
ABIT COMPUTER CORPORATION

PV4/PV4T (REV. 1.1)

Processor  80486SX/SL80486SX/U5S/CX486DX/AM486DX/80486DX/SL80486DX/
           AM486DX2/AM486DX2V8T/CX486DX2/CX486DX2V/SL80486DX2/AM486DX4/ 80486DX4/Pentium
           Overdrive
Processor  25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Max.       128MB
Onboard
DRAM
Cache      128/256/512KB
BIOS       Award
Dimensions 254mm x 218mm
I/O        32-bit PCI slots (2), floppy drive interface, game port, green PC connector,
Options    IDE interfaces (2), parallel port, serial ports (2), VGA feature connector,
           VGA port
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                 Location

  IDE interface (primary)     CN1       Green PC connector        JP39

  IDE interface               CN2       Power LED & keylock       JW1
  (secondary)

  Floppy drive interface      CN3       Speaker                   JW2

  Parallel port               CN4       Turbo LED                 JW3

  Serial port 1                J3       Turbo switch              JW4

  Serial port 2                J4       Reset switch              JW5

  Game interface               J5       IDE interface LED         JW6

  External battery             J6       IDE interface LED         JW7

  VGA interface                J9       32-bit PCI slots        PC1 & PC2

  VGA feature connector       J10

                        USER CONFIGURABLE SETTINGS

                Function
                                             Jumper
                                                             Position

  
      Factory configured - do not
      alter
                                              J12
                                                               N/A

  
      Factory configured - do not
      alter
                                              JP5
                                                               N/A

  
      Factory configured - do not
      alter
                                              JP6
                                                               N/A

  
      Factory configured - do not
      alter
                                              JP36
                                                               N/A

  
      Factory configured - do not
      alter
                                              JP42
                                                            pins 2 & 3
                                                              closed

  
      Factory configured - do not
      alter
                                              JP43
                                                            pins 1 & 2
                                                              closed

  
      On board VGA enabled
                                              JP69
                                                            pins 2 & 3
                                                              closed


      On board VGA disabled
                                              JP69
                                                            pins 1 & 2
                                                              closed

  
      Factory configured - do not
      alter
                                              JP70
                                                               Open

  
      Factory configured - do not
      alter
                                              JP84
                                                               Open

  
      Factory configured - do not
      alter
                                              RN18
                                                               N/A

  
      Factory configured - do not
      alter
                                              RN19
                                                               N/A

  
      Factory configured - do not
      alter
                                              RN20
                                                               N/A

  
      Factory configured - do not
      alter
                                              RN21
                                                               N/A

                        DRAM CONFIGURATION

      Size            Bank 0           Bank 1          Bank 2

       1MB        (1) 256K x 36         NONE            NONE

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

       2MB        (1) 512K x 36         NONE            NONE

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

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

       4MB         (1) 1M x 36          NONE            NONE

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

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

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

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

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

       8MB         (1) 2M x 36          NONE            NONE

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

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

                    DRAM CONFIGURATION (CONT)

      Size
                      Bank 0
                                       Bank 1
                                                       Bank 2

      16MB
                   (1) 4M x 36
                                        NONE
                                                        NONE

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

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

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

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

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

      24MB
                   (1) 2M x 36
                                    (1) 2M x 36
                                                     (1) 2M x 36

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

      32MB
                   (1) 8M x 36
                                        NONE
                                                        NONE

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

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

      40MB
                   (1) 1M x 36
                                    (1) 1M x 36
                                                     (1) 8M x 36

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

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

      64MB
                   (1) 16M x 36
                                        NONE
                                                        NONE

      64MB
                   (1) 4M x 36
                                    (1) 4M x 36
                                                     (1) 8M x 36

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

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

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

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

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

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

      80MB
                   (1) 4M x 36
                                    (1) 8M x 36
                                                     (1) 8M x 36

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

      96MB
                   (1) 8M x 36
                                    (1) 8M x 36
                                                     (1) 8M x 36

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

              CACHE CONFIGURATION

      Size          Bank 0           TAG

     128KB        (4) 32K x 8    (1) 32K x 8

     256KB        (4) 64K x 8    (1) 32K x 8

     512KB        (4) 128K x 8   (1) 32K x 8

               CACHE JUMPER CONFIGURATION

            Size
                                       JP20

           128KB
                             pins 1 & 2, 4 & 5 closed

           256KB
                             pins 2 & 3, 4 & 5 closed

           512KB
                             pins 2 & 3, 5 & 6 closed

                          CPU TYPE CONFIGURATION

        Type              JP7          JP10         JP11          JP37

      80486SX            Open          Open       1 & 3, 2 &     1 & 2
                                                      4

     SL80486SX           Open          Open       1 & 3, 2 &      Open
                                                      4

        U5S              Open          Open       1 & 3, 2 &     1 & 2
                                                      4

      CX486DX            Open          Open       1 & 3, 2 &      Open
                                                      4

      AM486DX            Open          Open       1 & 3, 2 &     1 & 2
                                                      4

      80486DX            Open          Open       1 & 3, 2 &     1 & 2
                                                      4

     SL80486DX           Open          Open       1 & 3, 2 &      Open
                                                      4

      AM486DX2           Open          Open       1 & 3, 2 &     1 & 2
                                                      4

    AM486DX2V8T         Closed         Open       3 & 4, 5 &     1 & 2
                                                      6

      CX486DX2           Open          Open       1 & 3, 2 &      Open
                                                      4

     CX486DX2V           Open          Open       3 & 4, 5 &      Open
                                                      6

     SL80486DX2          Open          Open       1 & 3, 2 &      Open
                                                      4

      AM486DX4           Open          Open       3 & 5, 4 &     1 & 2
                                                      6

      80486DX4           Open          Open       3 & 5, 4 &      Open
                                                      6

  Pentium Overdrive      Open          Open       1 & 3, 2 &      Open
                                                      4

  Note: Pins designated should be in the closed position. The CX486DX2V,
  AM486DX4V8T & 80486DX4 are only available on the PV4T mainboard.

                      CPU TYPE CONFIGURATION (CONT)

      Type
                     RN1
                                    RN2
                                                  RN3
                                                                 RN4

    80486SX
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 9 - 16
                                                                closed

   SL80486SX
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 9 - 16
                                                                closed

      U5S
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 9 - 16
                                                                closed

    CX486DX
                      Not
                  installed
                                 pins 1 - 8
                                  closed
                                                   Not
                                               installed
                                                              pins 1 - 8
                                                                closed

    AM486DX
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 5 - 12
                                                                closed

    80486DX
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 5 - 12
                                                                closed

   SL80486DX
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 5 - 12
                                                                closed

    AM486DX2
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 5 - 12
                                                                closed

  AM486DX2V8T
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 5 - 12
                                                                closed

    CX486DX2
                      Not
                  installed
                                 pins 1 - 8
                                  closed
                                                   Not
                                               installed
                                                              pins 1 - 8
                                                                closed

   CX486DX2V
                      Not
                  installed
                                 pins 1 - 8
                                  closed
                                                   Not
                                               installed
                                                              pins 1 - 8
                                                                closed

   SL80486DX2
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 5 - 12
                                                                closed

    AM486DX4
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 5 - 12
                                                                closed

    80486DX4
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                              pins 5 - 12
                                                                closed

     Pentium
   Overdrive
                      Not
                  installed
                                    Not
                                 installed
                                                   Not
                                               installed
                                                                  Not
                                                              installed

  Note: The CX486DX2V, AM486DX4V8T & 80486DX4 are only available on the
  PV4T mainboard.

                      CPU TYPE CONFIGURATION (CONT)

       Type                RN5               RN6               RN7

      80486SX         Not installed     Not installed       pins 1 - 8
                                                              closed

     SL80486SX        Not installed     Not installed       pins 1 - 8
                                                              closed

        U5S           Not installed     Not installed       pins 1 - 8
                                                              closed

      CX486DX         Not installed       pins 1 - 8      Not installed
                                           closed

      AM486DX         Not installed       pins 1 - 8        pins 1 - 8
                                           closed             closed

      80486DX         Not installed       pins 1 - 8        pins 1 - 8
                                           closed             closed

     SL80486DX        Not installed       pins 1 - 8        pins 1 - 8
                                           closed             closed

     AM486DX2         Not installed       pins 1 - 8        pins 1 - 8
                                           closed             closed

    AM486DX2V8T       Not installed       pins 1 - 8        pins 1 - 8
                                           closed             closed

     CX486DX2         Not installed       pins 1 - 8      Not installed
                                           closed

     CX486DX2V        Not installed       pins 1 - 8      Not installed
                                           closed

    SL80486DX2        Not installed       pins 1 - 8        pins 1 - 8
                                           closed             closed

     AM486DX4         Not installed       pins 1 - 8        pins 1 - 8
                                           closed             closed

     80486DX4         Not installed       pins 1 - 8        pins 1 - 8
                                           closed             closed

      Pentium          pins 7 & 16        pins 2 & 3        pins 1 & 2
     Overdrive           closed            closed             closed

  Note: The CX486DX2V, AM486DX4V8T & 80486DX4 are only available on the
  PV4T mainboard.

                          CPU SPEED CONFIGURATION

     Speed
                     JP32
                                    JP33
                                                  JP34
                                                                 JP35

     25MHz
                  pins 1 & 2
                    closed
                                    Open
                                                  Open
                                                                Closed

     33MHz
                  pins 1 & 2
                    closed
                                   Closed
                                                 Closed
                                                                Closed

     40MHz
                  pins 1 & 2
                    closed
                                    Open
                                                 Closed
                                                                Closed

    50iMHz
                  pins 1 & 2
                    closed
                                    Open
                                                  Open
                                                                Closed

    66iMHz
                  pins 1 & 2
                    closed
                                   Closed
                                                 Closed
                                                                Closed

    75iMHz
                  pins 1 & 2
                    closed
                                    Open
                                                  Open
                                                                Closed

    80iMHz
                  pins 1 & 2
                    closed
                                    Open
                                                 Closed
                                                                Closed

    100iMHz
                  pins 1 & 2
                    closed
                                   Closed
                                                 Closed
                                                                Closed

              CPU VOLTAGE CONFIGURATION

  Voltage     JP1        JP2        JP3        JP4

   3.3v      Closed      Open      Open       Open

   3.45v      Open      Closed     Open       Open

   3.6v       Open       Open     Closed      Open

   4.04v      Open       Open      Open      Closed

                            CMOS CONFIGURATION

          Setting
                                    JP60
                                                            JP80

     CMOS memory normal
         operation
                              pins 1 & 2 closed
                                                      pins 1 & 2 closed

     CMOS memory clear
                              pins 2 & 3 closed
                                                      pins 2 & 3 closed

