SIEMENS NIXDORF INFORMATIONSSYSTEME AG

S26361-D756-X

Processor           80486SX/80487SX/80486DX/80486DX2
Processor Speed     25/33/50(internal)/66(internal)MHz
Chip Set            Unidentified
Video Chip Set      Unidentified
Maximum Onboard     32MB
Memory
Maximum Video       1MB
Memory
Cache               64/128/256KB
BIOS                Unidentified
Dimensions          330mm x 218mm
I/O Options         Floppy drive interface, IDE interface, parallel port,
                    PS/2 mouse port, serial ports (2), video feature
                    connector, VGA port, riser slot
NPU Options         None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Front panel connector       CN1      Serial port 2               J20

  Speaker                     J13      Parallel port               J21

  PS/2 mouse port             J15      Video feature               J23
                                       connector

  IDE interface               J17      VGA port                    J24

  Floppy drive interface      J18      External battery            JP8

  Serial port 1               J19      Riser slot                  SL1

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

  »   Internal battery enabled                JP8           Pins 1 & 2
                                                              closed

      Internal battery disabled (CMOS         JP8           Pins 2 & 3
      memory clear)                                           closed

  »   Monitor type select color               JP10             Open

      Monitor type select monochrome          JP10            Closed

  »   PS/2 mouse IRQ12 enabled                JP11            Closed

      PS/2 mouse IRQ12 disabled               JP11             Open

  »   On board video enabled                  JP25          Pins 1 & 2
                                                              closed

      On board video disabled                 JP25          Pins 2 & 3
                                                              closed

           DRAM CONFIGURATION

     Size        Bank 0        Bank 1

     4MB        (4) 1M x 9      None

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

     16MB       (4) 4M x 9      None

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

     32MB       (4) 4M x 9   (4) 4M x 9

                   CACHE CONFIGURATION

       Size              Bank 0             Bank 1

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

       128KB          (4) 32K x 8            None

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

  Note: The locations of banks 0 & 1 are unidentified.

                  CACHE TAG CONFIGURATION

     Size            U48            U49            U50

     64KB        (1) 8K x 8        None        (1) 16K x 8

     128KB       (1) 8K x 8        None        (1) 16K x 8

     256KB       (1) 8K x 8     (1) 8K x 8     (1) 16K x 8

  Note: The locations of U48, U49 & U50 are unidentified.

                     CACHE JUMPER CONFIGURATION

   Size     JP12      JP13     JP14      JP15      JP16      JP17

   None     2 & 3    2 & 3     Open      Open      Open      Open

   64KB     2 & 3    2 & 3     Open      Open      Open      Open

  128KB     1 & 2    1 & 2     Closed    Open      Open     Closed

  256KB     2 & 3    2 & 3     Closed    Closed   Closed    Closed

  Note: Pins designated should be in the closed position.

         VIDEO MEMORY CONFIGURATION

     Size          Bank 0        Bank 1

     512KB         512KB          None

      1MB          512KB          512KB

  Note: The chips sizes are unidentified.

     CPU SPEED SELECTION

  Speed      JP5       JP6

  25MHz     Closed     Open

  33MHz      Open     Closed

  50iMHz    Closed     Open

  66iMHz     Open     Closed

                            CPU TYPE SELECTION

       Type               JP1                JP2               JP3

      80486SX             Open            Pins 1 & 2           Open
                                           closed

      80487SX          Pins 2 & 3         Pins 1 & 2        Pins 1 & 2
                         closed            closed             closed

      80486DX          Pins 1 & 2         Pins 2 & 3        Pins 1 & 2
                         closed            closed             closed

     80486DX2          Pins 1 & 2         Pins 2 & 3        Pins 1 & 2
                         closed            closed             closed

  Note: If upgrade socket is filled, JP1 must be open.

                       MISCELLANEOUS TECHNICAL NOTE

  Note: The location of pin 1 on the jumpers and connectors are
  unidentified.