Swaps .n64, .v64 and .z64 roms. Written in Python 3. You must install numpy via e.g. pip. Code is kinda messy.
n64swap.py [-h] input output
.z64 is the correct format and should be used. This handy table shows the difference:
| ROM format | Type | First 4 bytes | Game Title in ROM |
|---|---|---|---|
| .z64 | Big Endian | 80 37 12 40 | SUPER MARIO 64 |
| .v64 | Byteswapped | 37 80 40 12 | USEP RAMIR O64 |
| .n64 | Little Endian | 40 12 37 80 | EPUSAM R OIR 46 |
(Note that there are two spaces after both "64", they don't seem to show up here.)