0x17B400 to 0x17C7FF  - Sector-based map attributes table

 This table controls specific sector attributes for
the map areas in EarthBound.  Every 2 bytes controls
the data for an 8x4 tile area (or 'sector') on the map.
This data includes graphics effects, the town map to
use, exit mouse compatibility, Type-58 item usage, and
other such components of the game.

Each entry is made up of two bytes:

Byte 1:
----------------------------------------------------
Byte 1 stores its data in binary, and contains most
of the detailed information in the table.  An easy
way to find the hex equivalent without converting
from binary is to just find the sum of the bit
numbers you want activated.  (I.E. 80, 40, and 08 -
11001000 - would equal 0x80 + 0x40 + 0x8 - 0xC8.)

[80 40 20 10 | 08 04 02 01]

* Bit 0x80 - Teleportation inhibitor.
 [X---|----] PSI Teleport may not be used in this sector
             if this bit is toggled on.
   
* Bit 0x40 - As far as we can tell, this bit is
 [-X--|----] unused.  We believe it may have been
             part of the town map section below.

* Bit 0x20 --\  Controls town map data.   There are 8
* Bit 0x10   |- different possible settings to pick.
* Bit 0x08 --/  
 [--XX|X---]    000 - No Map      100 - Fourside
                001 - Onett       101 - Scaraba
                010 - Twoson      110 - Summers
                011 - Threed      111 - No Map


* Bit 0x04 --\  Controls miscellaneous settings for
* Bit 0x02   |- the map.  There are, again, 8 possible
* Bit 0x01 --/  settings for this data.
 [----|-XXX]
                000 - No special settings
                001 - Area is indoors*
                010 - Exit Mice will function
                011 - Lost Underworld sprites
                100 - Magicant sprites
                101 - Robotomized sprites
                110 - Super-frequent Magic Butterflies
                111 - Super-frequent Magic Butterflies

                *Indoor areas indicate that you appear
                 in your last position on the town map
                 from when you went through a door.

                It is possible - though unknown - that
                setting 111 indicates frequent plus
                the effect of bit 0x01.  More testing
                is required to ascertain this.


Byte 2:
----------------------------------------------------
Byte 2 is an item number.  Items in EB all have a
specific item type number that indicates how they
are used in the game.  Type 58 items are special in
that they can not be used if the player is not in a
specific area.  This byte controls that function.

To allow a player to use a type 58 item in a sector,
you must program the item's number (displayed next
to its name in PK Hack) into Byte 2.  See below for
some examples of how this byte is used (as well as
the other settings in general.)


Examples of default settings:
----------------------------------------------------
00 00 = [0000|0000][00] = Wide variety of places
   - No settings.

00 AF = [0000|0000][AF] = Deep Darkness
   - Item #AF (Hawk Eye) may be used in this area.

00 B0 = [0000|0000][B0] = Peaceful Rest Valley
   - Item #B0 (Bicycle) may be used in this area.

03 00 = [0000|0011][00] = Lost Underworld
   - Lost Underworld sprites are active.

08 B0 = [0000|1000][B0] = Onett
   - Onett shown in Town Map
   - Item #B0 (Bicycle) may be used in this area.

10 B0 = [0001|0000][B0] = Twoson & Happy Happy Village
   - Twoson shown in Town Map
   - Item #B0 (Bicycle) may be used in this area.

18 00 = [0001|1000][00] = Threed
   - Threed shown in Town Map

20 00 = [0010|0000][00] = Fourside
   - Fourside shown in Town Map

28 00 = [0010|1000][00] = Scaraba
   - Scaraba shown in Town Map

30 00 = [0011|0000][00] = Summers
   - Summers shown in Town Map

80 00 = [1000|0000][00] = Ness flashback house
   - Teleport inhibited

81 00 = [1000|0001][00] = Indoor areas, no map
   - Teleport inhibited
   - Indoor area

82 00 = [1000|0010][00] = Caves
   - Teleport inhibited
   - Exit mouse compatible

84 00 = [1000|0100][00] = Magicant
   - Teleport inhibited
   - Magicant sprites

85 00 = [1000|0101][00] = Devil's Machine, Cave in the Past
   - Teleport inhibited
   - Robotomized sprites
   - Indoor area

89 00 = [1000|1001][00] = Indoor areas, Onett
   - Teleport inhibited
   - Onett shown in Town Map
   - Indoor area

8A 00 = [1000|1010][00] = Giant Step caves
   - Teleport inhibited
   - Onett shown in Town Map
   - Exit mouse compatible

91 00 = [1001|0001][00] = Twoson Dept Store
   - Teleport inhibited
   - Twoson shown in Town Map
   - Indoor area

99 00 = [1001|1001][00] = Indoor areas, Threed
   - Teleport inhibited
   - Threed shown in Town Map
   - Indoor area

99 AE = [1001|1001][AE] = Zombie Relief Corps tent
   - Teleport inhibited
   - Threed shown in Town Map
   - Indoor area
   - Item #AE (Zombie Paper) may be used in this area.

9A 00 = [1001|1010][00] = Underground Road caves
   - Teleport inhibited
   - Threed shown in Town Map
   - Exit mouse compatible

A1 00 = [1010|0001][00] = Indoor areas, Fourside
   - Teleport inhibited
   - Fourside shown in Town Map
   - Indoor area

A2 00 = [1010|0010][00] = Fourside sewers
   - Teleport inhibited
   - Fourside shown in Town Map
   - Exit mouse compatible

A9 00 = [1010|1001][00] = Scarabian indoor areas
   - Teleport inhibited
   - Scaraba shown in Town Map
   - Indoor area

B1 00 = [1011|0001][00] = Indoor areas, Summers
   - Teleport inhibited
   - Summers shown in Town Map
   - Indoor area