General Vritual Machine architecture
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Final Fantasy XII contains a stack based virtual machine that runs field and event scripts. The implementation seems to be exactly the same starting with Japanese PS2 release, through PS4, PC and Nintendo Switch versions. The only thing that changes are available calls. Each subsequent version supports all previous calls and includes a few dozen of new ones at most.
General VM specifications are as follows:
| Type | stack based |
|---|---|
| Integer registers | 4 (I0 to I3) |
| Float registers | 4 (F0 to F3) |
| Special registers | 3 (X, Y, A) |
| Number of instructions | 100 |
| Maximum stack size | unknown |
