Trackdata

Trackdata is a set of twenty three data structures which hold key information about the track in use and the lap being driven or replayed on it. Each of the individual data structures is referred to as trackdataXX, with XX being a two-digit number. The current systematisation of Trackdata is chiefly based on the results of the restunts projects, though parts of it have been independently discovered and rediscovered over the years.

Finding Trackdata in memory

The most convenient targets to look for when using a debugger to locate Trackdata in memory are trackdata11 (highscore table), trackdata13 (replay file header) and trackdata14 (element map as in the track file). Keep in mind that different parts of Trackdata might be loaded or not depending on the current game phase (pre-lap, playing, replaying, or post-lap).

Trackdata data structures

Offsets and byte sizes assume the 1991 DOS versions of Stunts.

#	Offset (hex)	Size (hex)	Size	Layout	Description	Notes
01	0	70a	1802
02	70a	70a	1802
03	e14	70a	1802
04	151e	80	128
05	159e	80	128
06	161e	80	128
07	169e	80	128
08	171e	60	96
09	18fe	180	384
10	1a1e	120	288
11	1b8a	16c	364
12	1c7a	f0	240
13	1c9a	1a	26
14	2019	385	901
15	239e	385	901
16	527e	2ee0	12000
17	5603	385	901
18	5988	385	901
19	5d0d	385	901
20	64b9	7ac	1964
21	683e	385	901
22	6bc3	385	901
23	6bf3	30	48