The Z80185 and Z80195 are smart peripheral controller devices designed for general data communications applications, and architected specifically to accommodate all input and output (I/O) requirements for serial and parallel connectivity. Combining a high-performance CPU core with a variety of system and I/O resources, the Z80185/195 are useful in a broad range of applications. The Z80195 is the ROMless version of the device. The Z80185 and Z80195 feature an enhanced Z8S180 microprocessor linked with one enhanced channel of the Z85230 ESCCTM serial communications controller, and 25 bits of parallel I/O, allowing software code compatibility with existing software code.