7-1 ROM Size and ROM File Size (Required)
Ensure that the size of the ROM file is exactly the same as the capacity of the ROM which will be used for production.Reason
If the ROM file size is not matched exactly to the production ROM size, the mask ROM cannot be produced and the CRC cannot be calculated.Reference
For more detailed information, please refer to the N64 Man Pages.Remarks
Use makerom from the N64 OS/Library with the following options.