BAS (File Format)
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BAS (Binary AI Speed) is a filetype found into competitions, specifically found as AIParam.bas; it changes the speed parameters for the Mario Kart Wii's in race CPUs. AIParam can be added into any track to make more challenging gameplay in offline versus races. When this file is not present, the parameters are controlled instead by kartAISpdParam.bin, found into Common.szs.
File Format
BAS files are only 20 bytes long, containing 5 floats:
| Offset | Type | Description |
|---|---|---|
| 0x00 | Float | Speed advantage. This value is added to the CPUs' base speed. |
| 0x04 | Float | Speed bias. It seems to be some kind of speed multiplier. Bigger values mean slower. |
| 0x08 | Float | Base speed. Minimum speed value for the CPUs while driving? |
| 0x0C | Float | Parameter. Only seems to be checked in competition mode:
|
| 0x10 | Float | CPU difficulty override. Accepted values (in float format): 0 (Easy), 1 (Normal), 2 (Hard). |
Trivia
The first ever Nintendo competition contained a BAS file that was 16 bytes long, missing the last float.
Tools
The following tools can handle BAS files:
- BASic Tool, by TheZACAtac