SIEMENS SIMATIC MICROBOX PC 420 INTERFACES ON BOARD OF 2X LAN(RJ45); 1X GRAPHICS(DVI-I); 1X SERIAL (COM1); 4X USB 2.0; UP TO 3 SLOTS PC/104- PLUS TEMPERATURE MONITORING; 24 V DC INDUSTRIAL POWER SUPPLY PROCESSOR: CELERON 400 MHZ, 100 MHZ FSB, CAN MEMORY EXTENSION: 128 MBYTE SDRAM-133 (1X128 MB) DRIVES: 40 GB HDD EIDE OPERATING SYSTEM: WITHOUT OPERATING SYSTEM