Legacy Reverse-Engineering Resources

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These references support work on the original Fallout binaries and older tooling. For source-level engine research, start with the Community Edition and Reference Edition projects listed under Projects.

The binary offsets, compiler notes, and databases below are retained for historical reference and compatibility work. Check the executable version before using an offset or database; these resources are not a current source-code reference.

Fallout2.exe

Structures

Sfall references

Fallout 2 RE references

Function and variable offsets

Call structure

x64dbg database

Historical IDA database

f2_res.dll (High resolution patch)

Symbols

Watcom

Watcom is the compiler that was used to compile both Fallout 1 and 2.

Watcom does not support the __fastcall keyword except to alias it to null. The register calling convention may be selected by command line switch. (However, IDA uses __fastcall anyway for uniformity.)

Up to 4 registers are assigned to arguments in the order eax, edx, ebx, ecx. Arguments are assigned to registers from left to right.

If any argument cannot be assigned to a register (say it is too large) it, and all subsequent arguments, are assigned to the stack. Arguments assigned to the stack are pushed from right to left. Names are mangled by adding a suffixed underscore.

eax->func(edx, ebx, ecx, push...)

func(eax, edx, ebx, ecx, push...)