machines, the program runs in a separate 64K bank, and zeropage variables need
to be copied from the system bank into the execution bank to read by a simple
load operation. The change is currently untested!
git-svn-id: svn://svn.cc65.org/cc65/trunk@4597 b7a2c559-68d2-44c3-8de9-860c34a00d81