
GEMLIGHT COMPUTER, LTD.

GMB-486APS (VER. 1.00)

Device     Mainboard
Type
Processor  80486SX/80486SX2/80487SX/80486DX/80486DX2/80486DX4/P24C/P24D/P24T/AM
           486DX2/AM 486DX4/AM 5X86/CX 486DX/CX 486DX2/CX 486DX4-GP/CX
           486DX4-GP4/CX 5X86/IBM 486/TI 486DX2/TI 486DX4/UMC U5S/SGS
           ST486DX/SGS ST486DX2/SGS ST486DX4V
Processor  25/33/40/50/60/66/75/90/100/120/133
Speed
Chip Set   ALI
Maximum    128MB (EDO & SDRAM supported)
Onboard
Memory
Cache      128/256/512KB
BIOS       Award
Dimensions 220mm x 220mm
I/O        32-bit PCI slots (4), floppy drive interface, IDE interfaces (2),
Options    parallel port, serial ports (2), IR connector, green PC connector

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  IDE interface 1            CN1       Reset switch                J2

  IDE interface 2            CN2       Turbo switch                J3

  Parallel port              CN3       Turbo LED                   J4

  Floppy drive interface     CN4       Power LED & keylock         J5

  IR connector               CN5       Speaker                     J6

  Serial port 1              CN6       IDE interface LED           J7

  Serial port 2              CN7       Green PC connector         JP21

  External battery            J1       32-bit PCI slots         PC1 - PC4

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     CMOS memory normal operation             J1           Pins 1 & 2
                                                              closed

      CMOS memory clear                        J1           Pins 2 & 3
                                                              closed

      Flash BIOS voltage select 5V            JP9           Pins 1 & 2
                                                              closed

      Flash BIOS voltage select 12V           JP9           Pins 2 & 3
                                                              closed

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       2MB        (2) 256K x 36         None

       4MB        (2) 256K x 36    (2) 256K x 36

       4MB        (2) 256K x 36         None

       8MB         (2) 1MB x 36         None

      10MB         (2) 1MB x 36    (2) 256K x 36

      16MB         (2) 1MB x 36     (2) 1MB x 36

      16MB         (2) 1MB x 36         None

      16MB         (2) 2MB x 36         None

      18MB         (2) 2MB x 36    (2) 256K x 36

      24MB         (2) 2MB x 36     (2) 1MB x 36

      32MB         (2) 2MB x 36     (2) 2MB x 36

      32MB         (2) 2MB x 36         None

      32MB         (2) 4MB x 36         None

      34MB         (2) 4MB x 36    (2) 256K x 36

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

      48MB         (2) 4MB x 36     (2) 2MB x 36

      64MB         (2) 4MB x 36     (2) 4MB x 36

      64MB         (2) 4MB x 36         None

      64MB         (2) 8MB x 36         None

      66MB         (2) 8MB x 36    (2) 256K x 36

      72MB         (2) 8MB x 36     (2) 1MB x 36

      80MB         (2) 8MB x 36     (2) 2MB x 36

      96MB         (2) 8MB x 36     (2) 4MB x 36

      128MB        (2) 8MB x 36     (2) 8MB x 36

      128MB        (2) 8MB x 36         None

    CACHE MEMORY CONFIGURATION

    Size      Bank 0       TAG

   128KB      32K x 8     8K x 8

   256KB      64K x 8    16K x 8

   512KB      128K x 8   32K x 8

                        CACHE JUMPER CONFIGURATION

         Size                    JP15                      JP30

         128KB                   Open                Pins 2 & 3 closed

         256KB             Pins 2 & 3 closed         Pins 1 & 2 closed

         512KB             Pins 1 & 2, 3 & 4         Pins 1 & 2 closed
                                closed

                      CPU SPEED SELECTION

    Speed        JP2       JP5       JP6        JP7       JP8

    25MHz       1 & 2      Open      Open      1 & 2     Open

    33MHz       1 & 2     Closed    Closed     1 & 2     Open

    40MHz       2 & 3     Closed     Open      2 & 3     Closed

  Note: Pins designated are in the closed position.

                        CPU TYPE SELECTION (INTEL)

         Type            JP19       JP20      JP22      JP23       JP24

  80486DX2/DX4 (P24C)    2 & 3      Open      Open      1 & 2     1 & 2

    80486DX2 (P24D)      2 & 3      Open     5 & 6      2 & 3     1 & 2
        (L1WB)

     80486DX/DX2         2 & 3      Open      Open      1 & 2      Open

       80487SX           1 & 2      Open      Open      1 & 2      Open

     80486SX/SX2         Open       Open      Open      1 & 2     1 & 2

       80486SX           Open       Open      Open      1 & 2      Open

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

  Note: Designated pins are in the closed position.

                     CPU TYPE SELECTION (INTEL CONT.)

        Type             JP25        JP26      JP27      JP28      JP29

     80486DX2/DX4       Closed      3 & 4     1 & 2     2 & 3      Open
       (P24C)

   80486DX2 (P24D)      Closed      3 & 4     1 & 2     2 & 3     3 & 4
       (L1WB)

     80486DX/DX2         Open       1 & 2      Open     2 & 3      Open

       80487SX           Open       1 & 2      Open     2 & 3      Open

     80486SX/SX2        Closed      3 & 4     1 & 2     1 & 2      Open

       80486SX           Open       1 & 2      Open     1 & 2      Open

        P24T            Closed      3 & 4     1 & 2     2 & 3      Open

  Note: Designated pins are in the closed position.

                        CPU TYPE SELECTION (CYRIX)

         Type             JP19      JP20       JP22      JP23      JP24

      486DX4-GP4         2 & 3      Open       Open     1 & 2      1 & 2

  DX/DX2/DX2-V/DX4-GP    2 & 3      Open      1 & 2     1 & 2      3 & 4

        CX 5X86          2 & 3      Open      5 & 6     1 & 2      1 & 2

  Note: Designated pins are in the closed position.

                     CPU TYPE SELECTION (CYRIX CONT.)

         Type              JP25       JP26      JP27     JP28      JP29

      486DX4-GP4          Closed     3 & 4     1 & 2     2 & 3     Open

  DX/DX2/DX2-V/DX4-GP     Closed     5 & 6     3 & 4     2 & 3     1 & 2

        CX 5X86           Closed     3 & 4     1 & 2     2 & 3     3 & 4

  Note: Designated pins are in the closed position.

                         CPU TYPE SELECTION (AMD)

         Type             JP19      JP20       JP22      JP23      JP24

     Am486DX2/DX4        2 & 3      Open       Open     1 & 2      1 & 2

  Am486DX2/DX4 (SV8B)    2 & 3      Open      5 & 6     2 & 3      1 & 2

   AMD-5X86 (AMD-5X)     2 & 3      Open      5 & 6     2 & 3      1 & 2

      Am486DX/DX2        2 & 3      Open       Open     1 & 2      Open

  Note: Designated pins are in the closed position.

                      CPU TYPE SELECTION (AMD CONT.)

         Type             JP25       JP26      JP27      JP28      JP29

     Am486DX2/DX4        Closed      3 & 4     1 & 2     2 & 3     Open

  Am486DX2/DX4 (SV8B)    Closed      3 & 4     1 & 2     2 & 3     3 & 4

  AMD-5X86 (AMD-5X)      Closed      3 & 4     1 & 2     2 & 3     3 & 4

     Am486DX/DX2          Open       1 & 2     Open      2 & 3     Open

  Note: Designated pins are in the closed position.

                   CPU TYPE SELECTION (THOMSON)

       Type           JP19      JP20      JP22     JP23     JP24

   ST486DX4V10HS      2 & 3     Open      Open    1 & 2     1 & 2

  Note: Designated pins are in the closed position.

              CPU TYPE SELECTION (THOMSON CONT.)

       Type          JP25     JP26     JP27     JP28    JP29

  ST486DX4V10HS     Closed    3 & 4   1 & 2    2 & 3    Open

  Note: Designated pins are in the closed position.

               CPU TYPE SELECTION (TEXAS INSTUMENTS)

       Type           JP19      JP20      JP22     JP23     JP24

      486DX2          2 & 3     Open     1 & 2    1 & 2     3 & 4

  Note: Designated pins are in the closed position.

            CPU TYPE SELECTION (TEXAS INSTUMENTS CONT.)

       Type           JP25      JP26      JP27     JP28     JP29

      486DX2         Closed     5 & 6    3 & 4    2 & 3     1 & 2

  Note: Designated pins are in the closed position.

                     CPU TYPE SELECTION (IBM)

       Type           JP19      JP20      JP22     JP23     JP24

   486-4V3100GC       2 & 3     Open     1 & 2    1 & 2     3 & 4

   486-4V3100GIC      2 & 3     Open     5 & 6    1 & 2     1 & 2

  Note: Designated pins are in the closed position.

                  CPU TYPE SELECTION (IBM CONT.)

       Type           JP25      JP26      JP27     JP28     JP29

   486-4V3100GC      Closed     5 & 6    3 & 4    2 & 3     1 & 2

   486-4V3100GIC     Closed     3 & 4    1 & 2    2 & 3     3 & 4

  Note: Designated pins are in the closed position.

                   CPU TYPE SELECTION (UMC)

       Type         JP19      JP20    JP22     JP23    JP24

       U5S          2 & 3     Open    Open     1 & 2   Open

  Note: Designated pins are in the closed position.

                CPU TYPE SELECTION (UMC CONT.)

       Type         JP25      JP26    JP27     JP28    JP29

       U5S          Open      1 & 2   Open     2 & 3   Open

  Note: Designated pins are in the closed position.

                           CPU VOLTAGE SELECTION

   Voltage     JP13/pins 1    JP13/pins 3     JP13/pins 5   JP13/pins 7 &
                   & 2            & 4            & 6              8

    3.3v          Open          Closed           Open           Open

    3.45v         Open           Open           Closed          Open

    3.6v          Open           Open            Open          Closed

     4v           Open           Open            Open           Open

     5v          Closed          Open            Open           Open

