
IBM CORPORATION

PC 330-486, PC 350-486

Processor     80486SX/486 Overdrive/80486DX/80486DX2/80486DX4/P24T
Processor     20/25/33/40/50(internal)/50/66(internal)/75(internal)/
Speed         100(internal)MHz
Chip Set      Unidentified
Video Chip    None
Set
Maximum       128MB
Onboard
Memory
Maximum Video Unidentified
Memory
Cache         128/256KB
BIOS          Unidentified
Dimensions    330mm x 218mm
I/O Options   32-bit VESA/PCI local bus slot, floppy drive interface, IDE
              interfaces (2), parallel port, PS/2 mouse port, serial ports
              (2),VESA feature connector, VGA port, riser slot, VRM
              connector
NPU Options   None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  Power LED                 CN1        IDE interface 2            J10

  IDE interface LED         CN2        VESA feature               J14
                                       connector

  PS/2 mouse port            J2        Speaker                    J27

  Serial port 1              J3        On/off switch              J29
                                       connector

  Serial port 2              J4        On/off switch power        J30
                                       supply connector

  Parallel port              J5        Riser slot                 SL1

  VGA port                   J6        32-bit VESA/PCI            SL2
                                       local bus slot

  Floppy drive               J7        VRM connector              VRM
  interface

  IDE interface 1            J9

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Flash BIOS write protect              J13        Pins 2 & 3 closed
      disabled

      Flash BIOS write protect              J13        Pins 1 & 2 closed
      enabled

     On board video enabled                J15        Pins 1 & 2 closed

      On board video disabled               J15        Pins 2 & 3 closed

     Factory configured - do not           JP2          Unidentified
      alter

     Modem answers on ring                 JP5        Pins 2 & 3 closed

      Modem does not answer on ring         JP5        Pins 1 & 2 closed

     Factory configured - do not          JP11          Unidentified
      alter

     PS/2 mouse enabled                   JP12             Closed

      PS/2 mouse disabled                  JP12              Open

     CMOS memory normal operation         JP14        Pins 1 & 2 closed

      CMOS memory clear                    JP14        Pins 2 & 3 closed

     VGA IRQ9 enabled                     JP15             Closed

      VGA IRQ9 disabled                    JP15              Open

     Floppy drive write protect            WP               Open
      disabled

      Floppy drive write protect            WP              Closed
      enabled

                           DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

     4MB        (1) 1M x 32       None           None          None

     8MB        (1) 1M x 32   (1) 1M x 32        None          None

     8MB        (1) 2M x 32       None           None          None

     12MB       (1) 1M x 32   (1) 1M x 32    (1) 1M x 32       None

     12MB       (1) 1M x 32   (1) 2M x 32        None          None

     16MB       (1) 4M x 32       None           None          None

     16MB       (1) 1M x 32   (1) 1M x 32    (1) 2M x 32       None

     16MB       (1) 2M x 32   (1) 2M x 32        None          None

     16MB       (1) 1M x 32   (1) 1M x 32    (1) 1M x 32    (1) 1M x 32

     20MB       (1) 1M x 32   (1) 2M x 32    (1) 2M x 32       None

     20MB       (1) 1M x 32   (1) 4M x 32        None          None

                       DRAM CONFIGURATION (CONT)

     Size         Bank 0         Bank 1         Bank 2        Bank 3

     24MB       (1) 2M x 32   (1) 2M x 32    (1) 2M x 32       None

     24MB       (1) 1M x 32   (1) 1M x 32    (1) 2M x 32    (1) 2M x 32

     24MB       (1) 1M x 32   (1) 1M x 32    (1) 4M x 32       None

     28MB       (1) 1M x 32   (1) 2M x 32    (1) 2M x 32    (1) 2M x 32

     28MB       (1) 1M x 32   (1) 1M x 32    (1) 4M x 32    (1) 1M x 32

     32MB       (1) 4M x 32   (1) 4M x 32        None          None

     32MB       (1) 8M x 32       None           None          None

     32MB       (1) 2M x 32   (1) 2M x 32    (1) 4M x 32       None

     32MB       (1) 2M x 32   (1) 2M x 32    (1) 2M x 32    (1) 2M x 32

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

     40MB       (1) 1M x 32   (1) 1M x 32    (1) 8M x 32       None

     40MB       (1) 1M x 32   (1) 1M x 32    (1) 4M x 32    (1) 4M x 32

     48MB       (1) 4M x 32   (1) 4M x 32    (1) 4M x 32       None

     48MB       (1) 2M x 32   (1) 2M x 32    (1) 8M x 32       None

     48MB       (1) 2M x 32   (1) 2M x 32    (1) 4M x 32    (1) 4M x 32

     52MB       (1) 1M x 32   (1) 4M x 32    (1) 4M x 32    (1) 4M x 32

     64MB       (1) 8M x 32   (1) 8M x 32        None          None

     64MB       (1) 4M x 32   (1) 4M x 32    (1) 8M x 32       None

     64MB       (1) 4M x 32   (1) 4M x 32    (1) 4M x 32    (1) 4M x 32

     68MB       (1) 1M x 32   (1) 8M x 32    (1) 4M x 32    (1) 4M x 32

     72MB       (1) 1M x 32   (1) 1M x 32    (1) 8M x 32    (1) 8M x 32

     80MB       (1) 2M x 32   (1) 2M x 32    (1) 8M x 32    (1) 8M x 32

     84MB       (1) 1M x 32   (1) 8M x 32    (1) 8M x 32    (1) 4M x 32

     96MB       (1) 8M x 32   (1) 8M x 32    (1) 8M x 32       None

     96MB       (1) 4M x 32   (1) 4M x 32    (1) 8M x 32    (1) 8M x 32

    100MB       (1) 1M x 32   (1) 8M x 32    (1) 8M x 32    (1) 8M x 32

    128MB       (1) 8M x 32   (1) 8M x 32    (1) 8M x 32    (1) 8M x 32

  Note: Board also accepts x 36 SIMMs.

                    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

                        CACHE JUMPER CONFIGURATION

       Size               J16                J17                J38

      128KB         Pins 2 & 3 closed        Open              Open

      256KB         Pins 1 & 2 closed       Closed             Open

            CPU SPEED SELECTION

   Speed      J35        J36        J37

   20MHz     Closed      Open      Open

   25MHz      Open      Closed    Closed

   33MHz      Open      Closed     Open

   40MHz      Open       Open     Closed

  50iMHz      Open      Closed    Closed

   50MHz      Open       Open      Open

  66iMHz      Open      Closed     Open

  75iMHz      Open      Closed    Closed

  100iMHz     Open      Closed     Open

                      CPU TYPE SELECTION

        Type                 J23                  J24

       80486SX         Pins 1 & 2 closed          Open

    486 Overdrive      Pins 2 & 3 closed          Open

       80486DX         Pins 2 & 3 closed          Open

      80486DX2         Pins 2 & 3 closed          Open

      80486DX4         Pins 2 & 3 closed          Open

        P24T           Pins 2 & 3 closed         Closed

  CPU MULTIPLIER SELECTION (80486DX4 ONLY)

      Multiplier               JP10

   Other multiplier      Pins 1 & 2 closed

          2x             Pins 3 & 4 closed

          3x                   Open

                     LOCAL BUS SELECTION ON RISER SLOT

    Setting          JP3            JP4            JP7           JP13

   VESA local     Pins 1 & 2     Pins 1 & 2       Open          Closed
      bus          closed          closed

   PCI local      Pins 2 & 3     Pins 2 & 3      Closed          Open
      bus          closed          closed

                    DMA CHANNEL SELECTION

       Channel               JP8                  JP9

          1            Pins 2 & 3 closed   Pins 2 & 3 closed

          3            Pins 1 & 2 closed   Pins 1 & 2 closed

