Its really a very excellent example of spaghetti code:

http://en.wikipedia.org/wiki/Spaghetti_code


So nobody was able to read it, follow it, understand it and find bugs.


You should rewrite it in such a manner, that small subroutines are used with a RET on its end and a header statement, which declare the parameter passing and the function of the module.

And at first try to do it for only a single switch.

Only then if it works you can expand it for 2 ... 8 switches.


Peter