The m PD78P368A is produced by replacing the internal mask ROM of the m PD78366A with a one-time PROM or EPROM. One-time PROM products, in which data can be written once are effective for manufacture of small quantities of multiple products and early stage start-up of application. EPROM products, to which programs can be re-written after previously written programs have been erased, are suited for system evaluation. The following user's manual describes the details of functions. Be sure to read it before design.