name: 12C509 function: Microcontroller, 8-bit, 1024x12 bit EPROM, 41 byte RAM package: PDIP,8 manufacturer: Microchip added-by: James Cameron +--()--+ Vdd | 1 8| Vss GP5/OSC1/CLKIN | 2 7| GP0 GP4/OSC2 | 3 6| GP1 GP3/MCLR*/Vpp | 4 5| GP2/TOCKI +------+ This information was added by a third party and may be incorrect. This pinout came from the Chipdir: http://www.chipdir.org/