
VEXTREC TECNHOLOGY, INC.

GMB-486UNP (VER. 3.01)

Processor  CX486S(WB)/CX486S(WT)/CX486S2(WB)/CX486S2(WT)/80486SX/
           80487SX/CX486DX(WB)/CX486DX(WT)/CX486DX2(WB)/CX486DX2(WT)/80486DX/80486DX2/P24T
Processor  25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set   Unidentified
Video Chip None
Set
Maximum    128MB
Onboard
Memory
Maximum    None
Video
Memory
Cache      32/64/128/256KB
BIOS       AMI
Dimensions 254mm x 218mm
I/O        32-bit VESA local bus slots (3)
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  External battery          J2         Turbo switch         J51 pins 15 -
                                                                 17

  Power LED &         J51 pins 1 - 5   Reset switch         J51 pins 19 &
  keylock                                                        20

  Speaker              J51 pins 7 -    32-bit VESA           SL1 - SL3
                            10         local bus slots

  Turbo LED            J51 pins 12 &
                            13

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Monitor type select color            JP32             Closed

      Monitor type select monochrome       JP32              Open

     CMOS memory normal operation         JP33        Pins 1 & 2 closed

      CMOS memory clear                    JP33        Pins 2 & 3 closed

     Factory configured - do not          JP74          Unidentified
      alter

     Factory configured - do not          JP75          Unidentified
      alter

     Factory configured - do not          JP76          Unidentified
      alter

     Factory configured - do not          JP77          Unidentified
      alter

     VL-BUS clock adjust normal           JP118       Pins 1 & 2 closed
      operation

      VL-BUS clock adjust reserved         JP118       Pins 2 & 3 closed

     Factory configured - do not          JP121         Unidentified
      alter

     Factory configured - do not          JP122       Pins 1 & 2 closed
      alter

     Factory configured - do not          JP123             Open
      alter

     Factory configured - do not          JP124             Open
      alter

     Factory configured - do not          JP125             Open
      alter

     Factory configured - do not           JXN        Pins 1 & 2 closed
      alter

              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) 4M x 9      (4) 1M x 9

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

      64MB        (4) 16M x 9        None

      80MB        (4) 16M x 9     (4) 4M x 9

     128MB        (4) 16M x 9    (4) 16M x 9

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     32KB        (4) 8K x 8        None       (1) 8K x 8

     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               JP5               JP7                JP58

      32KB              Open               Open        Pins 2 & 3 closed

      64KB             Closed              Open        Pins 1 & 2 closed

      128KB            Closed             Closed        Pins 1 & 2, 3 & 4
                                                             closed

      256KB            Closed             Closed        Pins 1 & 2, 4 & 5
                                                             closed

           CPU SPEED SELECTION

  Speed      JP34      JP35      JP36

  25MHz     Closed     Open     Closed

  33MHz     Closed    Closed     Open

  40MHz      Open      Open     Closed

  50iMHz    Closed     Open     Closed

  50MHz      Open     Closed     Open

  66iMHz    Closed    Closed     Open

                            CPU TYPE SELECTION

        Type               JP25            JP28              JP30

    CX486S (WB)           Closed           Open        Pins 5 & 6 closed

    CX486S (WT)           Closed           Open        Pins 5 & 6 closed

    CX486S2 (WB)          Closed           Open        Pins 5 & 6 closed

    CX486S2 (WT)          Closed           Open        Pins 5 & 6 closed

   80486SX (PQFP)          Open            Open              Open

   80486SX (PGA)          Closed           Open        Pins 5 & 6 closed

      80487SX             Closed           Open        Pins 1 & 2, 4 & 5,
                                                         6 & 7 closed

    CX486DX (WB)          Closed           Open        Pins 2 & 3, 4 & 5,
                                                         6 & 7 closed

    CX486DX (WT)          Closed           Open        Pins 2 & 3, 4 & 5,
                                                         6 & 7 closed

   CX486DX2 (WB)          Closed           Open        Pins 2 & 3, 4 & 5,
                                                         6 & 7 closed

   CX486DX2 (WT)          Closed           Open        Pins 2 & 3, 4 & 5,
                                                         6 & 7 closed

      80486DX             Closed           Open        Pins 2 & 3, 4 & 5,
                                                         6 & 7 closed

      80486DX2            Closed           Open        Pins 2 & 3, 4 & 5,
                                                         6 & 7 closed

        P24T              Closed           Open        Pins 1 & 2, 4 & 5,
                                                         6 & 7 closed

                        CPU TYPE SELECTION (CONT)

      Type           JP70           JP72          JP80           JP120

  CX486S (WB)     Pins 2 & 3     Pins 1 & 2     Pins 2 & 3       Open
                    closed         closed        closed

  CX486S (WT)     Pins 2 & 3     Pins 1 & 2     Pins 1 & 2       Open
                    closed         closed        closed

  CX486S2 (WB)    Pins 2 & 3     Pins 1 & 2     Pins 2 & 3      Closed
                    closed         closed        closed

  CX486S2 (WT)    Pins 2 & 3     Pins 1 & 2     Pins 1 & 2      Closed
                    closed         closed        closed

     80486SX      Pins 1 & 2     Pins 2 & 3     Pins 1 & 2       Open
     (PQFP)         closed         closed        closed

  80486SX (PGA)   Pins 1 & 2     Pins 2 & 3     Pins 1 & 2       Open
                    closed         closed        closed

    80487SX       Pins 1 & 2     Pins 2 & 3     Pins 1 & 2       Open
                    closed         closed        closed

  CX486DX (WB)    Pins 2 & 3     Pins 1 & 2     Pins 2 & 3       Open
                    closed         closed        closed

  CX486DX (WT)    Pins 2 & 3     Pins 1 & 2     Pins 1 & 2       Open
                    closed         closed        closed

  CX486DX2 (WB)   Pins 2 & 3     Pins 1 & 2     Pins 2 & 3      Closed
                    closed         closed        closed

  CX486DX2 (WT)   Pins 2 & 3     Pins 1 & 2     Pins 1 & 2      Closed
                    closed         closed        closed

    80486DX       Pins 1 & 2     Pins 2 & 3     Pins 1 & 2       Open
                    closed         closed        closed

    80486DX2      Pins 1 & 2     Pins 2 & 3     Pins 1 & 2       Open
                    closed         closed        closed

      P24T        Pins 1 & 2     Pins 2 & 3     Pins 1 & 2       Open
                    closed         closed        closed

