BUFFALO PRODUCTS, INC.

486UV AT

Processor         80486SX/80487SX/80486DX
Processor Speed   20/25/33/50(internal)/50MHz
Chip Set          UMC
Max. Onboard DRAM 32MB
Cache             64/128/256KB
BIOS              AMI/Phoenix
Dimensions        330mm x 218mm
I/O Options       32-bit system memory card, 32-bit local bus slot
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            J1        Turbo switch               J6

  Power LED & keylock         J3        Turbo LED                  J7

  Speaker                     J4        32-bit system memory      JME1
                                        card

  Reset switch                J5        32-bit VESA Local bus     SL1
                                        slot

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select color               JP10             Open

      Monitor type select monochrome          JP10            Closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      20MB        (4) 1M x 9      (4) 4M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

              DRAM CONFIGURATION (WITH MEMORY CARD INSTALLED)

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (4) 256K x 9      NONE           NONE           NONE

     2MB        (4) 256K x 9   (4) 256K x 9      NONE           NONE

     3MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9      NONE

     4MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9  (4) 256K x 9

     4MB        (4) 1M x 9        NONE           NONE           NONE

     5MB        (4) 256K x 9   (4) 1M x 9        NONE           NONE

     6MB        (4) 256K x 9   (4) 256K x 9   (4) 1M x 9        NONE

     8MB        (4) 1M x 9     (4) 1M x 9        NONE           NONE

     9MB        (4) 256K x 9   (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     10MB       (4) 256K x 9   (4) 256K x 9   (4) 1M x 9     (4) 1M x 9

     12MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9        NONE

     16MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     16MB       (4) 4M x 9        NONE           NONE           NONE

     20MB       (4) 1M x 9     (4) 4M x 9        NONE           NONE

     24MB       (4) 1M x 9     (4) 1M x 9     (4) 4M x 9        NONE

     32MB       (4) 4M x 9     (4) 4M x 9        NONE           NONE

     36MB          NONE        (4) 4M x 9     (4) 4M x 9        NONE

     40MB          NONE           NONE        (4) 4M x 9     (4) 4M x 9

     48MB       (4) 4M x 9     (4) 4M x 9     (4) 4M x 9        NONE

     64MB       (4) 4M x 9     (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

            CACHE CONFIGURATION

     Size          Bank 0        Bank 1

     64KB        (4) 8K x 8    (4) 8K x 8

     128KB       (4) 32K x 8      NONE

     256KB       (4) 32K x 8   (4) 32K x 8

                 CACHE JUMPER CONFIGURATION

   Size      JP13      JP14      JP16      JP17      JP18

   64KB     1 & 2      1 & 2     2 & 3     1 & 2    1 & 2

  128KB     2 & 3      1 & 2     2 & 3     2 & 3    1 & 2

  256KB     1 & 2      2 & 3     2 & 3     2 & 3    2 & 3

  Note:Pins designated should be in the closed position.

                          CPU SPEED CONFIGURATION

    Speed          JP1             JP2            JP3             JP8

    20MHz          Open         pins 2 & 3     pins 3 & 4      See note
                                 closed          closed

    25MHz          Open         pins 2 & 3     pins 3 & 4      See note
                                 closed          closed

    33MHz         Closed        pins 1 & 2     pins 1 & 2        Open
                                 closed          closed

    50MHz         Closed        pins 1 & 2     pins 1 & 2        Open
                                 closed          closed

  Note:For 20MHz 486SX/487SX CPU, U14 oscillator frequency can be 20MHz
  or 40mhz. If U14 oscillator frequency is 20mhz, open JP8. If U14
  oscillator frequency is 40 Mhz, close JP8

                            VESA CONFIGURATION

         Type                JP23             JP24             JP25

      Weitek 4167            Open            Closed            Open
       installed

  Local bus installed       Closed            Open             Open

   Weitek & Local bus        Open             Open            Closed
       installed