UNIDENTIFIED

486NL

Processor   CX486S/80486SX/CX486DX/80486DX/CX486DX2/80486DX2/Pentium
            Overdrive
Processor   20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set    OPTI
Max. Onboard32MB
DRAM
Cache       64/128/256KB
BIOS        AMI
Dimensions  254mm x 220mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            J6        Speaker                   J24

  Power LED & keylock         J20       Turbo switch              JJ23

  Reset switch                J22       32-bit VESA local      SL1 & SL2
                                        bus slots

  Turbo LED                   J23

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CMOS memory normal operation             J1           pins 2 & 3
                                                              closed

      CMOS memory clear                        J1           pins 1 & 2
                                                              closed

  »   Monitor type select color                J3             Closed

      Monitor type select monochrome           J3              Open

  »   Cyrix CPU type select CX486DX2          J19           pins 1 & 2
                                                              closed

      Cyrix CPU type select CX486DX           J19           pins 2 & 3
                                                              closed

  »   CPU type select Intel                   J21           pins 2 & 3
                                                              closed

      CPU type select Cyrix                   J21           pins 1 & 2
                                                              closed

  »   CPU type select PGA                     J29             Closed

      CPU type select PQFP                    J29              Open

              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

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

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

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1       TAG (U25)      TAG (U26)

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8        NONE

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

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 8K x 8     (1) 8K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 32K x 8       NONE

                        CACHE JUMPER CONFIGURATION

     Size           J8             J9             J10            J14

     64KB        pins 2 & 3       Open         pins 1 & 2        Open
                  closed                        closed

    128KB        pins 1 & 2      Closed        pins 2 & 3        Open
                  closed                        closed

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

                          CPU TYPE CONFIGURATION

       Type               J11               J12                J13

      80486SX          pins 1 & 2           Open            pins 2 & 3
                         closed                              closed

      80486DX          pins 2 & 3          Closed           pins 1 & 2
                         closed                              closed

                          CPU SPEED CONFIGURATION

    Speed           J15           J16            J17             J18

    25MHz         Closed          Open        pins 1 & 2      pins 2 & 3
                                                closed         closed

    33MHz          Open          Closed       pins 1 & 2      pins 2 & 3
                                                closed         closed

    40MHz         Closed         Closed       pins 2 & 3      pins 2 & 3
                                                closed         closed

    50iMHz        Closed          Open        pins 1 & 2      pins 2 & 3
                                                closed         closed

    50MHz         Closed          Open        pins 2 & 3      pins 1 & 2
                                                closed         closed

    66iMHz         Open          Closed       pins 1 & 2      pins 2 & 3
                                                closed         closed

  VESA WAIT STATE CONFIGURATION

   Wait states          J28

  0 wait states        Open

  1 wait state        Closed

  BUS SPEED CONFIGURATION

  CPU speed        J25

   <= 33MHz        Open

   > 33MHz        Closed