MYLEX CORPORATION

MVI486 & MVI486LC

Processor         80486SX/80487SX/80486DX
Processor Speed   20/25/33MHz
Chip Set          OPTI
Max. Onboard DRAM 32MB
Cache             64/128/256KB
BIOS              MYLEX
Dimensions        330mm x 218mm
I/O Options       32-bit VESA local bus slots (2), floppy drive interface,

                  IDE interface, parallel port, serial ports (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  32-bit VESA Local         J90       IDE interface LED           JP7
  bus slot

  32-bit VESA Local         J91       External battery            JP31
  bus slot

  Reset switch              JP2       Floppy drive interface       P1

  Speaker                   JP3       IDE port                     P2

  Power LED & keylock       JP4       Serial port 2                P3

  Turbo LED                 JP5       Serial port 1                P4

  Turbo switch              JP6

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Monitor type select monochrome          JP1              Open

      Monitor type select color               JP1             Closed

  »   CMOS memory clear                       JP30          pins 1 & 2
                                                              closed

      CMOS memory normal operation            JP30             Open
      (External battery)

      CMOS memory normal operation            JP30          pins 2 & 3
      (Internal battery)                                      closed

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       1MB        (1) 256K x 36         NONE

       4MB         (1) 1M x 36          NONE

       5MB         (1) 1M x 36     (1) 256K x 36

       6MB         (1) 1M x 36     (1) 512K x 36

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

      10MB         (1) 2M x 36     (1) 512K x 36

      12MB         (1) 2M x 36      (1) 1M x 36

      16MB         (1) 4M x 36          NONE

      18MB         (1) 4M x 36     (1) 512K x 36

      20MB         (1) 4M x 36      (1) 1M x 36

      32MB         (1) 4M x 36      (1) 4M x 36

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

      48MB         (1) 8M x 36      (1) 4M x 36

      64MB         (1) 8M x 36      (1) 8M x 36

                            CACHE CONFIGURATION

    Size      Bank 0     Bank 1     TAG/U15       TAG/U16       TAG/U17

    64KB     (4) 8K x   (4) 8K x      NONE       (1) 8K x 8   (1) 64K x 8
                8          8

   128KB      (4) 32K     NONE        NONE       (1) 8K x 8   (1) 64K x 8
               x 8

   256KB      (4) 32K    (4) 32K   (1) 8K x 8    (1) 8K x 8   (1) 64K x 8
               x 8        x 8

                        CACHE JUMPER CONFIGURATION

  Size      JP14     JP15       JP16       JP17        JP18       JP19

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

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

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

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

      Type              JP25                JP26               JP27

     80486SX            Open             pins 2 & 3            Open
                                           closed

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

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

                          CPU SPEED CONFIGURATION

     Speed             JP8                 JP9                JP10

     20MHz          pins 2 & 3          pins 1 & 2      pins 1 & 2 closed
                      closed             closed

     25MHz          pins 1 & 2          pins 2 & 3      pins 2 & 3 closed
                      closed             closed

     33MHz          pins 1 & 2          pins 1 & 2      pins 2 & 3 closed
                      closed             closed

                      PARALLEL PORT OUTPUT SELECTION

             Setting                      JP28                JP29

  »    Uni-directional (printer)         Closed              Closed

            Bi-directional                Open                Open