80486DX OR /DX2 PROCESSOR; SUPERVGA GRAPHICS CONTROLLER; SA450 FLOPPY INTERFACE/IDE HARD DISK INT.; 32-BIT VMEBUS MASTER/SLAVE INTERFACE; PC/ATKEYBOARD INTERFACE; TWO RS232C SERIAL COMMUNICATION PORTS; CENTRONICS PARALLEL PORT; 4 OR 6 MBYTES DUAL ACCESS RAM; 8 KBYTES CPU CACHE MEMORY; I/O BOARD W/ONE EPROM SOCKET FOR VIDEO BIOS/EXTENDED BIOS; CPU BOARD W/ONE EPROM SOCKET FOR SYSTEM BIOS/DIAGNOSTICS; PC/AT/XT BUS EXPANSION CAPABILITY; VMEBUS INTERRUPTER/INTERRUPTER HANDLER; TIME-OF-DAY CLOCK (BATTERY BACKED)