name: HT82M91A function: 3D USB Mouse package: DIP18,18 manufacturer: Holtek +--()--+ VSS | 1 18| OSC1 V33O | 2 17| OSC2 USBD+ | 3 16| VDD USBD- | 4 15| LED RESETB | 5 14| M X1 | 6 13| R X2 | 7 12| L Y1 | 8 11| Z2 Y2 | 9 10| Z1 +------+ This pinout came from the Chipdir: http://www.chipdir.org/