Any schematics that we can study? On 9/18/2015 4:18:55 PM, RETRO Innovations <go4retro at go4retro.com> wrote: The unit is a Hitachi 6309C, and I tried both a crystal and I also tried to connect up a functioning 8MHz oscillator. No dice. Jim -- Coco mailing list Coco at maltedmedia.com https://pairlist5.pair.net/mailman/listinfo/coco