bugfix ROM/RAM size
add ADDA extended, CMPX extended and JSR extended
Display more mem info

Use information from:
 * http://dragon32.info/info/memmap.html - Dragon 32/64 Memory Map (with
CoCo refs)
 * http://dragon32.info/info/romref.html - Dragon 32/64 ROM Reference
guide
from author: Graham E. Kinns