I repaired a Bally Squawk & Talk some time ago for a friend. I replaced the 6808/6810 with a 6802 and used its internal memory. There were some complaints that after that -the board was running in a Fireball 2- a few sound effects changed in a bad way. When reverting back to a 6808/6810 everything was back to normal again. Since then, I am not running 6802's on their internal memory anymore on Squawk & Talk boards.