Thanks Bob, The pinout of this one is ... 1: Crystal 2: Crystal 3: Output 4: Output 5: Output 6: Output 7: I suspect it's a Reset pin 8: Ground 9: Ground 10: Input ... maybe with Interrupt 11: Input 12: Input 13: ? Pulled High 14: Input 15: Input 16: Supply 5.6 Volts Regards, Roger From: "Bob Blick" > Maybe a TMS1751C or something in that line with a user part number on it. > > TMS1751C is a CMOS 4 bit microcontroller with 512 bytes of ROM, 32(4 > bit) words of RAM, 4 dedicated inputs and 7 dedicated outputs. 3 to 6 > volts operation, 16 pin DIP. Sorry I don't have a pinout. > > Cheers, > > Bob Version: 8.5.392 / Virus Database: 270.13.53/2299 - Release Date: 08/12/09 18:12:00 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist