Ultima V Internal Formats

This text is from Nodling's information. It is only a copy paste, as I go, I'll be reformating it and then adding information.

= LZW compressed =

Some files from the PC version of Ultima 5 have been compressed with the LZW algorithm: (and possibly others)
 * .4
 * .16

*.4
These files are LZW-compressed. The uncompressed files contain 4-color images. They have the same format as the *.16 files, except that each pixel has 2 bits.

*.16
These files are LZW-compressed. The uncompressed files contain 16-color images.

TILES.16
This file contains 0x200 tiles. The tile format is 16x16 pixels and there are 4 bits per pixel. The generic structure is:

struct Tiles_16 { Tile tiles[0x200]; }

struct Tile { Tile_Row rows[16]; }

struct Tile_Row { uint8 pixel_data[8]; // 4 bits per pixel }

Tileset
The .16 Tile set is :



TILES.4
This file is exactly the same structure as the TILES.16 one, except that Tile_Row is actually:

struct Tile_Row { uint8 pixel_data[4]; // 2 bits per pixel }

Tileset
Here is the tileset using a gray-scale scheme with this file:



ITEMS.16 and MON*.16
file = number_of_entries, set of offset16, set of masked_image

number_of_entries = uint16 offset16 = uint16 masked_image = image, mask

image = width, height, set of pixel4 mask = width, height, set of pixel1

width = uint16 height = uint16 pixel4 = uint8 (4 bits per pixel) pixel1 = uint8 (1 bit per pixel)

All other *.16 files
file = number_of_entries, set of offset32, set of image

number_of_entries = uint16 offset32 = uint32 image = width, height, set of pixel4

width = uint16 height = uint16 pixel4 = uint8 (4 bits per pixel)

Notes:

1) The end of each row is padded with 0-7 black pixels (value = 0), to make sure that bytes_per_row % 4 == 0.

The width does not include the padding.

2) In DNG*.16, offsets 0x8 and 0x18 are zero.

= *.CBT =

Combat maps (11x11 tiles).

File format: struct CBT_File { Combat_Map c_maps[n]; }; struct Combat_Map { Map_Row             row0[1]; // row 1 = east // row 2 = west // row 3 = south // row 4 = north Map_PlayerPos_Row   row1_4[4]; Map_MonsterTile_Row row5[1]; Map_MonsterX_Row    row6[1]; Map_MonsterY_Row    row7[1]; Map_Row             row8_10[3]; }; struct Map_Row { uint8 tiles[11]; const uint8 zeroes[21] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; }; struct Map_PlayerPos_Row { uint8 tiles[11]; uint8 initial_X[6]; // initial x position of each party member uint8 initial_Y[6]; // initial y position of each party member uint8 zeroes[9] = {0,0,0,0,0,0,0,0,0}; }; struct Map_MonsterTile_Row { uint8 tiles[11]; uint8 monster_tiles[16]; // tile for each monster uint8 zeroes[5] = {0,0,0,0,0}; }; struct Map_MonsterX_Row { uint8 tiles[11]; uint8 initial_X[16]; // initial x position of each monster uint8 zeroes[5] = {0,0,0,0,0}; }; struct Map_MonsterY_Row { uint8 tiles[11]; uint8 initial_Y[16]; // initial y position of each monster uint8 zeroes[5] = {0,0,0,0,0}; };

Notes:

- The initial party member positions dependd on the direction from which the party entered the map.

= *.CH =

Font files with 128 characters each: - ibm.ch contains the Latin characters and a number of symbols. - runes.ch contains the Britannian runes and the remaining symbols.

File format:

Each character is 8x8 pixels, 1 bit per pixel (0 = black, 1 = white). I don't know which palette index is associated with a 0 or 1. Each byte represents 8 pixels. The most significant bit represents the leftmost pixel, and the least significant bit represents the rightmost pixel.

= *.DAT =

BRIT.DAT
The Britannian map. Its size is 256x256 tiles. It is divided into 256 chunks. Each chunk has a size of 16x16 tiles, and each tile is stored as a uint8 (in Ultima 4, the chunk size was 32x32 tiles).

To save space, chunks that are all water (tile 0x1) were left out. The location of the all-water chunks is stored in DATA.OVL. The chunks are stored from west to east, north to south, i.e. the first chunk in the uncompressed map is the one in the northwest corner.

The tiles in a chunk are also stored from west to east, north to south.

The complete map of Britannia is: 

LOOK2.DAT
This file contains the "look" descriptions for the 0x200 tiles. Each description is a zero-terminated ASCII string. Some descriptions consist only of an asterisk, which the game displays as a diamond. The offsets are relative to the beginning of the file.

look2.dat = set(0x200) of offset16, set(0x200) of ascii_string

offset16 = uint16 ascii_string = set of ascii_char, terminator ascii_char = uint8 terminator = (uint8) 0

MISCMAPS.DAT
This file contains:

1) campfire/battle screens (11x11 tiles) 2) intro screens (19x4 tiles) 3) script data for the intro

struct Miscmaps_DAT { Map_11x11 battle_maps[4]; Map_19x4 intro_maps[4]; uint8 script_data[0x28F]; };  struct Map_11x11 { Row_11x11 rows[11]; };  // each row is padded with 5 zeroes to make it 16 bytes long struct Row_11x11 { uint8 tiles[11]; const uint8 zeroes[5] = {0,0,0,0,0}; };  struct Map_19x4 { Row_19x4 rows[4]; };  // each row is padded with 13 zeroes to make it 32 bytes long struct Row_19x4 { uint8 tiles[19]; const uint8 zeroes[13] = {0,0,0,0,0,0,0,0,0,0,0,0,0}; };

Notes:

- the intro maps are stored in the order in which they appear during the introduction: 1) "The Summoning" 2) "The Journey" 3) "The Arrival" 4) "The Welcoming"

- the script data controls the movement of NPC's in the introduction - todo: battle screen descriptions, script format

SIGNS.DAT
signs.dat = set(0x21) of offset16, set(0x21) of sign_group

offset16 = uint16 sign_group = set of sign_data

sign_data = header4, set of sign_char, terminator

header4 = location, coord_Z, coord_X, coord_Y location, coord_Z, coord_X, coord_Y = uint8 sign_char = uint8 terminator = (uint8) 0

Notes:

- offset16[i] points to the signs in location i. For locations without signs, the corresponding offset16 is 0. If you remove the zero values, you'll find that the remaining offset16's are sorted in ascending order.

- each sign starts with a 4-byte header, specifying location, z, x and y coordinates. The locations can be the following:

0x0     Britannia/Underworld -- Towns -- 0x1     Moonglow 0x2     Britain 0x3     Jhelom 0x4     Yew 0x5     Minoc 0x6     Trinsic 0x7     Skara Brae 0x8     New Magincia

-- Lighthouses -- 0x9     Fogsbane 0xA     Stormcrow 0xB     Greyhaven 0xC     Waveguide

-- Huts -- 0xD     Iolo's Hut 0xE     Sutek's Hut 0xF     Sin'Vraal's Hut 0x10    Grendel's Hut

-- Castles -- 0x11    Castle British 0x12    Castle Blackthorn

-- Villages -- 0x13    West Britanny 0x14    North Britanny 0x15    East Britanny 0x16    Paws 0x17    Cove 0x18    Buccaneer's Den

-- Keeps -- 0x19    Ararat 0x1A    Bordermarch 0x1B    Farthing 0x1C    Windemere 0x1D    Stonegate

-- Castles of the Principles -- 0x1E    The Lycaeum 0x1F    Empath Abbey 0x20    Serpent's Hold

- Location numbers are identical to those in saved.gam.

z coordinates have the same meaning as in saved.gam:

0xFF = basement/Underworld 0 = ground floor/Britannia 1 = first floor, etc.

- I don't know if the game supports signs in dungeons. - signs can contain characters from both ibm.ch and runes.ch: 0 <= sign_char <= 0x7F --> runes.ch[sign_char] 0x80 <= sign_char <= 0xFF --> ibm.ch[sign_char - 0x80]

UNDER.DAT
The Underworld map. Its size is 256x256 tiles. It is divided into 256 chunks. Each chunk has a size of 16x16 tiles, and each tile is stored as a uint8 (in Ultima 4, the chunk size was 32x32 tiles). Unlike BRIT.DAT, it is not compressed (no chunks were left out). The chunks are stored from west to east, north to south, i.e. the first chunk in the map is the one in the northwest corner. The tiles in a chunk are also stored from west to east, north to south.

= *.HCS =

Font files with 128 characters each.

ibm.hcs contains the Latin characters and a number of symbols.

runes.hcs contains the Britannian runes and the remaining symbols.

File format:

Each character is 16x12 pixels, 1 bit per pixel (0 = black, 1 = white). I don't know which palette index is associated with a 0 or 1. Each byte represents 8 pixels. The most significant bit represents the leftmost pixel, and the least significant bit represents the rightmost pixel.

= *.NPC =

Each file contains 4608 bytes.

There are of course : - CASTLE.NPC - DWELLING.NPC - KEEP.NPC - TOWNE.NPC

CASTLE.NPC
Todo.

DWELLING.NPC
Todo.

KEEP.NPC
Todo.

TOWNE.NPC
It is divided into 8 parts.

These files contain information about NPC's.

The general structure of the whole file is : struct NPC_File { NPC_Info info[8]; // each NPC file has information for 8 maps }; For each city, we have an information entry for the Npcs of the map:

struct NPC_Info { NPC_Schedule schedule[32]; uint8 type[32]; // merchant, guard, etc.  uint8 dialog_number[32]; };

The dialog number gives the entry index to the *.TLK file.

Finally, the schedule says how the Npc moves around in the city and especially when: struct NPC_Schedule { uint8 AI_types[3]; uint8 x_coordinates[3]; uint8 y_coordinates[3]; sint8 z_coordinates[3]; uint8 times[4]; };

Notes:

1) All maps can hold a maximum of 31 (not 32) NPC's. In every map, schedule[0], type[0] and dialog_number[0] are not used. However, type[0] is sometimes 0 and sometimes 0x1C, so perhaps it has some unknown purpose.

2) Each NPC_Schedule contains information about 3 locations that the NPC will go to at different times of day. The x and y coordinates are between 0 and 31, because each map has a size of 32x32 tiles. The z coordinates represent the level, relative to level 0. 0xFF would make the NPC go to the level below level 0, while 0x1 would make the NPC go to the level above level 0.

The times are given in hours, so they range from 0 to 23.

times[0] --> NPC goes to location 0

times[1] --> NPC goes to location 1

times[2] --> NPC goes to location 2

times[3] --> NPC goes to location 1

= *.OVL =

Code or data overlays.

DATA.OVL
Here is the data layout for this file:

 Mapping of Data.ovl

The old list is here for the moment:

offset     length      purpose // compressed strings 0x104C     0x24E       compressed strings used in TALK.DAT each string is a zero-terminated ASCII string // monster flags 0x154C     0x30*2      flags that define the special abilities of                           monsters during combat; 32 bits per monster 0x0020 = undead (affected by An Xen Corp) todo: - passes through walls (ghost, shadowlord) - can become invisible (wisp, ghost, shadowlord) - can teleport (wisp, shadowlord) - can't move (reaper, mimic) - able to camouflage itself - may divide when hit (slime, gargoyle) // settlements and dungeon entrances 0x1E4A     0x28*2      offsets of location name strings; add 0x10 to get the real offset 0x1E9A     0x28        x coordinates of locations 0x1EC2     0x28        y coordinates of locations // moon phases 0x1EEA     28*2        moon phases (28 byte pairs, one for each day of the month) // shrines and mantras 0x1F5E     8*2         offsets of shrine name strings; add 0x10 to get the real offset 0x1F6E     8*2         offsets of mantra strings; add 0x10 to get the real offset 0x1F7E     8           x coordinates of shrines 0x1F86     8           y coordinates of shrines // compressed string offsets 0x24F8     0x81*2      offsets of the compressed strings used in TALK.DAT; add 0x10 to get the real offset // Britannia map chunks (info about the location of the all-water chunks that were left out of BRIT.DAT) 0x3886     0x100       0xFF = the chunk consists only of tile 0x1 else = index into BRIT.DAT // this section contains information about hidden, non-regenerating objects (e.g. the magic axe in the dead tree in Jhelom); there are // only 0x71 such objects; the last entry in each table is 0 0x3E88     0x72        object type (tile - 0x100) 0x3EFA     0x72        object quality (e.g. potion type, number of gems) 0x3F6C     0x72        location number (see "Party Location") 0x3FDE     0x72        level 0x4050     0x72        x coordinate 0x40C2     0x72        y coordinate // dock coordinates (where puchased ships/skiffs are placed) // 0 = Jhelom // 1 = Minoc // 2 = East Brittany // 3 = Buccaneer's Den 0x4D86     0x4         x coordinate 0x4D8A     0x4         y coordinate // scan code translation table: // when the player presses a key that produces one of the scan codes in  // the first table, the game translates it to the corresponding code in   // the second table 0x541E     8           scancodes 0x5426     8           internal codes // wells 0x7252     0x32        wishing for one of these keywords at a wishing well gets you a horse

= *.TLK =

These files contain conversation scripts. There are 4 files for each group of Maps :

The format for each of these files is:

Notes:

1) The first NPC number is 1.

2) The script_indexes are sorted by NPC number, in ascending order.

3) The script_data blocks are sorted by NPC number, in ascending order.

4) The conversations appear to be scripted, like the ones in Ultima 6.

The way this is linked together is via the Npc information since it gives us the dialogue index which links itself to the script index.

The text encoding
For each Npc, there are a certain number of '\0' terminated strings which are encodings of what is the name, job, etc. of the Npc. To decode these texts, I've taken Nodling's decoder and tweaked it a bit.

For each Npc, it starts with a certain number of fixed entries:

- Name, Description, Greeting, Job, Bye

Then it's question/answers with labels.

For the moment, for each entry, I do :

if((c >= 160) && (c < 255)) {           c -= 128; }       else {           special = true; }

If it's a special case, then we have two cases : it's a code based symbol, it's an entry to an array of texts from DATA.OVL (the offset table starts at 0x24f8).

For the moment, I've confirmed these bindings :

If it's not a special case, then I just copy the character in the string.

= General Notes =

1) Wishing Wells

There are two wishing wells in the game: - Paws (location 0x16) - Empath Abbey (location 0x1F)

These locations are hard-coded into the game. There is no difference between horses from wishing wells and horses from vendors. It also doesn't make any difference if you wish for "horse" or a car brand.

= EGA.DRV =

See u5_ega_drv.txt

= INIT.GAM =

Initial "SAVED.GAM".

= SAVED.GAM =

See u5_saved_gam.txt

= Sources =

Nytegard 

http://martin.brenner.de/ultima/u5save.html

http://www.cosy.sbg.ac.at/~lendl/ultima/ultima5/

http://www.wi.leidenuniv.nl/~psimoons/ultima5t.htm

Pieter Simoons has taken down his Ultima 5 website, but it's still cached on http://www.archive.org/

Sheng Long Gradilla 