
UNIDENTIFIED

486 VESA (REV. VL 421A/422)

Processor              CX486S/80486SX/80487SX/80486DX/80486DX2/P24T
Processor Speed        20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set               Forex
Video Chip Set         None
Maximum Onboard Memory 36MB
Maximum Video Memory   None
Cache                  64/128/256KB
BIOS                   AMI
Dimensions             330mm x 218mm
I/O Options            32-bit VESA local bus slots (2)
NPU Options            None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            JP2       Turbo switch              JP15

  Reset switch                JP3       Turbo LED                 JP16

  Power LED & keylock         JP9       32-bit VESA local      SL1 & SL2
                                        bus slots

  Speaker                    JP10

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

      Battery type select internal          JP2        Pins 1 & 2 closed

      Battery type select external          JP2             Closed

     Factory configured - do not           JP5          Unidentified
      alter

     Factory configured - do not           JP6          Unidentified
      alter (CMOS)

                      DRAM CONFIGURATION

      Size          Bank 0          Bank 1          Bank 2

      1MB            None        (4) 256K x 9        None

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

      4MB         (8) 411000         None            None

      4MB            None         (4) 1M x 9         None

      5MB         (8) 411000     (4) 256K x 9        None

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

      8MB         (8) 411000      (4) 1M x 9         None

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

      12MB        (8) 411000      (4) 1M x 9      (4) 1M x 9

      16MB           None         (4) 4M x 9         None

      20MB        (8) 411000      (4) 4M x 9         None

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

      36MB        (8) 411000      (4) 4M x 9      (4) 4M x 9

  Note: The location of banks 1 & 2 are unidentified.

             DRAM JUMPER SELECTION

        Setting                  JP105

  DIPPs used as bank 0     Pins 1 & 2 closed

  SIMMs used as bank 0     Pins 2 & 3 closed

                    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          JP8A            JP8B           JP8D           JP8E

    64KB        Pins 2 & 3     Pins 2 & 3     Pins 2 & 3      Pins 2 & 3
                 closed          closed         closed         closed

    128KB       Pins 1 & 2     Pins 1 & 2     Pins 1 & 2      Pins 1 & 2
                 closed          closed         closed         closed

    256KB       Pins 2 & 3     Pins 1 & 2     Pins 2 & 3      Pins 1 & 2
                 closed          closed         closed         closed

                            CPU SPEED SELECTION

      Speed              JP7A              JP7B               JP7C

      20MHz           Pins 2 & 3         Pins 1 & 2         Pins 1 & 2
                        closed            closed             closed

      25MHz           Pins 1 & 2         Pins 2 & 3         Pins 1 & 2
                        closed            closed             closed

      33MHz           Pins 1 & 2         Pins 1 & 2         Pins 2 & 3
                        closed            closed             closed

      40MHz           Pins 2 & 3         Pins 2 & 3         Pins 1 & 2
                        closed            closed             closed

      50iMHz          Pins 1 & 2         Pins 2 & 3         Pins 1 & 2
                        closed            closed             closed

      50MHz           Pins 2 & 3         Pins 1 & 2         Pins 2 & 3
                        closed            closed             closed

      66iMHz          Pins 1 & 2         Pins 1 & 2         Pins 2 & 3
                        closed            closed             closed

                            CPU TYPE SELECTION

       Type               JP12              JP13               JP29

      CX486S              N/A                N/A               N/A

   80486 (PQFP)        Pins 2 & 3         Pins 2 & 3        Pins 2 & 3
                         closed            closed             closed

      80486SX          Pins 2 & 3         Pins 2 & 3        Pins 2 & 3
                         closed            closed             closed

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

      80486DX          Pins 1 & 2         Pins 1 & 2        Pins 1 & 2
                         closed            closed             closed

     80486DX2          Pins 1 & 2         Pins 1 & 2        Pins 1 & 2
                         closed            closed             closed

       P24T               N/A                N/A               N/A

                        CPU TYPE SELECTION (CONT)

      Type           JP30          JP104         JP109          JP110

     CX486S          N/A            N/A           N/A         Pins 1 & 2
                                                                closed

  80486 (PQFP)    Pins 2 & 3        N/A           N/A            N/A
                    closed

    80486SX       Pins 2 & 3        N/A           N/A            N/A
                    closed

    80487SX       Pins 2 & 3        N/A           N/A            N/A
                    closed

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

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

      P24T           N/A         Pins 2 & 3    Pins 2 & 3        N/A
                                  closed         closed

                 VL BUS WAIT STATE SELECTION

       Setting              JP102                JP103

          0            Pins 1 & 2 closed   Pins 1 & 2 closed

          1            Pins 2 & 3 closed   Pins 2 & 3 closed

