
PACKARD BELL

PB400 (4MB)

Processor       80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed 16/20/25/33/50(internal)/66(internal)MHz
Chip Set        OPTI
Max. onboard    20MB
DRAM
SRAM Cache      64/128/256KB
BIOS            Phoenix
Dimensions      330mm x 218mm
I/O Options     Fax/modem daughterboard, floppy drive interface, game
                port, IDE interface, multi-function connector (IDE
                interface LED, keylock, reset, SW_MODLR, Turbo LED),
                parallel port, PS/2 keyboard port, PS/2 mouse port, serial
                port, VGA feature connector, VGA port
NPU Options     None

[Image]

                                CONNECTIONS

  Purpose               Location     Purpose                   Location

  PS/2 keyboard            J1        Keylock                      J19

  PS/2 mouse               J2        Fax/modem                    J21
                                     daughterboard

  VGA port                 J3        IDE interface                J25

  Game port                J4        Floppy drive interface       J27

  Parallel port            J5        External speaker             J28
                                     connector

  Serial port B            J6        Multi-function               J32
                                     connector

  External battery         J7        CPU/chassis fan power        J33
                                     (+12VDC)

  VGA feature             J13        Riser card                   S1
  connector

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

     Internal battery enabled                  J8            Closed

      Internal battery disabled                 J8             Open

     Onboard Game port enabled                J12           pins 2 & 3
                                                              closed

      Onboard Game port disabled               J12           pins 1 & 2
                                                              closed

     Monitor type select color                J16            Closed

      Monitor type select monochrome           J16             Open

     PS/2 mouse port enabled                  J17            Closed

      PS/2 mouse port disabled                 J17             Open

     Onboard IDE interface enabled            J24           pins 1 & 2
                                                              closed

      Onboard IDE interface disabled           J24           pins 2 & 3
                                                              closed

     Onboard floppy drive interface           J26           pins 1 & 2
      enabled                                                 closed

      Onboard floppy drive interface           J26           pins 2 & 3
      disabled                                                closed

     Onboard speaker enabled                  J29           pins 1 & 2
                                                              closed

      Onboard speaker disabled                 J29           pins 2 & 3
                                                              closed

                            DRAM CONFIGURATION

   Size       Bank 0      Parity 0      Bank 1      Parity 1      Bank 2

   4MB      (2) 441000   (1) 411000    (2) 441000   (1) 411000     None

   5MB      (2) 441000   (1) 411000    (2) 441000   (1) 411000   (4) 256K
                                                                   x 9

   8MB      (2) 441000   (1) 411000    (2) 441000   (1) 411000   (4) 1M x
                                                                    9

   20MB     (2) 441000   (1) 411000    (2) 441000   (1) 411000   (4) 4M x
                                                                    9

  Note:Bank 0 and 1 are soldered to the board. Locations of Parity 0 and
  1 are unknown.

                            VIDEO CONFIGURATION

           Mode                      J10                     J14

       VGA port (J3)          pins 1 & 2 closed            Closed

   VGA feature connector      pins 1 & 2 closed             Open
           (J13)

         Disabled             pins 2 & 3 closed              N/A

                            VRAM CONFIGURATION

          Size                    Bank 0                   Bank 1

          512KB                 (4) 44256                   None

         1024KB                 (4) 44256                (4) 44256

  Note: If Bank 1 sockets are omitted from board, board was factory
  installed with 1MB of VRAM. Bank 0 is soldered to the board.

                         SERIAL PORT CONFIGURATION

  Modem (J21)    Port B     ISA Modem     J18       J20      J101/JMOD *
                  (J5)

   Disabled       COM2        None        N/A      pins 1      Closed
                                                    & 2

   Disabled       COM2        COM1       pins 2    pins 1      Closed
                                          & 3       & 2

   Disabled       COM2        COM3       pins 1    pins 1      Closed
                                          & 2       & 2

     COM1         COM2        None       pins 1    pins 1       Open
                                          & 2       & 2

     COM3         COM2        None       pins 2    pins 1       Open
                                          & 3       & 2

   Disabled       COM4        None        N/A      pins 2      Closed
                                                    & 3

   Disabled       COM4        COM1       pins 2    pins 2      Closed
                                          & 3       & 3

   Disabled       COM4        COM3       pins 1    pins 2      Closed
                                          & 2       & 3

     COM1         COM4        None       pins 1    pins 2       Open
                                          & 2       & 3

     COM3         COM4        None       pins 2    pins 2       Open
                                          & 3       & 3

  Note:* JMOD is a special block placed on J21 itself, connecting pins 10
  and 11 together diagonally. Permanent damage to the board will occur if
  the JMOD jumper is installed improperly.

  Boards with J101 do not use the JMOD jumper (J101 is a direct
  replacement for JMOD).

  Pins designated should be in the closed position.

                        PARALLEL PORT CONFIGURATION

         LPT               IRQ               J22                J23

          LPT1            IRQ7           pins 1 & 2         pins 1 & 2
                                           closed             closed

           LPT1            IRQ5           pins 1 & 2         pins 2 & 3
                                           closed             closed

           LPT2            IRQ7           pins 2 & 3         pins 1 & 2
                                           closed             closed

           LPT2            IRQ5           pins 2 & 3         pins 2 & 3
                                           closed             closed

                          CPU TYPE CONFIGURATION

    CPU      J30/1    J30/3    J30/5    J30/7   J30/9&10    J31      J34
              & 2     & 4      & 6      & 8

  80486SX    Open    Closed    Open     Open      Open     Open     Open

  80487SX    Closed   Open    Closed    Open     Closed    Open     Open

  80486DX    Closed   Open    Closed   Closed     Open     Open     Open

  ODP486SX   Closed   Open    Closed   Closed     Open     Closed   Closed

  80486DX2   Closed   Open    Closed   Closed     Open     Open     Closed

               CPU SPEED CONFIGURATION

      Speed         J35/pins 1 & 2   J35/pins 3 & 4

      16MHz            Closed            Closed

      20MHz             Open             Closed

      25MHz            Closed             Open

      33MHz             Open              Open

                            CACHE CONFIGURATION

     Size         Bank 0        Bank 1       TAG (U81)        Dirty Bit
                                                                (U84)

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

     128KB      (4) 32K x 8      NONE       (1) 32K x 8      (1) 64K x 1

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

                        CACHE JUMPER CONFIGURATION

       Size         J36/1 &    J36/3 &     J36/5 &    J36/7 &     J36/9 &
                       2          4          6           8          10

      Disabled      Open       Open        Open       Open        Open

         64KB        Open       Open        Open       Open        Open

        128KB       Closed      Open       Closed     Closed       Open

        256KB       Closed     Closed      Closed      Open       Closed

