
MITAC INTERNATIONAL CORPORATION

IH4077D

Processor  80486SX/CXM7/80486DX/80486DX2/80486DX4/P23N/P24D/Pentium Overdrive
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   EFAR
Max.       64MB
Onboard
DRAM
Cache      64/128/256KB
BIOS       Award
Dimensions 254mm x 218mm
I/O        32-bit VESA local bus slots (2), floppy drive interface, IDE
Options    interface, parallel port, serial ports (2)
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  IDE interface              CN1       Turbo switch               JP45

  Floppy drive               CN2       Reset switch               JP46
  interface

  Serial port 2               J9       Power LED & keylock        JP49

  Serial port 1              J10       Speaker                    JP50

  Parallel port              J11       IDE interface LED          JP51

  External battery           JP7       D/D board connector       JP200

  Turbo LED                  JP21      32-bit VESA local bus   SL1 & SL2
                                       slots

                        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

     CMOS memory normal operation            JP4           pins 2 & 3
                                                              closed

      CMOS memory clear                       JP4           pins 1 & 2
                                                              closed

     Factory configured - do not             JP5              N/A
      alter

     Factory configured - do not             JP6              N/A
      alter

     Parallel port IRQ select IRQ7           JP13          pins 2 & 3
                                                              closed

      Parallel port IRQ select IRQ5           JP13          pins 1 & 2
                                                              closed

     Factory configured - do not             JP14             N/A
      alter

     Factory configured - do not             JP15             N/A
      alter

     Factory configured - do not             JP17             N/A
      alter

     Factory configured - do not             JP23             N/A
      alter

     Factory configured - do not             JP33             N/A
      alter

     Factory configured - do not             JP48             N/A
      alter

     BIOS type select normal                JP130          pins 1 & 2
                                                              closed

      BIOS type select flash                 JP130          pins 2 & 3
                                                              closed

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

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

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

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

     3MB        (1) 256K x     (1) 256K x     (1) 256K x        NONE
                    36             36             36

     4MB        (1) 256K x     (1) 256K x     (1) 256K x    (1) 256K x 36
                    36             36             36

     4MB        (1) 512K x        NONE        (1) 512K x        NONE
                    36                            36

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

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

     6MB        (1) 512K x        NONE       (1) 1M x 36        NONE
                    36

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

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

     12MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        NONE

     16MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

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

     16MB      (1) 4M x 36        NONE           NONE           NONE

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

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

     32MB      (1) 8M x 36        NONE           NONE           NONE

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

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

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

                            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

            Note: The orientation of the banks is unidentified. Bank 0 =
            U23, 25, 27, & 29. Bank 1 = U24, 26, 28, & 30.

                        CACHE JUMPER CONFIGURATION

   Size        JP8         JP9        JP10         JP11          JP12

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

   128KB      Closed      Closed      Open      pins 2 & 3     pins 2 & 3
                                                  closed        closed

   256KB      Closed      Closed     Closed     pins 1 & 2     pins 1 & 2
                                                  closed        closed

                          CPU TYPE CONFIGURATION

    Type       JP16      JP18      JP24       JP27      JP28       JP29

  80486SX     Closed     Open      Open       Open     Closed      Open

   CX M7       Open     Closed    Closed     Closed     Open      Closed

  80486DX     Closed     Open      Open       Open     Closed      Open

  80486DX2    Closed     Open      Open       Open     Closed      Open

  80486DX4    Closed     Open      Open       Open     Closed      Open

    P23N      Closed     Open      Open       Open     Closed      Open

    P24D       Open     Closed    Closed      Open     Closed      Open

    P24T       Open     Closed    Closed      Open     Closed      Open

                      CPU TYPE CONFIGURATION (CONT)

    Type       JP34       JP35       JP38       JP39      JP40     JP41

  80486SX     Closed     Closed     Closed      Open      Open     2 & 3

   CX M7       Open       Open       Open      Closed     2 & 3    1 & 2

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

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

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

    P23N      Closed     Closed     Closed     Closed     1 & 2    1 & 2

    P24D       Open       Open       Open      Closed     2 & 3    1 & 2

    P24T       Open       Open       Open      Closed     1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

                   CPU TYPE CONFIGURATION (CONT)

    Type       JP42        JP43       JP44        JP47       JP110

  80486SX      2 & 3      2 & 3       2 & 3       Open       Open

   CX M7       1 & 2      1 & 2       1 & 2      Closed     Closed

  80486DX      2 & 3      2 & 3       2 & 3       Open       Open

  80486DX2     2 & 3      2 & 3       2 & 3       Open       Open

  80486DX4     2 & 3      2 & 3       2 & 3       Open       Open

    P23N       2 & 3      2 & 3       2 & 3       Open       Open

    P24D       2 & 3      2 & 3       2 & 3      Closed      Open

    P24T       2 & 3      2 & 3       2 & 3       Open       Open

  Note: Pins designated should be in the closed position.

  CPU TYPE CONFIGURATION (CX M7 ONLY)

        Type                JP25

      CX486DX               Open

      CX486DX2             Closed

          CPU SPEED CONFIGURATION

   Speed      JP30       JP31      JP32

   25MHz     Closed      Open      Open

   33MHz     Closed     Closed    Closed

   40MHZ     Closed     Closed     Open

  50iMHz     Closed      Open      Open

   50MHz      Open       Open     Closed

  66iMHz     Closed     Closed    Closed

  75iMHz     Closed      Open      Open

  100iMHz    Closed     Closed    Closed

  CPU SPEED CONFIGURATION (80486DX4 ONLY)

     Speed          JP22          JP26

      1x            N/A           Open

      2x           Closed          N/A

     2.5x           N/A            N/A

      3x            Open         Closed

      VESA WAIT STATE CONFIGURATION

     Wait states             JP37

    0 wait states     pins 1 & 2 closed

    1 wait state      pins 2 & 3 closed

         BUS SPEED CONFIGURATION

      CPU speed              JP36

      <= 33MHz        pins 1 & 2 closed

       > 33MHz        pins 2 & 3 closed

