- also known by part#: 48.84601.002  or  49.84601.001
        - AMI BIOS ID String: 40-0100-001770-00101111-040493-UMC491-H
        - 8-30 pin SIMM slots  (1-64meg FPM DRAM)
        - 3-32bit VESA Local Bus slots
        - 6-16bit ISA slots
        - 1-8bit XT slots
        - 128k,256k 20ns cache in 8-28pin sockets + 1 TAG RAM socket
        - AMI 1993 Auto-Detect BIOS.
        - external cmos 3.6v battery J1 - pin1 +
        - UMC um82c491f, um82c493f chipset
        - ZIF 237pin CPU socket 2 which supports these processors:
          INTEL 80486SX/SX2,80486DX/DX2, P24T
          CYRIX CX486DX(M6), CX486DX2(M7)
          AMD AM486SX/DX, AM486DX2
        - Supports speeds of 25/33/40/50/66 MHz.
        - Manufactured by: A-Open