name: HT817D0_20PIN function: 16.8-Second LOG-PCM Speech package: DIP/SOP20,20 manufacturer: Holtek +--()--+ KEY7 | 1 20| KEY6 KEY8 | 2 19| KEY5 KEY9 | 3 18| KEY4 KEY10 | 4 17| KEY3 KEY11 | 5 16| KEY2 KEY12 | 6 15| KEY1 NC | 7 14| FLAG2 VDD | 8 13| VSS AUD | 9 12| FLAG1 OSC2 |10 11| OSC1 +------+ This pinout came from the Chipdir: http://www.chipdir.org/ name: HT817D0_24PIN function: 16.8-Second LOG-PCM Speech package: DIP/SOP24,24 manufacturer: Holtek +--()--+ KEY7 | 1 24| KEY6 KEY8 | 2 23| KEY5 KEY9 | 3 22| KEY4 KEY10 | 4 21| KEY3 KEY11 | 5 20| KEY2 KEY12 | 6 19| KEY1 NC | 7 18| NC VDD | 8 17| NC AUD | 9 16| NC OSC2 |10 15| NC OSC1 |11 14| FLAG2 FLAG1 |12 13| VSS +------+ This pinout came from the Chipdir: http://www.chipdir.org/