Add C65 interface rom @ $C000, and wire $D030 to select it.
Issue #27.
make cs lines for all pieces of C65 ROM.
Make IO map to $0020000-$003FFFF so that we can easily map C65
Make interface ROM 4KB instead of 8KB.
ROMs using MAP instruction.
Issue #27.
update xise file to include interfacec000 rom. Issue #27.