+; Memory Map 2:
+;
+; Common 18000 .. 1BFFF BANK1
+;
+; Bank 0 00000 .. 0BFFF 0
+; Bank 1 0C000 .. 17FFF 1*BNK_SIZE
+; Bank 2 1C000 .. 27FFF 2*BNK_SIZE + CMN_SIZE
+; Bank 3 28000 .. 33FFF 3*BNK_SIZE + CMN_SIZE
+; Bank n n*BNK_SIZE + (n < 2) ? 0 : CMN_SIZE
+;