
ABIT COMPUTER CORPORATION

PW4/PW4T REV. 1.3

Processor  80486SX/SL80486SX/CX486M7/AM486DX/80486DX/SL80486DX/CX486DX2/
           AM486DX2/80486DX2/SL80486DX2/AM486DX4/80486DX4
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/100(internal)MHz
Speed
Chip Set   Unidentifed
Max.       192MB
Onboard
DRAM
Cache      128/256/512/1024KB
BIOS       Award
Dimensions 330mm x 218mm
I/O        32-bit VESA local bus slots (3), green PC connector
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                 Location

  External battery             J1       Power LED & keylock       JW1

  Green PC connector          JP47      Speaker                   JW2

  Green PC connector          JP48      Turbo LED                 JW3

  Green PC connector          JP49      Turbo switch              JW4

  Green PC connector          JP50      Reset switch              JW5

  Green PC connector          JP51      32-bit VESA local      SL1 - SL3
                                        bus slots

  Green PC connector          JP52

                        USER CONFIGURABLE SETTINGS

                Function
                                             Jumper
                                                             Position

  
      Monitor type select color
                                              JP5
                                                              Closed


      Monitor type select monochrome
                                              JP5
                                                               Open

  
      Factory configured - do not
      alter
                                              JP6
                                                               Open

  
      Factory configured - do not
      alter
                                              JP41
                                                               Open

  
      CMOS memory normal operation
                                              JP67
                                                            pins 1 & 2
                                                              closed


      CMOS memory clear
                                              JP67
                                                            pins 2 & 3
                                                              closed

                        DRAM CONFIGURATION

      Size            Bank 0           Bank 1          Bank 2

       1MB         (4) 256K x 9         NONE            NONE

       1MB             NONE        (1) 256K x 36        NONE

       1MB             NONE             NONE        (1) 256K x 36

       2MB         (4) 256K x 9    (1) 256K x 36        NONE

       2MB         (4) 256K x 9    (1) 256K x 36        NONE

       2MB             NONE        (1) 256K x 36    (1) 256K x 36

       2MB             NONE        (1) 512K x 36        NONE

       2MB             NONE             NONE        (1) 512K x 36

       3MB         (4) 256K x 9    (1) 512K x 36        NONE

       3MB         (4) 256K x 9    (1) 256K x 36    (1) 256K x 36

       3MB         (4) 256K x 9    (1) 512K x 36        NONE

       3MB             NONE        (1) 256K x 36    (1) 512K x 36

       4MB          (4) 1M x 9          NONE            NONE

       4MB             NONE         (1) 1M x 36         NONE

       4MB             NONE        (1) 512K x 36    (1) 512K x 36

       4MB             NONE             NONE         (1) 1M x 36

       5MB         (4) 256K x 9     (1) 1M x 36         NONE

       5MB          (4) 1M x 9     (1) 256K x 36        NONE

       5MB          (4) 1M x 9     (1) 256K x 36        NONE

       5MB         (4) 256K x 9    (1) 512K x 36    (1) 512K x 36

       5MB             NONE        (1) 256K x 36     (1) 1M x 36

       6MB          (4) 1M x 9     (1) 512K x 36        NONE

       6MB          (4) 1M x 9     (1) 256K x 36    (1) 256K x 36

       6MB         (4) 256K x 9    (1) 256K x 36     (1) 1M x 36

       6MB          (4) 1M x 9     (1) 512K x 36        NONE

       6MB             NONE         (1) 1M x 36     (1) 512K x 36

       8MB          (4) 1M x 9      (1) 1M x 36         NONE

       8MB          (4) 1M x 9     (1) 512K x 36    (1) 512K x 36

       8MB             NONE         (1) 2M x 36         NONE

       8MB             NONE             NONE         (1) 2M x 36

       9MB          (4) 1M x 9     (1) 256K x 36     (1) 1M x 36

       9MB         (4) 256K x 9     (1) 1M x 36      (1) 1M x 36

       9MB         (4) 256K x 9     (1) 2M x 36         NONE

      11MB         (4) 256K x 9    (1) 512K x 36     (1) 2M x 36

      12MB          (4) 1M x 9      (1) 2M x 36         NONE

                    DRAM CONFIGURATION (CONT)

      Size
                      Bank 0
                                       Bank 1
                                                       Bank 2

      12MB
                    (4) 1M x 9
                                    (1) 1M x 36
                                                     (1) 1M x 36

      12MB
                    (4) 1M x 9
                                    (1) 2M x 36
                                                        NONE

      12MB
                       NONE
                                    (1) 1M x 36
                                                     (1) 2M x 36

      16MB
                    (4) 4M x 9
                                        NONE
                                                        NONE

      16MB
                       NONE
                                    (1) 4M x 36
                                                        NONE

      16MB
                       NONE
                                    (1) 2M x 36
                                                     (1) 2M x 36

      16MB
                       NONE
                                        NONE
                                                     (1) 4M x 36

      17MB
                   (4) 256K x 9
                                    (1) 4M x 36
                                                        NONE

      17MB
                    (4) 4M x 9
                                   (1) 256K x 36
                                                        NONE

      17MB
                   (4) 256K x 9
                                    (1) 2M x 36
                                                     (1) 2M x 36

      17MB
                       NONE
                                   (1) 256K x 36
                                                     (1) 4M x 36

      18MB
                    (4) 4M x 9
                                   (1) 512K x 36
                                                        NONE

      18MB
                    (4) 4M x 9
                                   (1) 256K x 36
                                                    (1) 256K x 36

      18MB
                   (4) 256K x 9
                                   (1) 256K x 36
                                                     (1) 4M x 36

      18MB
                    (4) 4M x 9
                                   (1) 512K x 36
                                                        NONE

      18MB
                       NONE
                                    (1) 4M x 36
                                                    (1) 512K x 36

      20MB
                    (4) 1M x 9
                                    (1) 4M x 36
                                                        NONE

      20MB
                    (4) 4M x 9
                                    (1) 1M x 36
                                                        NONE

      20MB
                    (4) 1M x 9
                                    (1) 2M x 36
                                                     (1) 2M x 36

      20MB
                    (4) 4M x 9
                                   (1) 512K x 36
                                                    (1) 512K x 36

      20MB
                       NONE
                                    (1) 1M x 36
                                                     (1) 4M x 36

      21MB
                    (4) 4M x 9
                                   (1) 256K x 36
                                                     (1) 1M x 36

      21MB
                    (4) 1M x 9
                                   (1) 256K x 36
                                                     (1) 4M x 36

      21MB
                   (4) 256K x 9
                                    (1) 1M x 36
                                                     (1) 4M x 36

      24MB
                    (4) 4M x 9
                                    (1) 2M x 36
                                                        NONE

      24MB
                    (4) 4M x 9
                                    (1) 1M x 36
                                                     (1) 1M x 36

      24MB
                    (4) 1M x 9
                                    (1) 1M x 36
                                                     (1) 4M x 36

      24MB
                    (4) 4M x 9
                                    (1) 2M x 36
                                                        NONE

      24MB
                       NONE
                                    (1) 4M x 36
                                                     (1) 2M x 36

      32MB
                    (4) 4M x 9
                                    (1) 4M x 36
                                                        NONE

      32MB
                    (4) 4M x 9
                                    (1) 2M x 36
                                                     (1) 2M x 36

      32MB
                       NONE
                                    (1) 4M x 36
                                                     (1) 4M x 36

      32MB
                       NONE
                                    (1) 8M x 36
                                                        NONE

      32MB
                       NONE
                                        NONE
                                                     (1) 8M x 36

      33MB
                   (4) 256K x 9
                                    (1) 8M x 36
                                                        NONE

      33MB
                    (4) 4M x 9
                                   (1) 256K x 36
                                                     (1) 4M x 36

      33MB
                   (4) 256K x 9
                                    (1) 4M x 36
                                                     (1) 4M x 36

      33MB
                   (4) 256K x 9
                                    (1) 8M x 36
                                                        NONE

      33MB
                       NONE
                                   (1) 256K x 36
                                                     (1) 8M x 36

      34MB
                       NONE
                                   (1) 512K x 36
                                                     (1) 8M x 36

      35MB
                   (4) 256K x 9
                                   (1) 512K x 36
                                                     (1) 8M x 36

      36MB
                    (4) 1M x 9
                                    (1) 8M x 36
                                                        NONE

      36MB
                    (4) 4M x 9
                                    (1) 1M x 36
                                                     (1) 4M x 36

      36MB
                    (4) 1M x 9
                                    (1) 4M x 36
                                                     (1) 4M x 36

                    DRAM CONFIGURATION (CONT)

      Size            Bank 0           Bank 1          Bank 2

      36MB          (4) 1M x 9      (1) 8M x 36         NONE

      36MB             NONE         (1) 1M x 36      (1) 8M x 36

      38MB          (4) 1M x 9     (1) 512K x 36     (1) 8M x 36

      40MB             NONE         (1) 2M x 36      (1) 8M x 36

      41MB         (4) 256K x 9     (1) 2M x 36      (1) 8M x 36

      44MB          (4) 1M x 9      (1) 2M x 36      (1) 8M x 36

      48MB          (4) 4M x 9      (1) 8M x 36         NONE

      48MB          (4) 4M x 9      (1) 4M x 36      (1) 4M x 36

      48MB             NONE         (1) 4M x 36      (1) 8M x 36

      56MB          (4) 4M x 9      (1) 2M x 36      (1) 8M x 36

      64MB         (4) 16M x 9          NONE            NONE

      64MB             NONE         (1) 16M x 36        NONE

      64MB             NONE         (1) 8M x 36      (1) 8M x 36

      64MB             NONE             NONE        (1) 16M x 36

      65MB         (4) 256K x 9     (1) 16M x 36        NONE

      65MB         (4) 16M x 9     (1) 256K x 36        NONE

      65MB         (4) 16M x 9     (1) 256K x 36        NONE

      65MB         (4) 256K x 9     (1) 8M x 36      (1) 8M x 36

      65MB             NONE        (1) 256K x 36    (1) 16M x 36

      66MB         (4) 16M x 9     (1) 512K x 36        NONE

      66MB         (4) 16M x 9     (1) 256K x 36    (1) 256K x 36

      66MB         (4) 256K x 9    (1) 256K x 36    (1) 16M x 36

      66MB         (4) 16M x 9     (1) 512K x 36        NONE

      66MB             NONE         (1) 16M x 36    (1) 512K x 36

      68MB          (4) 1M x 9      (1) 16M x 36        NONE

      68MB         (4) 16M x 9      (1) 1M x 36         NONE

      68MB          (4) 1M x 9      (1) 8M x 36      (1) 8M x 36

      68MB         (4) 16M x 9     (1) 512K x 36    (1) 512K x 36

      68MB             NONE         (1) 1M x 36     (1) 16M x 36

      69MB         (4) 16M x 9     (1) 256K x 36     (1) 1M x 36

      69MB          (4) 1M x 9     (1) 256K x 36    (1) 16M x 36

      69MB         (4) 256K x 9     (1) 1M x 36     (1) 16M x 36

      72MB         (4) 16M x 9      (1) 2M x 36         NONE

      72MB         (4) 16M x 9      (1) 1M x 36      (1) 1M x 36

      72MB          (4) 1M x 9      (1) 1M x 36     (1) 16M x 36

      72MB         (4) 16M x 9      (1) 2M x 36         NONE

      72MB             NONE         (1) 16M x 36     (1) 2M x 36

      74MB         (4) 16M x 9     (1) 512K x 36     (1) 2M x 36

      80MB          (4) 4M x 9      (1) 16M x 36        NONE

      80MB         (4) 16M x 9      (1) 4M x 36         NONE

      80MB         (4) 16M x 9      (1) 2M x 36      (1) 2M x 36

      81MB         (4) 16M x 9     (1) 256K x 36     (1) 4M x 36

      81MB          (4) 4M x 9     (1) 256K x 36    (1) 16M x 36

      81MB         (4) 256K x 9     (1) 4M x 36     (1) 16M x 36

                    DRAM CONFIGURATION (CONT)

      Size
                      Bank 0
                                       Bank 1
                                                       Bank 2

      84MB
                   (4) 16M x 9
                                    (1) 1M x 36
                                                     (1) 4M x 36

      84MB
                    (4) 4M x 9
                                    (1) 1M x 36
                                                    (1) 16M x 36

      84MB
                    (4) 1M x 9
                                    (1) 4M x 36
                                                    (1) 16M x 36

      96MB
                   (4) 16M x 9
                                    (1) 8M x 36
                                                        NONE

      96MB
                    (4) 4M x 9
                                    (1) 4M x 36
                                                    (1) 16M x 36

      96MB
                       NONE
                                    (1) 16M x 36
                                                     (1) 8M x 36

      128MB
                   (4) 16M x 9
                                    (1) 16M x 36
                                                        NONE

      128MB
                   (4) 16M x 9
                                    (1) 8M x 36
                                                     (1) 8M x 36

      128MB
                       NONE
                                    (1) 16M x 36
                                                    (1) 16M x 36

      129MB
                   (4) 16M x 9
                                   (1) 256K x 36
                                                    (1) 16M x 36

      129MB
                   (4) 256K x 9
                                    (1) 16M x 36
                                                    (1) 16M x 36

      132MB
                   (4) 16M x 9
                                    (1) 1M x 36
                                                    (1) 16M x 36

      132MB
                    (4) 1M x 9
                                    (1) 16M x 36
                                                    (1) 16M x 36

      144MB
                   (4) 16M x 9
                                    (1) 4M x 36
                                                    (1) 16M x 36

      144MB
                    (4) 4M x 9
                                    (1) 16M x 36
                                                    (1) 16M x 36

      192MB
                   (4) 16M x 9
                                    (1) 16M x 36
                                                    (1) 16M x 36

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

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

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

     256KB        (4) 64K x 8        NONE        (1) 64K x 8

     512KB        (4) 64K x 8     (4) 64K x 8    (1) 64K x 8

     512KB       (4) 128K x 8        NONE        (1) 128K x 8

      1MB        (4) 128K x 8    (4) 128K x 8    (1) 128K x 8

                        CACHE JUMPER CONFIGURATION

    Size
                  JP60
                                 JP61
                                                JP62
                                                                JPX3

   128KB
               pins 2 & 3
                 closed
                              pins 1 & 2
                                closed
                                              pins 2 & 3
                                               closed
                                                             pins 9 - 16
                                                               closed

   256KB
               pins 2 & 3
                 closed
                              pins 1 & 2
                                closed
                                              pins 2 & 3
                                               closed
                                                             pins 13 - 20
                                                               closed

   256KB
               pins 2 & 3
                 closed
                              pins 2 & 3
                                closed
                                              pins 2 & 3
                                               closed
                                                             pins 3 - 10
                                                               closed

   512KB
               pins 2 & 3
                 closed
                              pins 1 & 2
                                closed
                                              pins 2 & 3
                                               closed
                                                              pins 1 - 8
                                                               closed

   512KB
               pins 2 & 3
                 closed
                              pins 1 & 2
                                closed
                                              pins 2 & 3
                                               closed
                                                             pins 3 - 10
                                                               closed

    1MB
               pins 1 & 2
                 closed
                              pins 1 & 2
                                closed
                                              pins 1 & 2
                                               closed
                                                              pins 1 - 8
                                                               closed

                          CPU TYPE CONFIGURATION

       Type            JP15          JP16          JP17          JP37

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

     SL80486SX         Open        pins 2 & 3   pins 2 & 3       Open
                                    closed        closed

      CX486M7          Open        pins 1 & 2   pins 1 & 2       Open
                                    closed        closed

      AM486DX          Open        pins 2 & 3   pins 2 & 3       Open
                                    closed        closed

      80486DX          Open        pins 2 & 3   pins 2 & 3       Open
                                    closed        closed

     SL80486DX         Open        pins 2 & 3   pins 2 & 3       Open
                                    closed        closed

    CX486DX2-50        Open        pins 2 & 3   pins 2 & 3       1 & 2
                                    closed        closed

    CX486DX2-66        Open        pins 1 & 2   pins 1 & 2       Open
                                    closed        closed

    CX486DX2-80        Open        pins 1 & 2   pins 1 & 2       Open
                                    closed        closed

  AM486DX2 (3.45v)   pins 2 & 3    pins 2 & 3   pins 2 & 3       Open
                      closed        closed        closed

     AM486DX2          Open        pins 2 & 3   pins 2 & 3       Open
                                    closed        closed

     80486DX2          Open        pins 2 & 3   pins 2 & 3       Open
                                    closed        closed

    SL80486DX2         Open        pins 2 & 3   pins 2 & 3       Open
                                    closed        closed

     AM486DX4          Open        pins 1 & 2   pins 1 & 2       Open
                                    closed        closed

    80486DX4-75        Open        pins 2 & 3   pins 2 & 3     pins 1 & 2
                                    closed        closed        closed

   80486DX4-100        Open        pins 2 & 3   pins 2 & 3       Open
                                    closed        closed

  Note: DX4 CPU is only available on the PW4T mainboard.

                          CPU TYPE CONFIGURATION

        Type
                        JP38
                                    JP39
                                                JP40
                                                                RN8

      80486SX
                        Open
                                    Open
                                                Open
                                                             Installed

     SL80486SX
                        Open
                                    Open
                                                Open
                                                             Installed

      CX486M7
                        Open
                                    Open
                                                Open
                                                             Installed

      AM486DX
                        Open
                                    Open
                                                Open
                                                             Installed

      80486DX
                        Open
                                    Open
                                                Open
                                                             Installed

     SL80486DX
                        Open
                                    Open
                                                Open
                                                             Installed

    CX486DX2-50
                        Open
                                    Open
                                                Open
                                                           Not installed

    CX486DX2-66
                        Open
                                   1 & 2
                                                Open
                                                           Not installed

    CX486DX2-80
                        Open
                                    Open
                                               1 & 2
                                                           Not installed

  AM486DX2 (3.45v)
                       1 & 2
                                    Open
                                                Open
                                                           Not installed

      AM486DX2
                        Open
                                    Open
                                                Open
                                                             Installed

      80486DX2
                        Open
                                    Open
                                                Open
                                                             Installed

     SL80486DX2
                        Open
                                    Open
                                                Open
                                                             Installed

      AM486DX4
                       1 & 2
                                    Open
                                               1 & 2
                                                           Not installed

    80486DX4-75
                        Open
                                    Open
                                                Open
                                                           Not installed

    80486DX4-100
                       1 & 2
                                    Open
                                               1 & 2
                                                           Not installed

  Note: Pins designated should be in the closed position. DX4 CPU is only
  available on the PW4T mainboard.

                          CPU TYPE CONFIGURATION

     Type          RN5           RN6           RN7         JP20     JP26

   80486SX          Not       Installed         Not       Closed    1 & 2
                installed                   installed

  SL80486SX         Not       Installed         Not       Closed    1 & 2
                installed                   installed

   CX486M7      Installed         Not       Installed      Open     1 & 2
                              installed

   AM486DX          Not       Installed     Installed      Open     1 & 2
                installed

   80486DX          Not       Installed     Installed      Open     1 & 2
                installed

  SL80486DX         Not       Installed     Installed      Open     1 & 2
                installed

   AM486DX2         Not       Installed     Installed      Open     1 & 2
                installed

   80486DX2         Not       Installed     Installed      Open     1 & 2
                installed

  SL80486DX2        Not       Installed     Installed      Open     1 & 2
                installed

   AM486DX4         Not       Installed     Installed      Open     Open
                installed

   80486DX4         Not       Installed     Installed      Open     Open
                installed

  Note: Pins designated should be in the closed position. DX4 CPU is only
  available on the PW4T mainboard.

                      CPU TYPE CONFIGURATION (CONT)

       Type
                      JP42
                                    JP65
                                                  JPX1
                                                                 JPX2

     80486SX
                      Open
                                    Open
                                               pins 5 - 12
                                                 closed
                                                                 Open

    SL80486SX
                     Closed
                                    Open
                                               pins 5 - 12
                                                 closed
                                                                 Open

     CX486M7
                     Closed
                                   Closed
                                               pins 1 - 8
                                                 closed
                                                              pins 1 - 8
                                                                closed

     AM486DX
                      Open
                                   Closed
                                               pins 5 - 12
                                                 closed
                                                                 Open

     80486DX
                      Open
                                   Closed
                                               pins 5 - 12
                                                 closed
                                                                 Open

    SL80486DX
                     Closed
                                   Closed
                                               pins 5 - 12
                                                 closed
                                                                 Open

     AM486DX2
                      Open
                                   Closed
                                               pins 5 - 12
                                                 closed
                                                                 Open

     80486DX2
                      Open
                                   Closed
                                               pins 5 - 12
                                                 closed
                                                                 Open

    SL80486DX2
                     Closed
                                   Closed
                                               pins 5 - 12
                                                 closed
                                                                 Open

     AM486DX4
                     Closed
                                   Closed
                                               pins 5 - 12
                                                 closed
                                                                 Open

     80486DX4
                     Closed
                                   Closed
                                               pins 5 - 12
                                                 closed
                                                                 Open

  Note: DX4 CPU is only available on the PW4T mainboard.

  CPU SPEED CONFIGURATION(U30 CLOCK GENERATOR)

   Speed        JP27        JP28         JP29

   20MHz        Open        Open        Closed

   25MHz       Closed       Open        Closed

   33MHz        Open       Closed       Closed

   40MHz       Closed       Open         Open

   50iMHz      Closed       Open        Closed

   66iMHz       Open       Closed       Closed

   75iMHz      Closed       Open        Closed

   80iMHz      Closed       Open         Open

  100iMHz       Open       Closed       Closed

  CPU SPEED CONFIGURATION(U31 CLOCK GENERATOR)

   Speed
                JP27
                            JP28
                                         JP29

   20MHz
                Open
                            Open
                                         Open

   25MHz
                Open
                            Open
                                        Closed

   33MHz
               Closed
                           Closed
                                        Closed

   40MHz
                Open
                           Closed
                                        Closed

   50iMHz
                Open
                            Open
                                        Closed

   66iMHz
               Closed
                           Closed
                                        Closed

   75iMHz
                Open
                            Open
                                        Closed

   80iMHz
                Open
                           Closed
                                        Closed

  100iMHz
               Closed
                           Closed
                                        Closed

  VESA WAIT STATE CONFIGURATION

   Wait states          JP9

  0 wait states        Open

  1 wait state        Closed

  BUS SPEED CONFIGURATION

  CPU speed
                   JP10

   <= 33MHz
                   Open

   > 33MHz
                  Closed

