First, let’s break down the acronym. NVRAM stands for Non-Volatile Random Access Memory. In simple terms, it’s a type of computer memory that retains stored data even after the power is turned off.
In the context of arcade cabinets running Tekken 3 (on Namco System 12 hardware), NVRAM serves two critical functions:
Unlike a home console (PlayStation) that used memory cards and a battery-backed clock, arcade machines used a small, battery-powered NVRAM chip soldered directly onto the main board. When the arcade cabinet was unplugged, the battery kept the NVRAM alive.
Tekken 3 saves to whichever slot is active. tekken 3 nvram
For emulation users, NVRAM is a blessing—if handled correctly.
The exact offsets can vary by region/version, but a reverse-engineered structure shows:
| Offset (hex) | Size | Content | |--------------|------|---------| | 0x000–0x03F | 64 B | System configuration (coin slots, difficulty, timer, attract mode, region) | | 0x040–0x0FF | 192 B | High scores (top 10–15, with character codes & names) | | 0x100–0x13F | 64 B | Unlock flags (Dr. B, Gon, Tiger, Extra costumes, Team Battle mode) | | 0x140–0x1FF | 192 B | Statistics (total plays, character usage counts, win ratios) | | 0x200–0x7FF | ~1.5 KB | Padding / unused (or extra region-specific data) | | Last 2 bytes | 2 B | Checksum (simple XOR or additive sum of first N bytes) | First, let’s break down the acronym
Note: If you modify NVRAM without recalculating the checksum, the game will reject it and reset all data.
Located on the PCB (Printed Circuit Board), the NVRAM works in conjunction with a lithium coin battery (typically a CR2032 or a specialized rechargeable battery in older revisions). A "keep-alive" circuit ensures that when the arcade cabinet power is switched off, the battery supplies a low-voltage trickle charge to the SRAM, preserving the bits stored within it.
Because the arcade version of Tekken 3 lacks unlockable characters, NVRAM files are largely shared for two niche purposes: Unlike a home console (PlayStation) that used memory
Here's an example of how to read and write to the NVRAM using a hypothetical programming interface:
import nvram
# Initialize NVRAM interface
nvram.init()
# Read high score table
high_scores = nvram.read_high_scores()
print(high_scores)
# Write new high score
nvram.write_high_score("Player1", 1000000)
# Read game settings
settings = nvram.read_settings()
print(settings)
# Write new game settings
nvram.write_settings("difficulty": 3, "game_mode": 1)
Note that this code snippet is purely hypothetical and not intended for actual use.
Method 1: Using the Service Menu
Method 2: Delete the NVRAM File (Simplest)
Method 3: Disable NVRAM (Not Recommended) Some emulators allow you to disable NVRAM saving entirely. While this prevents errors, it also means you will never save high scores or your preferred difficulty settings (they will reset every boot).