These cartridges are designed for my other project called Famisyn
List so far:
OPN2(C) (YM2612 and YM3438)
EPSG (AY-3-8910 clones and AY8930)
SID (MOS658x and MOS8580)
STM32 LQFP48 used for sound
STM32 LQFP100 used for sound ... and possibly another full project
And various one off prototypes using various sound chips.