SIMATIC IPC427C (Microbox PC), Processor: Core 2 Duo 1.2 GHz, 800 MHz FSB, 3 MB SLC, PROFIBUS DP 12 Memory configuration: 1 GByte DDR3 1066, SODIMM Extension (HW): second with RS232 interface in expansion rack Drive can be swapped (accessible): 2 GB CompactFlash replaceable Internal drive (not accessible) without internal drive Operating system: without operating system