. It can differentiate between variable names and numbers, as well as handle the + symbol. It can be easily extended to handle other operations as well, though parentheses will be another hurdle, if I am going to implement those at all. Making it a separate function will make it very easy to include it in the next challenge, the FOR instruction. So hopefully I will be able to say things like:

FOR a%=b%+1 TO 0 STEP -1
...
NEXT a%

In the screen shot you can see additional debug statements that identify the operator ('+') but this will be removed soon, probably. Despite what the screen shot seems to imply, the print bug of virtual semicolons has not been fixed: I just added a few spaces to the end of the line.