UNIDENTIFIED

SIH 486B

Processor              80486SX/80486DX/P23N/P23T
Processor Speed        16/20/25/33/40/50MHz
Chip Set               ASIC
Video Chip Set         None
Maximum Onboard Memory 32MB
Maximum Video Memory   None
Cache                  32/64/128/256KB
BIOS                   AMI
Dimensions             218mm x 218mm
I/O Options            None
NPU Options            None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery             J1       Turbo LED                  J5

  Power LED & keylock          J3       Turbo switch               J7

  Speaker                      J4       Reset switch               J8

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      Monitor type select color                J2              Open

      Monitor type select monochrome           J2             Closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       None

      2MB         (4) 256K x 9   (4) 256K x 9

      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         TAG 0          TAG 1

     32KB        (4) 8K x 8        None       (1) 16K x 4    (1) 8K x 8

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 16K x 4    (1) 8K x 8

     128KB      (4) 32K x 8        None       (1) 16K x 4    (1) 32K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 16K x 4    (1) 32K x 8

                 CACHE JUMPER CONFIGURATION

   Size       J11       J12       J13       J14       J15

   32KB      1 & 2     Open      1 & 2     1 & 2     1 & 2

   64KB      2 & 3     Open      1 & 2     2 & 3     1 & 2

  128KB      1 & 2     1 & 2     2 & 3     2 & 3     2 & 3

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

  Note: Pins designated should be in the closed position.

                    CACHE JUMPER CONFIGURATION (CON’T)

    Size           J16            J17            J18             J19

    32KB        Pins 1 & 2     Pins 1 & 2     Pins 1 & 2      Pins 1 & 2
                 closed          closed         closed         closed

    64KB        Pins 1 & 2     Pins 2 & 3     Pins 1 & 2      Pins 1 & 2
                 closed          closed         closed         closed

    128KB       Pins 1 & 2     Pins 2 & 3     Pins 2 & 3      Pins 1 & 2
                 closed          closed         closed         closed

    256KB       Pins 2 & 3     Pins 2 & 3     Pins 2 & 3      Pins 2 & 3
                 closed          closed         closed         closed

                        CPU SPEED SELECTION

         Speed          OSC installed in Y1             J9

         16MHz                 32MHz            Pins 2 & 3 closed

         20MHz                 40MHz            Pins 2 & 3 closed

         25MHz                 50MHz            Pins 2 & 3 closed

         25MHz                 25MHz            Pins 1 & 2 closed

         33MHz                 33MHz            Pins 1 & 2 closed

         50MHz                 50MHz            Pins 1 & 2 closed

                            CPU TYPE SELECTION

       Type               J20               J21                J22

      80486SX            Open            Pins 2 & 3           Open
                                          closed

      80486DX           Closed           Pins 1 & 2         Pins 1 & 2
                                          closed             closed

       P23N             Closed           Pins 1 & 2         Pins 2 & 3
                                          closed             closed

       P23T             Closed           Pins 1 & 2         Pins 1 & 2
                                          closed             closed