
MYLEX CORPORATION

MGI 486

Processor  80486SX/80486SX2/UMCU5/CX486DX/AM486DX/AM486DXL/80486DX/ CX486DX2/
           AM486DX2/AM486DXL2/80486DX2/80486DX4/P24D/Pentium Overdrive
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   SIS
Max.       64MB
Onboard
DRAM
Cache      64/128/256/512KB
BIOS       Award
Dimensions 250mm x 220mm
I/O        32-bit VESA local bus slots (3), green PC connector
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Green PC connector          D4       Reset switch                J5

  Green PC connector          J1       Turbo switch                J6

  Power LED & keylock         J2       Turbo LED                   J7

  Speaker                     J3       Green PC connector         JP13

  External battery            J4       32-bit VESA local bus   SL1 - SL3
                                       slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     CMOS memory normal operation            JP11          pins 1 & 2
                                                              closed

      CMOS memory clear                       JP11          pins 2 & 3
                                                              closed

     Factory configured - do not             RP1              N/A
      alter

                 DRAM CONFIGURATION (OPTION 1)

      Size          Bank 0          Bank 1          Bank 2

      1MB        (4) 256K x 9        NONE            NONE

      4MB         (4) 1M x 9         NONE            NONE

      16MB        (4) 4M x 9         NONE            NONE

      64MB        (4) 16M x 9        NONE            NONE

                   DRAM CONFIGURATION (OPTION 2)

      Size            Bank 0           Bank 1          Bank 2

       1MB             NONE        (1) 256K x 36        NONE

       2MB             NONE        (1) 256K x 36    (1) 256K x 36

       4MB             NONE         (1) 1M x 36         NONE

       5MB             NONE        (1) 256K x 36     (1) 1M x 36

       8MB             NONE         (1) 1M x 36      (1) 1M x 36

      16MB             NONE         (1) 4M x 36         NONE

      20MB             NONE         (1) 1M x 36      (1) 4M x 36

      32MB             NONE         (1) 4M x 36      (1) 4M x 36

                   DRAM CONFIGURATION (OPTION 3)

      Size            Bank 0           Bank 1          Bank 2

       2MB             NONE        (1) 512K x 36        NONE

       8MB             NONE         (1) 2M x 36         NONE

      10MB             NONE        (1) 512K x 36     (1) 2M x 36

      16MB             NONE         (1) 2M x 36      (1) 2M x 36

      32MB             NONE         (1) 8M x 36         NONE

      40MB             NONE         (1) 2M x 36      (1) 8M x 36

      64MB             NONE         (1) 8M x 36      (1) 8M x 36

                   DRAM CONFIGURATION (OPTION 4)

      Size            Bank 0           Bank 1          Bank 2

       2MB         (4) 256K x 9    (1) 256K x 36        NONE

       5MB         (4) 256K x 9     (1) 1M x 36         NONE

       6MB         (4) 256K x 9    (1) 256K x 36     (1) 1M x 36

       8MB          (4) 1M x 9      (1) 1M x 36         NONE

      12MB          (4) 1M x 9      (1) 1M x 36      (1) 1M x 36

      18MB         (4) 256K x 9    (1) 256K x 36     (1) 4M x 36

      20MB          (4) 1M x 9      (1) 4M x 36         NONE

      24MB          (4) 1M x 9      (1) 1M x 36      (1) 4M x 36

      32MB          (4) 4M x 9      (1) 4M x 36         NONE

      36MB          (4) 1M x 9      (1) 4M x 36      (1) 4M x 36

      48MB          (4) 4M x 9      (1) 4M x 36      (1) 4M x 36

               DRAM CONFIGURATION (OPTION 5)

     Size          Bank 0         Bank 1        Bank 2

     12MB        (4) 1M x 9    (1) 2M x 36       NONE

     16MB        (4) 1M x 9    (1) 2M x 36    (1) 1M x 36

     36MB        (4) 1M x 9    (1) 8M x 36       NONE

     48MB        (4) 4M x 9    (1) 8M x 36       NONE

     64MB        (4) 4M x 9    (1) 8M x 36    (1) 4M x 36

                        DRAM RESISTOR CONFIGURATION

  Setting         RP7             RP8            RP9            RP10

  Option 1         Not            Not             Not         Installed
               installed       installed      installed

  Option 2         Not         Installed          Not       Not installed
               installed                      installed

  Option 3     Installed          Not             Not       Not installed
                               installed      installed

  Option 4         Not            Not             Not         Installed
               installed       installed      installed

  Option 5         Not            Not         Installed     Not installed
               installed       installed

                            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) 16K x 8 or
                                                           (1) 32K x 8

       256KB          (4) 64K x 8           NONE          (1) 16K x 8 or
                                                           (1) 32K x 8

       512KB          (4) 64K x 8       (4) 64K x 8        (1) 32K x 8

                  CACHE JUMPER CONFIGURATION

        Size                 JP9                  JP20

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

        128KB          pins 2 & 3 closed   pins 1 & 2 closed

        256KB          pins 2 & 3 closed   pins 1 & 2 closed

        256KB          pins 2 & 3 closed   pins 1 & 2 closed

        512KB          pins 2 & 3 closed   pins 2 & 3 closed

                       CACHE RESISTOR CONFIGURATION

  Size       RP15         RP16         RP17         RP18          RP19

  64KB    Installed        Not          Not          Not           Not
                       installed     installed    installed    installed

  128KB       Not      Installed        Not          Not           Not
          installed                  installed    installed    installed

  256KB       Not          Not       Installed       Not           Not
          installed    installed                  installed    installed

  256KB       Not          Not          Not       Installed        Not
          installed    installed     installed                 installed

  512KB       Not          Not          Not          Not       Installed
          installed    installed     installed    installed

                       CPU TYPE CONFIGURATION

    Type        JP3        JP17       JP18        JP21       JP23

  80486SX      2 & 3      2 & 3       1 & 2       1 & 2      1 & 2

  80486SX2     2 & 3      2 & 3       1 & 2       1 & 2      1 & 2

   UMCU5       2 & 3      2 & 3       1 & 2       1 & 2      1 & 2

  CX486DX      1 & 2      1 & 2       1 & 2       1 & 2      1 & 2

  80486DX      2 & 3      2 & 3       1 & 2       1 & 2      1 & 2

  80486DX2     2 & 3      2 & 3       1 & 2       1 & 2      1 & 2

  80486DX4     2 & 3      2 & 3       1 & 2       1 & 2      1 & 2

    P24D       2 & 3      2 & 3       1 & 2       1 & 2      1 & 2

    P24T       2 & 3      2 & 3       1 & 2       1 & 2      2 & 3

  Note: Pins designated should be in the closed position.

                             CPU TYPE CONFIGURATION (CONT)

   Type         RP3         RP4          RP5          RP6          RP30        RP31

  80486SX       Not          Not      Installed        Not          Not      Installed
             installed   installed                 installed    installed

  80486SX2      Not          Not      Installed        Not          Not      Installed
             installed   installed                 installed    installed

   UMCU5        Not          Not      Installed        Not          Not      Installed
             installed   installed                 installed    installed

  CX486DX    Installed       Not          Not          Not      Installed       Not
                         installed    installed    installed                 installed

  80486DX    Installed       Not          Not          Not          Not      Installed
                         installed    installed    installed    installed

  80486DX2   Installed       Not          Not          Not          Not      Installed
                         installed    installed    installed    installed

  80486DX4   Installed       Not          Not          Not          Not      Installed
                         installed    installed    installed    installed

   P24D         Not      Installed        Not      Installed        Not         Not
             installed                installed                 installed    installed

   P24T      Installed       Not          Not          Not          Not      Installed
                         installed    installed    installed    installed

  CPU SPEED CONFIGURATION (MX8315/UM9515 CLOCK)

    Speed        JP5          JP6         JP7

    25MHz        Open        Open        Closed

    33MHz       Closed      Closed       Closed

    40MHz        Open       Closed       Closed

   50iMHz        Open        Open        Closed

    50MHz       Closed       Open         Open

   66iMHz       Closed      Closed       Closed

   75iMHz        Open        Open        Closed

   100iMHz      Closed      Closed       Closed

  CPU SPEED CONFIGURATION (IMI SC466 CLOCK)

   Speed        JP5        JP6         JP7

   25MHz       Open        Open       Open

   33MHz      Closed      Closed      Open

   40MHz       Open       Closed      Open

   50iMHz      Open        Open       Open

   50MHz      Closed       Open       Open

   66iMHz     Closed      Closed      Open

   75iMHz      Open        Open       Open

  100iMHz     Closed      Closed      Open

                  CPU CORE FREQUENCY CONFIGURATION

          CPU                   JP22                   JP27

         Cyrix           pins 1 & 2 closed             Open

       AMD486DX2                Open                  Closed

  Intel 80486DX (3x)            Open                   Open

       AMD486DX4                Open                   Open

  Intel 80486DX4 (2x)    pins 2 & 3 closed             Open

                         CPU VOLTAGE CONFIGURATION

    Voltage          JP1           JP2            JP4           JP24

     3.3v           Open           Open          Open         pins 1 & 2
                                                               closed

     4.0v           Open           Open          Open         pins 2 & 3
                                                               closed

     5.0v          Closed         Closed        Closed          Open

      VESA WAIT STATE CONFIGURATION

     Wait states             JP15

    0 wait states     pins 1 & 2 closed

    1 wait state      pins 2 & 3 closed

         BUS SPEED CONFIGURATION

      CPU speed              JP16

      <= 33MHz        pins 1 & 2 closed

       > 33MHz        pins 2 & 3 closed

