name: HT3670C function: Electronic Drum package: DIP40,40 manufacturer: Holtek +--()--+ LEDC | 1 40| LEDA LEDF | 2 39| LEDG LEDD | 3 38| LEDB LEDDOT | 4 37| AUO1 LEDE | 5 36| AUO2 LED1 | 6 35| PVO LED2 | 7 34| VDD C0 | 8 33| NC C1 | 9 32| NC C2 |10 31| NC C3 |11 30| NC C4 |12 29| NC C5 |13 28| NC RESTB |14 27| PD1 R0 |15 26| PD0 R1 |16 25| NC R2 |17 24| OSCI R3 |18 23| VSS R4 |19 22| R7 R5 |20 21| R6 +------+ This pinout came from the Chipdir: http://www.chipdir.org/