4bit mono ADPCM, 7.575 kHz sample rate.
Lots of Semicom samples in here, plus some badly sampled jingles and sound effects from a Snow Bros. PCB.
The irony is that a lot of Korean games used YM3812 chips by that point, so why they didn't just put an actual 3812 on the mobo to get the proper Snow Bros. sound is anyone's guess.