UNIDENTIFIED

ISA-S486B

Processor         80486SX/80486DX/80486DX2
Processor Speed   16/20/25/33/50(internal)/50MHz
Chip Set          Symphony
Max. Onboard DRAM 32MB
Cache             64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Power LED & keylock         JP5       Speaker                   JP16

  Turbo switch                JP10      Reset switch              JP19

  Turbo LED                   JP11

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Factory configured - do not             JP1              N/A
      alter

  »   Factory configured - do not             JP2              N/A
      alter

  »   Factory configured - do not             JP3              N/A
      alter

  »   Monitor type select color               JP6             Closed

      Monitor type select monochrome          JP6              Open

  »   Factory configured - do not             JP8              N/A
      alter

  »   Factory configured - do not             JP9              N/A
      alter

  »   Factory configured - do not             JP33             N/A
      alter

  »   Factory configured - do not             JP35             N/A
      alter

              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

      5MB         (4) 1M x 9     (4) 256K x 9

      5MB         (4) 256K x 9    (4) 1M x 9

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

      16MB        (4) 4M x 9         NONE

      17MB        (4) 4M x 9     (4) 256K x 9

      17MB        (4) 256K x 9    (4) 4M x 9

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

      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

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

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

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

                        CACHE JUMPER CONFIGURATION

      Size              JP22               JP23               JP34

      64KB            pins 1 & 2        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

      128KB           pins 1 & 2        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

      256KB           pins 2 & 3        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

                    CACHE JUMPER CONFIGURATION (CON’T)

     Size                 JP100                          JP101

     64KB       pins 1 & 3, 5 & 7, 9 & 11,     pins 1 & 3, 5 & 7, 9 & 11,
                      13 & 15 closed                13 & 15 closed

    128KB       pins 2 & 4, 6 & 8, 10 & 12,   pins 2 & 4, 6 & 8, 10 & 12,
                      14 & 16 closed                14 & 16 closed

    256KB       pins 1 & 3, 5 & 7, 9 & 11,     pins 1 & 3, 5 & 7, 9 & 11,
                      13 & 15 closed                13 & 15 closed

                          CPU TYPE CONFIGURATION

       Type               JP12              JP13               JP14

      80486SX             Open           pins 2 & 3            Open
                                           closed

      80486DX            Closed          pins 1 & 2           Closed
                                           closed