Atic Atac Data Format

ATIC ATAC DATA FORMAT
this document contains the data format for atic atac, it is not complete but gives a good start and understanding. for futher information download atic atac source this may help fill in some of the blanks. should you find any errors with this document or indeed have any information to add, please send me an email.

address	0xA854	screen table
	the screen table has a entry for every screen

type	offset	description
BYTE	00	attribute - colour for this screen
BYTE	01	type - screen image type from the following list

screen types


00	01	02	03	04

05	06	07	08	09

10	11 the final screen	12 the fallin screen

address	0xA982	screen types data
	the screen types data allows the construction of all the above screen data. the table works with a list of points and then effective lineto instructions using these points.

type	offset	description
BYTE	00	width - width of interior
BYTE	01	height - height of interior
WORD	02	points - offset to points data
WORD	04	lineto - offset to lineto data
points
BYTE	00	x position
BYTE	01	y position

lineto
BYTE	00	point index
	this table list all the points required to draw the screen. it is used by first reading an entry. if the value is 255 then we have finished. this is the entry to the first point. we then read the next entry and draw a line from the first point to this point. we keep reading until the entry = 255, and draw always from the first point to this. psuedo code: do read lineto_entry if lineto_entry == 255 then exit do startpoint = points[lineto_entry] do read lineto_entry if lineto_entry == 255 then exit do endpoint = points[lineto_entry] drawline from startpoint to endpoint loop loop

address	0x645D	background items
	this table is all the background items for all the screens. if an item is connected to another item on another screen then the item it is connected to is either before or after this entry depending on if it is an odd or even entry eg. 0 connects to 1, 3 connects to 2. etc.

type	offset	description
BYTE	00	graphic - graphic representaion of this entry
BYTE	01	screen - screen this entry belongs to
BYTE	02	unknown but common 0x34,0x38,0xc4 (0 if not a door)
BYTE	03	x position
BYTE	04	y position
BYTE	05	flags - ( do not fully understant )
		rotation 0x00=top, 0x60=right, 0x80=bottom, 0xE0=left or other common values... 0x41 - 0x11 0x04 - used if table 0x12 0x03 - used if trapdoor 0x19 used by rug 0x1b ---- these are used by objects that are doors ---- 0x01 - 0x10 0x61 - 0x10, 0x11 0x81 - 0x10, 0x11, 0x015, 0x16, 0x26 0xe1 - 0x10, 0x11, 0x1a, 0x26
BYTE	06	door timing? time a door is open or closed (0 if not a door)
BYTE	07	unknown (0 if not a door)

address	0x757D	screen backround item start
	index by screen. this gives an offest into the background item list.

type	offset	description
WORD	00	offset into background list

address	0x76A9	screen background items
	variable length table. each entry points into the background item table.

type	offset	description
WORD	00	offset - offset into background items, read until = 0

address	0xA64E	background graphics attribute table

type	offset	description
WORD	00	offset - offset to attribute data

address	0xA600	background graphics table

type	offset	description
WORD	00	offset - offset to sprite data

graphic data
BYTE	00	width - in bytes
BYTE	01	depth
BYTE	03 ...	image data ( size = width*depth )

graphic types


	01 cave door frame	02 normal door frame	03 big door frame

08 red locked normal door	09 green locked normal door	10 white locked normal door	11 yellow locked normal door

12 red locked cave door	13 green locked cave door	14 white locked cave door	15 yellow locked cave door

16 clock	17 picture	18 table	19 full chicken

20 chicken carcass	21 antler trophy	22 trophy	23 bookcase

24 shut trapdoor	25 open trapdoor	26 barrel	27 rug

28 ACG shield	29 shield	30 knight

32 shut normal door	33 open normal door	34 shut cave door	35 open cave door

36 ACG exit door	37 picture	38 skeleton	39 barrels

address	0xA4BE	sprites graphics table

type	offset	description
WORD	00	offset - offset to sprite data

graphic data
BYTE	00	depth
BYTE	02 ...	image data ( size = width*depth ) WIDTH = 2