HT37A70/60/50/40/30/20 8-Channel Music Synthesizer.
Holtek Semiconductor
HT37A40 - (HT37A20 - HT37A70) 8-Channel Music Synthesizer MCU
HT37A70/60/50/40/30/20 8-Channel Music Synthesizer MCU Technical Document · Tools Information www.datasheet4u.com · FAQs · Application Note - HA0075E .