Changes
/* 1M-4M Expansions (extended standard) */
* '''Compatibility''' - The first 512K (Port 7Fxxh) are fully compatible with dk'tronics. Using the next 1.5MB (Port 7Exxh,7Dxxh,7Cxxh) should work without conflicting with the other hardware expansions.
* '''Compatibility Problems''' - The last 2MB (Port 7Bxxh,7Axxh,79xxh,78xxh) can conflict with other hardware. As workaround: Either leave them unused, or use values for "xx" that do not conflict with your hardware (which values are good for "xx" and which aren't good depends on what other hardware you have connected) (and obviously, different "xx" may be needed in 7Bxxh as in 7Axxh, for example).
== Capacity ==
