name: HT99C811C function: Cordless Phone Controller package: CERDIP window40,40 manufacturer: Holtek +--()--+ PB5 | 1 40| PB6 PB4 | 2 39| PB7 PA3 | 3 38| PA4 PA2 | 4 37| PA5 PA1 | 5 36| PA6 PA0 | 6 35| PA7 PB3 | 7 34| OSC2 PB2 | 8 33| OSC1 PB1 | 9 32| VDD PB0 |10 31| AVDD PD7 |11 30| RESB PD6 |12 29| TMR1 PD5 |13 28| PD3 PD4 |14 27| PD2 VSS |15 26| NC AVSS |16 25| PD1 INTB |17 24| PD0 TMR0 |18 23| AOUT PG0 |19 22| PG3 PG1 |20 21| PG2 +------+ This pinout came from the Chipdir: http://www.chipdir.org/