Before revision: The NEC µPD765 , announced in 1978 and in 1979 NEC introduced the μPD72068, which was software compatible with the μPD765, incroporating a Digital PLL.
After revision: The NEC µPD765 was announced in 1978 and in 1979 NEC introduced the μPD72068, which was software compatible with the μPD765, incroporating a Digital PLL.