
IBM CORPORATION

PC SERVER 300 (TYPE 8640) ONO, 1NO, 1NJ, ONJ

Processor   80486SX/80486DX/80486DX2/80486DX4/P24T
Processor   25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set    Unidentified
Video Chip  None
Set
Maximum     128MB
Onboard
Memory
Maximum     None
Video
Memory
Cache       128/256KB
BIOS        Unidentified
Dimensions  355mm x 304mm
I/O Options 32-bit PCI slots (3), floppy drive interface, IDE interfaces
            (2), parallel port, PS/2 mouse port, serial ports (2)
NPU Options None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  PS/2 mouse port             J2       IDE interface 1            J21

  Speaker                     J5       IDE interface 2            J22

  Parallel port               J8       Power LED                  W12

  Floppy drive interface      J9       PCI IDE interface LED      W39

  Serial port 2              J10       ISA IDE interface LED      W46

  Serial port 1              J11       32-bit PCI slots         PC1  PC3

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     Secondary cache write select             W1           Pins 2 & 3
      write back                                              closed

      Secondary cache write select             W1           Pins 1 & 2
      write through                                           closed

     Internal cache write select write        W4              Open
      through

      Internal cache write select write        W4             Closed
      back

     BIOS normal operation                    W6           Pins 2 & 3
                                                              closed

      BIOS recovery mode                       W6           Pins 1 & 2
                                                              closed

     Factory configured - do not alter        W8             Closed

     PS/2 mouse enabled                      W10             Closed

      PS/2 mouse disabled                     W10              Open

      DPU generates parity                    W17           Pins 1 & 2
                                                              closed

      CPU generates parity                    W17           Pins 2 & 3
                                                              closed

     DPU parity error disabled               W18           Pins 2 & 3
                                                              closed

      DPU parity error enabled                W18           Pins 1 & 2
                                                              closed

     Cache enabled                           W21              Open

      Cache disabled                          W21             Closed

     PCI IDE IRQ14 enabled                   W35             Closed

      PCI IDE IRQ14 disabled                  W35              Open

     PCI IDE PCI INT A disabled              W37             Closed

      PCI IDE PCI INT A enabled               W37              Open

     PCI IRQ15 disabled                      W38              Open

      PCI IRQ15 enabled                       W38             Closed

      ISA IDE IRQ select IRQ14                W42           Pins 1 & 2
                                                              closed

      ISA IDE IRQ select IRQ15                W42           Pins 2 & 3
                                                              closed

                           SIMM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

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

     8MB        (1) 2M x 36       None           None          None

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

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

     12MB       (1) 1M x 36   (1) 1M x 36    (1) 1M x 36       None

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

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

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

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

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

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

     24MB       (1) 4M x 36   (1) 1M x 36    (1) 1M x 36       None

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

     24MB       (1) 2M x 36   (1) 2M x 36    (1) 2M x 36       None

     28MB       (1) 4M x 36   (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

     32MB       (1) 8M x 36       None           None          None

     32MB       (1) 4M x 36   (1) 2M x 36    (1) 2M x 36       None

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

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

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

     40MB       (1) 8M x 36   (1) 1M x 36    (1) 1M x 36       None

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

     40MB       (1) 4M x 36   (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

     44MB       (1) 8M x 36   (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

     48MB       (1) 8M x 36   (1) 2M x 36    (1) 2M x 36       None

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

     48MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36       None

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

     64MB       (1) 8M x 36   (1) 4M x 36    (1) 4M x 36       None

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

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

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

     96MB       (1) 8M x 36   (1) 8M x 36    (1) 8M x 36       None

    112MB       (1) 4M x 36   (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

    128MB       (1) 8M x 36   (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

                 CACHE CONFIGURATION

  Note: The location of the cache is unidentified.

       CACHE JUMPER CONFIGURATION

   Size       W5       W22       W23

  128KB      Open    Closed     Open

  256KB     Closed    Open     Closed

                             TAG CONFIGURATION

            Type                       W24                   W26

              7-bit                   Open                  Closed

              8-bit                  Closed                 Closed

             9-bit                  Closed                  Open

             Reserved                 Open                   Open

      CPU SPEED SELECTION

   Speed      W16        W20

   25MHz      Open     Closed

   33MHz     Closed     Open

  50iMHz      Open     Closed

  66iMHz     Closed     Open

  75iMHz      Open     Closed

  100iMHz    Closed     Open

                            CPU TYPE SELECTION

           Type                      W2                      W3

         80486SX             Pins 2 & 3 closed             Closed

         80486DX              Pins 1 & 2, 3 & 4            Closed
                                   closed

         80486DX2             Pins 1 & 2, 3 & 4            Closed
                                   closed

         80486DX4             Pins 1 & 2, 3 & 4            Closed
                                   closed

           P24T               Pins 1 & 2, 3 & 4             Open
                                   closed

               CPU MULTIPLIER SELECTION

        Multiplier                    W33

         80486DX4              Pins 1 & 2 closed

       80486DX4 (2x)           Pins 2 & 3 closed

  80486SX/DX/DX2/DX4 (3x)             Open

                         IDE DMA CHANNEL SELECTION

                 Channel                                W43

               PIO transfer                           Open

                      6                          Pins 1 & 2 closed

                      7                          Pins 2 & 3 closed

                PCI IRQ JUMPER SELECTION

  Note: The jumper settings for J101 are unidentified.

