
GMX, INC.

ESA-MB

Processor        80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed  33/66(internal)MHz
Chip Set         National/INTEL
Max. Onboard DRAM256MB
SRAM Cache       64/128 (optional on CPU card only)
BIOS             AMI (located on CPU card)
Dimensions       307.34mm x 330.20mm
I/O Options      Floppy drive interface, IDE interface, parallel port,

                 proprietary CPU card, serial port (2)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  8-bit ISA slot              J9        Serial port (COM2)         P7

  Proprietary CPU card        J10       Speaker                    P10

  Keyboard interface          P1        Turbo Switch               P11

  Floppy drive interface      P2        Power LED & keylock        P12

  IDE interface               P3        IDE interface LED          P13

  Auxiliary power             P4        Reset switch               P14
  connector

  Parallel port               P5        Lockable reset switch      P15

  Serial port (COM1)          P6

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper          Position

     IDE interface select IORDY at          JA-2       pins 2 & 4 closed
      pin 21

      IDE interface select IORDY at          JA-2       pins 4 & 6 closed
      pin 27

     Watchdog strobe select 1.8MHz          JA-4       pins 5 & 6 closed
      clock

      Watchdog strobe select host            JA-4       pins 3 & 4 closed
      address strobe

      Watchdog strobe select signal          JA-4       pins 1 & 2 closed
      watchdog

     IDE interface address latch            JA-5            Closed
      enabled at IDE pin 28

      IDE interface address select           JA-5             Open
      spindle sync at IDE pin 28

     ISA bus select 0 wait state            JA-7        pins 1 & 3 open

      ISA bus select 1 wait state            JA-7       pins 1 & 3 closed

     Posted memory write cycles             JA-7       pins 2 & 4 closed
      enabled

      Posted memory write cycles             JA-7        pins 2 & 4 open
      disabled

     Factory configured - do not         JA-8 & JA-9          N/A
      alter

     Keyboard buffer full interrupts       JA-10       pins 2 & 3 closed
      from keyboard controller

      Keyboard buffer full interrupts       JA-10       pins 1 & 2 closed
      from 82351 at IRQ1

     Address enable active on slot 0       JA-11       pins 1 & 2 closed
      & slot 8 (J9)

      Address enable active on slot 8       JA-11        pins 1 & 2 open
      (J9) only

      . Factory configured - do not         JA-12              N/A
      alter

     Factory configured - do not           JA-13              N/A
      alter

     Memory speed select speed 1           JA-14       pins 1 & 3 closed

      Memory speed select speed 0           JA-14       pins 2 & 4 closed

     CMOS memory normal operation          JA-15       pins 2 & 3 closed

      CMOS memory clear                     JA-15       pins 1 & 2 closed

      Floppy drive select 2 drives          JA-17             Open

      Floppy drive select 3 drives          JA-17       pins 1 & 2, 3 & 4
                                                             closed

     UART type 16550                        JA18       pins 1 & 2 closed

      UART type 16540                        JA18       pins 2 & 3 closed

     IDE interface select National         JA-19       pins 1 & 2 closed
      chipset

      IDE interface Intel chipset           JA-19       pins 2 & 3 closed

     Floppy drive select National          JA--20      pins 1 & 2 closed
      chipsey

      Floppy drive select Intel             JA-20       pins 2 & 3 closed
      chipset

     Keylock disabled                      JA-21       pins 2 & 3 closed

      Keylock enabled                       JA-21       pins 1 & 2 closed

  Note:SW1 & SW2 are software dependent.

                            DRAM CONFIGURATION

  Size    Bank0   Bank1   Bank2    Bank3   Bank4   Bank5   Bank6   Bank7

  1MB     256K    NONE    NONE     NONE    NONE    NONE    NONE     NONE

  2MB     256K    256K    NONE     NONE    NONE    NONE    NONE     NONE

  2MB     512K    NONE    NONE     NONE    NONE    NONE    NONE     NONE

  3MB     256K    256K    256K     NONE    NONE    NONE    NONE     NONE

  4MB     256K    256K    256K     256K    NONE    NONE    NONE     NONE

  4MB     512K    512K    NONE     NONE    NONE    NONE    NONE     NONE

  4MB      1M     NONE    NONE     NONE    NONE    NONE    NONE     NONE

  5MB     256K    256K    256K     256K    256K    NONE    NONE     NONE

  6MB     256K    256K    256K     256K    256K    256K    NONE     NONE

  6MB     256K    256K    256K     256K    512K    NONE    NONE     NONE

  6MB     512K    512K    512K     NONE    NONE    NONE    NONE     NONE

  7MB     256K    256K    256K     256K    256K    256K    256K     NONE

  8MB     256K    256K    256K     256K    256K    256K    256K     256K

  8MB     256K    256K    256K     256K    512K    512K    NONE     NONE

  8MB     256K    256K    256K     256K     1M     NONE    NONE     NONE

  8MB     512K    512K    512K     512K    NONE    NONE    NONE     NONE

  8MB      1M      1M     NONE     NONE    NONE    NONE    NONE     NONE

  8MB      2M     NONE    NONE     NONE    NONE    NONE    NONE     NONE

  9MB     512K    512K    512K     512K    256K    NONE    NONE     NONE

  10MB    512K    512K    512K     512K    256K    256K    NONE     NONE

  10MB    512K    512K    512K     512K    512K    NONE    NONE     NONE

  11MB    512K    512K    512K     512K    256K    256K    256K     NONE

  12MB    512K    512K    512K     512K    256K    256K    256K     256K

  12MB    512K    512K    512K     512K    512K    512K    NONE     NONE

  12MB    512K    512K    512K     512K     1M     NONE    NONE     NONE

  12MB     1M      1M      1M      NONE    NONE    NONE    NONE     NONE

  14MB    512K    512K    512K     512K    512K    512K    512K     NONE

  16MB    512K    512K    512K     512K    512K    512K    512K     512K

  16MB    512K    512K    512K     512K     1M      1M     NONE     NONE

  16MB    512K    512K    512K     512K     2M     NONE    NONE     NONE

  16MB     1M      1M      1M       1M     NONE    NONE    NONE     NONE

  16MB     2M      2M     NONE     NONE    NONE    NONE    NONE     NONE

  16MB     4M     NONE    NONE     NONE    NONE    NONE    NONE     NONE

  17MB     1M      1M      1M       1M     256K    NONE    NONE     NONE

  18MB     1M      1M      1M       1M     256K    256K    NONE     NONE

  18MB     1M      1M      1M       1M     512K    NONE    NONE     NONE

  19MB     1M      1M      1M       1M     256K    256K    256K     NONE

  20MB     1M      1M      1M       1M     256K    256K    256K     256K

  20MB     1M      1M      1M       1M     512K    512K    NONE     NONE

  20MB     1M      1M      1M       1M      1M     NONE    NONE     NONE

  22MB     1M      1M      1M       1M     512K    512K    512K     NONE

  24MB     1M      1M      1M       1M     512K    512K    512K     512K

  24MB     1M      1M      1M       1M      1M      1M     NONE     NONE

                      DRAM CONFIGURATION (CONTINUED)

  Size    Bank0   Bank1   Bank2    Bank3   Bank4   Bank5   Bank6   Bank7

  24MB     1M      1M      1M       1M      2M     NONE    NONE     NONE

  24MB     2M      2M      2M      NONE    NONE    NONE    NONE     NONE

  28MB     1M      1M      1M       1M      1M      1M      1M      NONE

  32MB     1M      1M      1M       1M      1M      1M      1M       1M

  32MB     1M      1M      1M       1M      2M      2M     NONE     NONE

  32MB     1M      1M      1M       1M      4M     NONE    NONE     NONE

  32MB     4M      4M     NONE     NONE    NONE    NONE    NONE     NONE

  32MB     8M     NONE    NONE     NONE    NONE    NONE    NONE     NONE

  32MB     2M      2M      2M       2M     NONE    NONE    NONE     NONE

  33MB     2M      2M      2M       2M     256K    NONE    NONE     NONE

  34MB     2M      2M      2M       2M     256K    256K    NONE     NONE

  34MB     2M      2M      2M       2M     512K    NONE    NONE     NONE

  35MB     2M      2M      2M       2M     256K    256K    256K     NONE

  36MB     2M      2M      2M       2M     256K    256K    256K     256K

  36MB     2M      2M      2M       2M     512K    512K    NONE     NONE

  36MB     2M      2M      2M       2M      1M     NONE    NONE     NONE

  38MB     2M      2M      2M       2M     512K    512K    512K     NONE

  40MB     2M      2M      2M       2M     512K    512K    512K     512K

  40MB     2M      2M      2M       2M      1M      1M     NONE     NONE

  40MB     2M      2M      2M       2M      2M     NONE    NONE     NONE

  44MB     2M      2M      2M       2M      1M      1M      1M      NONE

  48MB     2M      2M      2M       2M      1M      1M      1M       1M

  48MB     2M      2M      2M       2M      2M      2M     NONE     NONE

  48MB     2M      2M      2M       2M      4M     NONE    NONE     NONE

  48MB     4M      4M      4M      NONE    NONE    NONE    NONE     NONE

  56MB     2M      2M      2M       2M      2M      2M      2M      NONE

  64MB     2M      2M      2M       2M      2M      2M      2M       2M

  64MB     2M      2M      2M       2M      4M      4M     NONE     NONE

  64MB     2M      2M      2M       2M      8M     NONE    NONE     NONE

  64MB     4M      4M      4M       4M     NONE    NONE    NONE     NONE

  64MB     8M      8M     NONE     NONE    NONE    NONE    NONE     NONE

  65MB     4M      4M      4M       4M     256K    NONE    NONE     NONE

  66MB     4M      4M      4M       4M     256K    256K    NONE     NONE

  66MB     4M      4M      4M       4M     512K    NONE    NONE     NONE

  67MB     4M      4M      4M       4M     256K    256K    256K     NONE

  68MB     4M      4M      4M       4M     256K    256K    256K     256K

  68MB     4M      4M      4M       4M     512K    512K    NONE     NONE

  68MB     4M      4M      4M       4M      1M     NONE    NONE     NONE

  70MB     4M      4M      4M       4M     512K    512K    512K     NONE

  72MB     4M      4M      4M       4M     512K    512K    512K     512K

  72MB     4M      4M      4M       4M      1M      1M     NONE     NONE

  72MB     4M      4M      4M       4M      2M     NONE    NONE     NONE

                      DRAM CONFIGURATION (CONTINUED)

  Size    Bank0   Bank1    Bank2   Bank3   Bank4   Bank5    Bank6   Bank7

  80MB     4M      4M       4M      4M      2M      2M      NONE    NONE

  80MB     4M      4M       4M      4M      4M     NONE     NONE    NONE

  88MB     4M      4M       4M      4M      2M      2M       2M     NONE

  96MB     4M      4M       4M      4M      4M      4M      NONE    NONE

  96MB     4M      4M       4M      4M      8M     NONE     NONE    NONE

  96MB     4M      4M       4M      4M      2M      2M       2M      2M

  96MB     8M      8M       8M     NONE    NONE    NONE     NONE    NONE

  128MB    8M      8M       8M      8M     NONE    NONE     NONE    NONE

  128MB    4M      4M       4M      4M      8M      8M      NONE    NONE

  129MB    8M      8M       8M      8M     256K    NONE     NONE    NONE

  130MB    8M      8M       8M      8M     256K    256K     NONE    NONE

  130MB    8M      8M       8M      8M     512K    NONE     NONE    NONE

  131MB    8M      8M       8M      8M     256K    256K     256K    NONE

  132MB    8M      8M       8M      8M     256K    256K     256K    256K

  132MB    8M      8M       8M      8M     512K    512K     NONE    NONE

  132MB    8M      8M       8M      8M      1M     NONE     NONE    NONE

  134MB    8M      8M       8M      8M     512K    512K     512K    NONE

  136MB    8M      8M       8M      8M     512K    512K     512K    512K

  136MB    8M      8M       8M      8M      1M      1M      NONE    NONE

  136MB    8M      8M       8M      8M      2M     NONE     NONE    NONE

  140MB    8M      8M       8M      8M      1M      1M       1M     NONE

  144MB    8M      8M       8M      8M      1M      1M       1M      1M

  144MB    8M      8M       8M      8M      2M      2M      NONE    NONE

  144MB    8M      8M       8M      8M      4M     NONE     NONE    NONE

  152MB    8M      8M       8M      8M      2M      2M       2M     NONE

  160MB    8M      8M       8M      8M      2M      2M       2M      2M

  160MB    8M      8M       8M      8M      4M      4M      NONE    NONE

  160MB    8M      8M       8M      8M      8M     NONE     NONE    NONE

  176MB    8M      8M       8M      8M      4M      4M       4M     NONE

  192MB    8M      8M       8M      8M      4M      4M       4M      4M

  192MB    8M      8M       8M      8M      8M      8M      NONE    NONE

  224MB    8M      8M       8M      8M      8M      8M       8M     NONE

  256MB    8M      8M       8M      8M      8M      8M       8M      8M

  Note: The 512K x 36, 2M x 36, and 8M x 36 SIMMs are double-sided SIMMs.

     FLOPPY DRIVE 0 CONFIGURATION

        A:          JA-1/pins 2 & 4

       3.5"              Closed

       5.25"              Open

     FLOPPY DRIVE 1 CONFIGURATION

        B:          JA-1/pins 1 & 3

       3.5"              Closed

       5.25"              Open

  FLOPPY DRIVE POWER CONFIGURATION

    Drive Type            RP3

   Normal 3.5"           150 W

  Low power 3.5"         1K W

               IDE INTERFACE I/O READY SIGNAL CONFIGURATION

                IORDY                         JA-2/pins 2, 4, & 6

      At pin 21 of IDE interface               pins 2 & 4 closed

      At pin 27 of IDE interface               pins 4 & 6 closed

  Note:If the hard drive has the IORDY signal at at both pins then either
  configuration will work.

                      IDE INTERFACE DMA CONFIGURATION

       DMA          JA-2/pins 1 & 2    JA-2/pins 3 & 5     JA-6 & JA-16

       DMA6              Closed             Closed           pins 1 & 2
                                                              closed

     Disabled             Open               Open            pins 2 & 3
                                                              closed

  Note:If the drive supports DMA then the IORDY signal must be at pin 27
  of the IDE interface.

                       WATCHDOG TIMER CONFIGURATION

  Timeout Minimum    Timeout Typical   Timeout Maximum         JA-3

       50ms              150ms              250ms           pins 1 & 2
                                                              closed

       250ms             600ms             1000ms              Open

       400ms             1200ms            2000ms           pins 2 & 3
                                                              closed

[Image]

                                CONNECTIONS

  Purpose                                                Location

  CPU cooling fan power +12VDC                              P1

  Optional secondary cache module (64K or 128K)             U7

            Note:All DRAM banks must be populated on the motherboard
            before any cache modules can be installed.

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper          Position

     Flash memory normal operation at       JA-1       pins 2 & 3 closed
      address A16

      Flash memory inverted operation        JA-1        pins 1 & 2 open
      at address A16

     Flash BIOS write protect enabled       JA-2       pins 1 & 3, 2 & 4
                                                             closed

      Flash BIOS write protect               JA-2       pins 1 & 3, 2 & 4
      disabled                                                open

                          CPU TYPE CONFIGURATION

         Type             Speed            JA-3               JA-4

       80486SX            33MHz          pins 1 & 2     pins 2 & 4 closed
                                          closed

     80486DX/DX2        33/66i MHz       pins 1 & 2     pins 1 & 2, 3 & 4
                                          closed             closed

      ODPR486DX           33MHz          pins 1 & 2     pins 1 & 2, 3 & 4
                                          closed             closed

       ODP486DX           33MHz          pins 2 & 3     pins 1 & 2, 3 & 4
                                          closed             closed

  Note:ODPR486DX is pin compatible with the 80486DX/80486DX2 processors.

