CPU 363 Module, (240 Kbytes Configurable User Memory, 4K I/O, 8 Racks), 2 Built-In Serial Port, .22 msec/K is a single slot CPU that is a PCM module for RTU master support. With 3 built in port the module supports SNP/SNP-X master CCM, or RTU slave support also has a processor speed of 25 megahertz and that has user programabale memory Depends on assigned values for configurable word memory at a maximum of 240K Bytes and register memory configurable from 128 to 32,640 words, in 128 word increments.