The PD78P4038Y, 78K/IV Series' product, is a one-time PROM or EPROM version of the PD784035Y, PD784036Y, PD784037Y, and PD784038Y with internal masked ROM. Since user programs can be written to PROM, this microcontroller is best suited for evaluation in system development, manufacture of small quantities of multiple products, and fast start-up of applications. For specific functions and other detailed information, consult the following user's manual. This manual is required reading for design work. PD784038, 784038Y Sub-Series User's Manual, Hardware : U11316E 78K/IV Series User's Manual, Instruction