UNIDENTIFIED

US3486-33/50C(USAi)

Processor        80386SX/80386DX/CX486DLC/80486SX/80486DX/80486DX2
Processor Speed  20/25/33/40(internal)/50(internal)/50/66(internal)MHz
Chip Set         USAi
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       230mm x 218mm
I/O Options      32-bit VESA local bus slots (2)
NPU Options      80387

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Power LED & keylock         J2       External battery            J7

  Turbo switch                J4       Speaker                    J100

  Turbo LED                   J5       32-bit VESA Local bus   SL1 & SL2
                                       slots

  Reset switch                J6

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select monochrome           J3              Open

      Monitor type select color                J3             Closed

  »   CMOS memory normal operation            JMP3          pins 2 & 3
      (Internal Battery)                                      closed

      CMOS memory normal operation            JMP3          pins 1 & 2
      (External Battery)                                      closed

      CMOS memory clear                       JMP3          pins 2 & 4
                                                              closed

  »   NPU disabled                            JMP4          pins 2 & 3
                                                              closed

      NPU enabled                             JMP4          pins 1 & 2
                                                              closed

  »   CPU type select 80386DX not             JMP5             Open
      installed

      CPU type select 80386DX                 JMP5            Closed
      installed

  »   CPU type select 80486DX-50 not          JMP7             Open
      installed

      CPU type select 80486DX-50              JMP7            Closed
      installed

              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

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

      16MB        (4) 4M x 9         NONE

      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    (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

         Size                     JMP1                     JMP8

         64KB            pins 1 & 2, 4 & 5, 7 &      pins 1 & 2, 4 & 5
                                8 closed                  closed

         128KB           pins 2 & 3, 5 & 6, 8 &      pins 2 & 3, 5 & 6
                                9 closed                  closed

         256KB           pins 2 & 3, 5 & 6, 8 &      pins 2 & 3, 5 & 6
                                9 closed                  closed

                          CPU TYPE CONFIGURATION

          Type                    JMP10                    JMP12

         80386              pins 2 & 5, 3 & 6               Open
                                 closed

         80486                    Open                     Closed

          CPU TYPE CONFIGURATION

        Type                 JMP2

       80486SX        pins 1 & 2 closed

       80486DX        pins 2 & 3 closed

                       CPU SPEED CONFIGURATION

               Speed                              JMP9

               20MHz                    pins 2 & 6, 3 & 7 closed

               25MHz                    pins 2 & 6, 4 & 8 closed

               33MHz                    pins 3 & 7, 4 & 8 closed

               40MHz                       pins 2 & 6 closed

               50MHz                       pins 3 & 7 closed

              66iMHz                pins 1 & 5, 3 & 7, 4 & 8 closed

              VESA BUS SPEED CONFIGURATION

           Speed                       JMP6

     80486DX-33/DX2-66       pins 1 & 4, 3 & 6 closed

         80486DX-50              pins 1 & 4 closed