Ivan "Ironman" Stewart's Super Off Road/RAM map

The following article is a RAM map for Ivan "Ironman" Stewart's Super Off Road.

Gamepad/Controller Variables

Gamepad buttons are automatically set for CPU racers

• 026: Gamepad 1 Buttons
• 027: Gamepad 1 Button Pressed
• 028: Gamepad 2 Buttons
• 029: Gamepad 2 Button Pressed
• 02A: Gamepad 3 Buttons
• 02B: Gamepad 3 Button Pressed
• 02C: Gamepad 4 Buttons
• 02D: Gamepad 4 Button Pressed

The following temporary variables are used to calculate "pressed" buttons

• 02E: Gamepad 1 Previous Buttons
• 02F: Gamepad 2 Previous Buttons
• 030: Gamepad 3 Previous Buttons
• 031: Gamepad 4 Previous Buttons

General Variables

• 024-025: Randomizer
• 033: Current Car (temporary)
• 04C-04D: Previous X-Coordinate (mid-race) / Racer Position A (post-race)
• 04E-04F: Previous Y-Coordinate (mid-race) / Racer Position B (post-race)
• 05A: First Place Car (post-race)
• 05B: Second Place Car (post-race)
• 05C: Third Place Car (post-race)
• 05D: Last Place Car (post-race)
• 05E-05F: Previous Z-Coordinate (mid-race)
• 060-061: Player Struct Address
• 723: Current track (Determined by Race Number 7E0 and table FB69)
  • 00 = Sidewinder
  • 01 = Huevos Grande
  • 02 = Big Dukes
  • 03 = Hurricane Gulch
  • 04 = Wipeout
  • 05 = Fandango
  • 06 = Blaster
  • 07 = Cliffhanger
  • 08-0F = Reversed versions of 00-07.
• 72D: Number of Players (1-4), set to 0 during the demo race
• 725: Current Player (temporary)
  • Parent variable of $033
• 727: Current Car Tire Traction
• 728: Flagger Timer
• 729: Bonus Item Value
  • Determines sprite, palette, and bonus value
• 72A: Bonus Item X
• 72B: Bonus Item Y
• 72C: Bonus Item Timer
• 736: Frame Counter
• 737-73B: Stopwatch
• 746: HUD Draw Timing
  • Updates laps & nitros if less than 4, otherwise updates every other digit in stopwatch (max 0x06)
• 74E-751: Prize Amount (post-race)
• 754: Current Car Airborne Value
• 7AC: Continue Allowed
• 7AD-7AE: CPU Reverse Delay
  • Starts at 0x12C each race, ignores 72E-735 while counting down
• 7AF: Race Number
  • Determines CPU difficulty, etc.
• 7B0: Race Checkpoint Number (0x0E = championship start, 0x63 = championship/game over)
• 7CA: Name Entry Input Delay
  • Ignores gamepad input on Name Entry screen every 0x0A frames
• 7DE: Cash Bonus Value
  • From 0x01 to 0x05, but 0x06 also works
• 7DF: Nitro Bonus Value
  • From 0x07 to 0x0F
• 7E0: Race Track Pointer
  • Counts up to 0x2A then loops back to 0x1B, determines race track
• 7E2: Game Difficulty/CPU Minimum Speed (20-DC)
  • Initial Value is 0x20 and increases by 2 on race number 2, 4, 6, 8, and 10+
  • CPU speed will always be between 0x30 and 0xB0, however

Player Arrays

Note: These are all in sets of 4, in order of player

• 05A-05D: Y-Coordinate Placeholder (mid-race)
  • Cars are moved to top of screen during collision checks, this saves their y-coordinates
• 083-086: X-Coordinate
• 087-08A: Subpixel X-Coordinate
• 08B-08E: Y-Coordinate
• 08F-092: Subpixel Y-Coordinate
• 093-096: Driving Direction
  • Between 0x00 (left) and 0xBF
• 097-09A: Speed
• 09B-09E: Z-Coordinate / Height
• 09F-0A2: Fractional Z-Coordinate / Height
• 0A3-0A6: Airspeed
• 0A7-0AA: Fractional Airspeed
• 0AB-0AE: Gravity
  • Increases while in air, then added to Airspeed
• 0AF-0B2: Shadow Z-Coordinate / Height
• 0B3-0B6: Hangtime
  • Set to 1/64th car Speed upon leaving the ground
• 0B7-0BA: Steering Direction
  • Between 0x00 (left) and 0xBF
  • Every 8 angles changes sprite, allowing for 24 sprites
• 0BB-0BE: Pitch
  • From 0x01 (slightly angled) to 0x07 (steep angle), or 0x08 (level)
• 0BF-0C2: Sprite Address (low-byte)
• 0C3-0C6: Sprite Address (high-byte)
• 0C7-0CA: Nitro State
• 0CB-0CE: Nitro Timer
• 0CF-0D2: Nitro Sprite (low-byte)
• 0D3-0D6: Nitro Sprite (high-byte)
• 0D7-0DA: Turning Direction
• 0DB-0DE: Centrifuge
  • Resistance to turning, based on Speed
• 72E-731: Reverse Point X-Coordinate
• 732-735: Reverse Point Y-Coordinate
  • These may have been a used at some point to prevent CPU cars getting stuck
• 74A-74D: Calculated Pitch (mid-race)
• 74E-751: Calculated Z-Coordinate (mid-race)
• 755-758: Previous Pitch (nose/tail angle)
  • 0x01 = slight pitch, 0x07 = steep pitch, 0x08 = level
• 75D-760: Lives
• 7A8-7AB: Eliminated Flag
  • 00 = live, FF = eliminated, CPU plays for this player
  • Note: If all players are eliminated, or there are 0 players in the game, the game crashes at the menu between races.

Player Structs

Player structure located around address $300, has 0x47 bytes per player.

Player 1:

• 300-303: Name
• 304: Negative Cash Balance
  • Drops to 0xFF if player has insufficient funds
• 305-30C: Money (8 digits, left digit first)
• 30D: Country (00 = USA, 01 = Italy, 02 = Germany, 03 = Britain, 04 = France, 05 = Japan, 06 = Canada, 07 = Austraila, 08 = Leland)
• 30E: Shocks (0-6)
• 30F: Tires (0-6)
• 310: Nitros (0-99)
• 311: Acceleration (0-6)
• 312: Top Speed (0-6)
• 313-33A: Track Records
• 33C: Cash Picked Up
• 33D: Car ID
• 33E: Gamepad Pointer
  • Refer to variables 026-02D
• 33F: Lap Counter (1-5, set to 05 to instantly win a race)
• 340: Debris Sprite
• 341: Debris X-Coordinate
• 342: Debris Y-Coordinate
• 343: Debris Animation Timer
• 344: Track Position
• 345: Track Data Offset
• 346: Airborne
  • Set when off the ground, prevents acceleration

Player 2:

• 347-34A: Name
• 34B: Negative Cash Balance
  • Drops to 0xFF if player has insufficient funds
• 34C-353: Money (8 digits, left digit first)
• 354: Country (00 = USA, 01 = Italy, 02 = Germany, 03 = Britain, 04 = France, 05 = Japan, 06 = Canada, 07 = Austraila, 08 = Leland)
• 355: Shocks (0-6)
• 356: Tires (0-6)
• 357: Nitros (0-99)
• 358: Acceleration (0-6)
• 359: Top Speed (0-6)
• 35A-381: Track Records
• 383: Cash Picked Up
• 384: Car ID
• 385: Gamepad Pointer
  • Refer to variables 026-02D
• 386: Lap Counter (1-5, set to 05 to instantly win a race)
• 387: Debris Sprite
• 388: Debris X-Coordinate
• 389: Debris Y-Coordinate
• 38A: Debris Animation Timer
• 38B: Track Position
• 38C: Track Data Offset
• 38D: Airborne
  • Set when off the ground, prevents acceleration

Player 3:

• 38E-391: Name
• 392: Negative Cash Balance
  • Drops to 0xFF if player has insufficient funds
• 393-39A: Money (8 digits, left digit first)
• 39B: Country (00 = USA, 01 = Italy, 02 = Germany, 03 = Britain, 04 = France, 05 = Japan, 06 = Canada, 07 = Austraila, 08 = Leland)
• 39C: Shocks (0-6)
• 39D: Tires (0-6)
• 39E: Nitros (0-99)
• 39F: Acceleration (0-6)
• 3A0: Top Speed (0-6)
• 3A1-3C8: Track Records
• 3CA: Cash Picked Up
• 3CB: Car ID
• 3CC: Gamepad Pointer
  • Refer to variables 026-02D
• 3CD: Lap Counter (1-5, set to 05 to instantly win a race)
• 3CE: Debris Sprite
• 3CF: Debris X-Coordinate
• 3D0: Debris Y-Coordinate
• 3D1: Debris Animation Timer
• 3D2: Track Position
• 3D3: Track Data Offset
• 3D4: Airborne
  • Set when off the ground, prevents acceleration

Player 4:

• 3D5-3D8: Name
• 3D9: Negative Cash Balance
  • Drops to 0xFF if player has insufficient funds
• 3DA-3E1: Money (8 digits, left digit first)
• 3E2: Country (00 = USA, 01 = Italy, 02 = Germany, 03 = Britain, 04 = France, 05 = Japan, 06 = Canada, 07 = Austraila, 08 = Leland)
• 3E3: Shocks (0-6)
• 3E4: Tires (0-6)
• 3E5: Nitros (0-99)
• 3E6: Acceleration (0-6)
• 3E7: Top Speed (0-6)
• 3E8-40F: Track Records
• 411: Cash Picked Up
• 412: Car ID
• 413: Gamepad Pointer
  • Refer to variables 026-02D
• 414: Lap Counter (1-5, set to 05 to instantly win a race)
• 415: Debris Sprite
• 416: Debris X-Coordinate
• 417: Debris Y-Coordinate
• 418: Debris Animation Timer
• 419: Track Position
• 41A: Track Data Offset
• 41B: Airborne
  • Set when off the ground, prevents acceleration