The PD178P018ANote is a device in which the internal mask ROM of the PD178018A is replaced with a onetime PROM or EPROM. Because this device can be programmed by users, it is ideally suited for system evaluation, small-lot and multipledevice production, and early development and time-to-market. The PD178P018A is a PROM version corresponding to the PD178004A, 178006A, and 178016A.