UNIDENTIFIED

VESA 486 Version 1.1

Processor        80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed  25/33/50(internal)/50MHz
Chip Set         UMC
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       220mm x 220mm
I/O Options      None
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  External battery            J1       Speaker                     J7

  Turbo LED                   J4       Power LED & keylock         J8

  Turbo switch                J5       32-bit VESA Local bus       S1
                                       slot

  Reset switch                J6       32-bit VESA Local bus       S2
                                       slot

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select color               JP1           pins 2 & 3
                                                              closed

      Monitor type select monochrome          JP1           pins 1 & 2
                                                              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

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8

     128KB      (4) 32K x 8        NONE       (1) 8K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (2) 32K x 8

                        CACHE JUMPER CONFIGURATION

    Size          JP8            JP9            JP10            JP11

    64KB          Open          Open         pins 1 & 2       pins 1 & 2
                                               closed          closed

   128KB          Open         Closed        pins 2 & 3       pins 2 & 3
                                               closed          closed

   256KB         Closed        Closed        pins 2 & 3       pins 1 & 2
                                               closed          closed

                          CPU TYPE CONFIGURATION

          Type                     JP14                     JP15

         80486SX             pins 2 & 3 closed              Open

         80487SX            pins 1 & 2 and 3 & 4     pins 2 & 3 closed
                                  closed

         80486DX            pins 1 & 2 and 3 & 4     pins 1 & 2 closed
                                  closed

        ODP486SX            pins 1 & 2 and 3 & 4     pins 2 & 3 closed
                                  closed

        80486DX2            pins 1 & 2 and 3 & 4     pins 1 & 2 closed
                                  closed

                      CPU SPEED CONFIGURATION

   Speed        JP4           JP5           JP6           JP7

   25MHz       Closed        Closed         Open          Open

   33MHz       Closed         Open          Open          Open

  50i MHz      Closed        Closed         Open          Open

   50MHz        Open          Open          Open          Open

              VESA WAIT STATE/BUS SPEED CONFIGURATION

    CPU speed      Wait states          JP12            JP13

     £ 33MHz      0 wait states         Open            Open

     > 33MHz       1 wait state        Closed          Closed