Some old versions of Nuked SC-55 featured the ability to save the JV-880's NVRAM to a BIN file, which meant that your system settings would not be lost every time you close the emulator. However, this feature was later removed "in favour of future solution".
Since that future solution hasn't materialised yet, this is just a fork that re-adds the old NVRAM code with a couple of modifications (such as making it only run while the emulator is in JV-880 mode, as otherwise NVRAM gets corrupted when you launch in another mode).
Windows builds can also be found on the Releases Page.
(Full disclaimer: I've never worked in C++ before and don't really know what I'm doing, so apologies if my code sucks/looks ugly/has 10 million memory leaks.)