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view layout / view jumper data - they're printed on backside of some boards
(click layout/photo to enlarge)(click JUMPER MANUAL to download)

TK8880F/2066A2 Motherboard

        - BIOS ID string   04/10/95-UMC-881-886A-2A4X5PA1-00
        - BIOS ID string   12/19/94-umc-881/886-2A4X5P01-00
        - 2-72 pin SIMM slots  (1-128meg FPM DRAM)
        - 4-30 pin SIMM slots
        - 3-32bit PCI slots
        - 2-32bit VESA slots
        - 4-16bit ISA slots
        - 128/256KB CACHE support in 8-28pin sockets + 1 TAG RAM socket
        - AWARD Auto-Detect Bios
        - UMC um8886F , um8881F chipset
        - 237pin 80486 ZIF socket 3 which supports these processors:
          INTEL 80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
        - Supports speeds of 25/33/40/50/66 MHz.
        - Manufactured by: CHICONY

        - special thanks to Michel Weijts for taking the photos