===Notes===
1. Symbol are (obviously) limited to 255 characters, cannot begin with a number (0-9), and only a limited set of ASCII char is allowed (a-z, A-Z, 0-9, _, .).
2. The map type determines the memory layout for which the symbol is valid. The meaning of the values for map bank and map page depends on the map type value.
Possible values fir map type are: