But I did come across a free plugin for lo-fi wavetable synthesis, AKA Nintendo sounds. I made this from memory. Some people may recognize it as the level 1 music from Beetlejuice for the NES. Others will close their browser and proclaim me to be a freak.
Others will also remember the mental image of Andrew as the Beetlejuice at Universal Studios (“Don’t say the B-Word!”).
Chip32 is available in both VSTi and Audio Unit. This page also has a bunch of other VST/AU downloads.