Dynamic Interrupt Routine

[boriel]

In my implementation, in every interrupt I read the $c000 page, switch to the music page (for example), run music, and then switch to the original page before return.

I thing it's important for Next developments where $c000 memory area are used for several resources, at leat in my implementation.

I'm working on a more generic implementation now that ZX Basic 2.x is on the way! Stay tuned!