FOCUS INFORMATION SYSTEMS, INC.

486IU

Processor         80486SX/80487SX/80486DX
Processor Speed   25/33/40/50MHz
Chip Set          UMC
Max. Onboard DRAM 64MB
Cache             64/128/256/512/1024KB
BIOS              AMI/MR
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            J2       Power LED & keylock         J9

  Turbo switch                J7       Turbo LED                   W14

  Speaker                     J8       Reset switch                W15

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CMOS memory normal operation             J1            pins 2 & 3
                                                              closed

      CMOS memory clear                        J1            pins 1 & 2
                                                              closed

  »   Monitor type select color                W1             Closed

      Monitor type select monochrome           W1              Open

                            DRAM CONFIGURATION

   Size         Bank 0         Bank 1          Bank 2          Bank 3

    1MB      (4) 256K x 9       NONE            NONE            NONE

    2MB      (4) 256K x 9    (4) 256K x 9       NONE            NONE

    3MB      (4) 256K x 9    (4) 256K x 9    (4) 256K x 9       NONE

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

    4MB       (4) 1M x 9        NONE            NONE            NONE

    5MB      (4) 256K x 9    (4) 1M x 9         NONE            NONE

    6MB      (4) 256K x 9    (4) 256K x 9    (4) 1M x 9         NONE

    8MB       (4) 1M x 9     (4) 1M x 9         NONE            NONE

    9MB      (4) 256K x 9    (4) 1M x 9      (4) 1M x 9         NONE

   10MB      (4) 256K x 9    (4) 256K x 9    (4) 1M x 9      (4) 1M x 9

   12MB       (4) 1M x 9     (4) 1M x 9      (4) 1M x 9         NONE

   16MB       (4) 1M x 9     (4) 1M x 9      (4) 1M x 9      (4) 1M x 9

   16MB       (4) 4M x 9        NONE            NONE            NONE

   20MB       (4) 1M x 9     (4) 4M x 9         NONE            NONE

   24MB       (4) 1M x 9     (4) 1M x 9      (4) 4M x 9         NONE

   32MB       (4) 4M x 9     (4) 4M x 9         NONE            NONE

   36MB       (4) 1M x 9     (4) 4M x 9      (4) 4M x 9         NONE

   40MB       (4) 1M x 9     (4) 1M x 9      (4) 4M x 9      (4) 4M x 9

   48MB       (4) 4M x 9     (4) 4M x 9      (4) 4M x 9         NONE

   64MB       (4) 4M x 9     (4) 4M x 9      (4) 4M x 9      (4) 4M x 9

                         CPU JUMPER CONFIGURATION

     CPU           W3            W17            W18             W19

   80486SX        Open          Open            Open         pins 2 & 3
                                                               closed

   80487SX        Open         Closed        pins 2 & 3      pins 1 & 2
                                               closed          closed

   80486DX        Open         Closed        pins 1 & 2      pins 1 & 2
                                               closed          closed

  Note:When a 20MHz 80486SX CPU is used, W3 is closed and a 40MHz clock
  is installed.

                            CACHE CONFIGURATION

   Size       Bank 0         Bank 1       TAG (U25, U34,      TAG (U36)
                                               U35)

   64KB     (4) 8K x 8     (4) 8K x 8      (3) 16K x 4          NONE

  128KB     (4) 32K x 8       NONE         (3) 16K x 4          NONE

  256KB     (4) 32K x 8    (4) 32K x 8     (3) 16K x 4          NONE

  512KB     (4) 128K x 8      NONE         (3) 64K x 4       (1) 64K x 4

  1024KB    (4) 128K x 8   (4) 128K x 8    (3) 64K x 4       (1) 64K x 4

                        CACHE JUMPER CONFIGURATION

  Size     W7   W8   W9   W10    W12    W13     W20    W21   W22     W23

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

  128KB     1    1    2   1 &    1 &   Closed   2 &    1 &   Open   Open
            &    &    &    2     2               3     2
           2    2    3

  256KB     1    2    2   1 &    1 &   Closed   1 &    2 &   Open   Open
            &    &    &    2     2               2     3
           2    3    3

  512KB     2    2    2   2 &    1 &   Open     Open   1 &    2 &   1 & 2
            &    &    &    3     2                     2      3
           3    3    3

  1024KB    2    2    2   2 &    2 &   Open     Open   1 &    1 &   2 & 3
            &    &    &    3     3                     2      2
           3    3    3

  Note:Pins designated should be in the closed position.