R581A
      
      * CPU : Supports Socket 7 for
      - Intel Pentium 90 to 233MHz, P55C (MMX)
      - Cyrix / IBM 6x86, 6x86L, 6x86MX (M2).
      - AMD K5, K6 and other compatible CPUs.
      * Chipset : SiS 5591/5595.
      * Supports 512K/1M Pipelined Burst SRAM in Second Level Cache.
      * Supports 2 x 72-pin SIMM Sockets and 3 x 168-pin DIMM SDRAM or DRAM 
      Sockets.
      - The Memory size from 4MB to 768MB.
      - Supports FP (Fast Page), EDO (Extended Data Out) Mode DRAM and SDRAM.
      * Three 16-bit ISA Slots and Four 32-bit PCI Master Mode Slots.
      * One AGP slot supports both 1X and 2X speed mode with sideband address 
      capability.
      * 2 x IDE Connectors for up to 4 IDE Drivers
      - PIO Mode 4 transfers & Ultra IDE Mode.
      - PCI Bus Master Mode IDE interface.
      - Support Ultra DMA.
      * Universal Serial Bus Controller.
      - Host / HUB Controller.
      - Two USB Ports
      * On Board I/O supports :
      - 2 Serial Ports (16550 Fast UART compatible ).
      - 1 Parallel Port ( ECP and EPP capabilities ).
      - 1 Floppy Disk Controller ( Supports Two FD Drivers ).
      - 1 PS/2 Mouse Connector.
      - 1 IrDA Connector.
      * Flash ROM BIOS with Green, Plug and Play Features.
      * Baby AT Form Factor : 22cm x 27cm or 8.7" x 10.6" (4 
      Layers).