
GEMLIGHT COMPUTER, LTD.

GMB-486SG (VER. 6.02)

Processor    CX486S/UMCU5/80486SX/SL80486SX/CX486DX/80486DX/
             SL80486DX/CX486DX2/AM486DX2/(SL)AM486DX2/80486DX2/
             SL80486DX2/AM486DX4/(SL)AM486DX4/80486DX4/P24D/P24T
Processor    20/25/33/40/50(internal)/50/60/66(internal)/75(internal)/
Speed        80(internal)/100(internal)MHz
Chip Set     Unidentified
Video Chip   None
Set
Maximum      128MB
Onboard
Memory
Maximum      None
Video Memory
Cache        128/256/512KB
BIOS         Award
Dimensions   250mm x 220mm
I/O Options  32-bit VESA local bus slots (3), green PC connector
NPU Options  None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  External battery            J1       Reset switch                J6

  Green PC connector          J2       Power LED & keylock         J7

  Turbo switch                J3       Green PC connector         JP26

  Turbo LED                   J4       Green PC LED               JP27

  Speaker                     J5       32-bit VESA local bus   SL1  SL3
                                       slots

                        USER CONFIGURABLE SETTINGS

                  Function                      Label        Position

     Turbo enabled                              J3          Pins 2 & 3
                                                              closed

      Turbo disabled                             J3          Pins 1 & 2
                                                              closed

     CMOS memory normal operation              JP16         Pins 1 & 2
                                                              closed

      CMOS memory clear                         JP16         Pins 2 & 3
                                                              closed

     Monitor type select                       JP17           Open
      monochrome/VGA/EGA

      Monitor type select EGA                   JP17          Closed

     CLKIN delay for CPUCLK                    JP20         Pins 2 & 3
                                                              closed

      CLKIN & CPUCLK same phase                 JP20         Pins 1 & 2
                                                              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

     4MB         (1) 256K x     (1) 256K x     (1) 512K x        None
                    36             36             36

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

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

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

     6MB         (1) 256K x     (1) 256K x    (1) 1M x 36        None
                    36             36

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

     8MB         (1) 256K x     (1) 256K x     (1) 512K x    (1) 1M x 36
                    36             36             36

     8MB         (1) 512K x     (1) 512K x    (1) 1M x 36        None
                    36             36

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

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

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

     12MB        (1) 512K x     (1) 512K x    (1) 1M x 36    (1) 1M x 36
                    36             36

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

     12MB       (1) 1M x 36    (1) 2M x 36       None            None

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

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

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

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

     17MB        (1) 256K x    (1) 4M x 36       None            None
                    36

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     18MB         (1) 256K x     (1) 256K x    (1) 4M x 36       None
                     36             36

     18MB         (1) 512K x    (1) 4M x 36       None           None
                     36

     20MB         (1) 512K x     (1) 512K x    (1) 4M x 36       None
                     36             36

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

     20MB        (1) 1M x 36    (1) 2M x 36    (1) 2M x 36       None

     24MB         (1) 512K x     (1) 512K x    (1) 1M x 36   (1) 4M x 36
                     36             36

     24MB        (1) 1M x 36    (1) 1M x 36    (1) 4M x 36       None

     24MB        (1) 2M x 36    (1) 2M x 36    (1) 2M x 36       None

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

     24MB        (1) 2M x 36    (1) 4M x 36       None           None

     28MB        (1) 1M x 36    (1) 2M x 36    (1) 2M x 36   (1) 2M x 36

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

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

     32MB        (1) 2M x 36    (1) 2M x 36    (1) 4M x 36       None

     32MB        (1) 2M x 36    (1) 2M x 36    (1) 2M x 36   (1) 2M x 36

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

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

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

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

     40MB        (1) 1M x 36    (1) 1M x 36    (1) 8M x 36       None

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

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

     48MB        (1) 4M x 36    (1) 8M x 36       None           None

     48MB        (1) 2M x 36    (1) 2M x 36    (1) 4M x 36   (1) 4M x 36

     48MB        (1) 2M x 36    (1) 2M x 36    (1) 8M x 36       None

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

     64MB        (1) 16M x 36      None           None           None

     64MB        (1) 4M x 36    (1) 4M x 36    (1) 8M x 36       None

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

     65MB         (1) 256K x    (1) 16M x 36      None           None
                     36

     68MB        (1) 1M x 36    (1) 16M x 36      None           None

     68MB        (1) 1M x 36    (1) 8M x 36    (1) 8M x 36       None

     72MB        (1) 1M x 36    (1) 1M x 36     (1) 16M x        None
                                                   36

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

     80MB        (1) 4M x 36    (1) 16M x 36      None           None

     80MB        (1) 4M x 36    (1) 8M x 36    (1) 8M x 36       None

     80MB        (1) 2M x 36    (1) 2M x 36    (1) 8M x 36   (1) 8M x 36

     96MB        (1) 4M x 36    (1) 4M x 36     (1) 16M x        None
                                                   36

     96MB        (1) 4M x 36    (1) 4M x 36    (1) 8M x 36   (1) 8M x 36

     96MB        (1) 8M x 36    (1) 8M x 36    (1) 8M x 36       None

     128MB       (1) 16M x 36   (1) 16M x 36      None           None

     128MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36   (1) 8M x 36

                            CACHE CONFIGURATION

       Size              Bank 0            Bank 1              TAG

       128KB          (4) 32K x 8           None            (1) 8K x 8

     256KB (A)        (4) 32K x 8        (4) 32K x 8     (1) 16K/32K x 8

     256KB (B)        (4) 64K x 8           None         (1) 16K/32K x 8

       512KB          (4) 128K x 8          None           (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size              JP1                JP3                JP33

     128KB           Pins 1 & 2       Pins 1 & 2, 3 &   Pins 2 & 3 closed
                       closed            4 closed

   256KB (A)         Pins 2 & 3       Pins 2 & 3, 4 &   Pins 2 & 3 closed
                       closed            5 closed

   256KB (B)         Pins 1 & 2       Pins 1 & 2, 3 &   Pins 1 & 2 closed
                       closed            4 closed

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

                      CACHE TAG JUMPER CONFIGURATION

      Cache              TAG               JP2                 JP4

      128KB          (1) 8K x 8         Pins 1 & 2      Pins 1 & 2 closed
                                         closed

   256KB (A,B)       (1) 16K x 8        Pins 3 & 4            Open
                                         closed

   256KB (A,B)       (1) 32K x 8        Pins 2 & 3      Pins 1 & 2 closed
                                         closed

      512KB          (1) 32K x 8        Pins 2 & 3      Pins 2 & 3 closed
                                         closed

      CPU SPEED SELECTION (AV9107-03)

   Speed      JP5        JP6        JP7

   20MHz     Closed      Open     Closed

   25MHz     Closed     Closed     Open

   33MHz      Open      Closed    Closed

   40MHz     Closed      Open      Open

  50iMHz     Closed     Closed     Open

   50MHz      Open       Open     Closed

  66iMHz      Open      Closed    Closed

  75iMHz     Closed     Closed     Open

  80iMHz     Closed      Open      Open

  100iMHz     Open      Closed    Closed

       CPU SPEED SELECTION (MS-8315)

   Speed      JP5        JP6        JP7

   20MHz      Open       Open      Open

   25MHz      Open      Closed     Open

   33MHz     Closed     Closed    Closed

   40MHz      Open      Closed    Closed

  50iMHz      Open      Closed     Open

   50MHz     Closed      Open      Open

  66iMHz     Closed     Closed    Closed

  75iMHz      Open      Closed     Open

  80iMHz      Open      Closed    Closed

  100iMHz    Closed     Closed    Closed

                            CPU TYPE SELECTION

        Type            JP8       JP10       JP11      JP12       JP13

       CX486S          2 & 3     2 & 3       Open      2 & 3,     Open
                                                       4 & 5

       UMC U5          1 & 2,    2 & 3      1 & 2,     Open       Open
                       3 & 4                3 & 4

       80486SX         2 & 3     2 & 3       Open      3 & 4      1 & 2

      SL80486SX        2 & 3     2 & 3       Open      3 & 4      1 & 2

       CX486DX         1 & 2,    2 & 3      3 & 4      2 & 3      Open
                       3 & 4

       80486DX         1 & 2,    2 & 3      3 & 4      3 & 4      1 & 2
                       3 & 4

      SL80486DX        1 & 2,    2 & 3      3 & 4      3 & 4      1 & 2
                       3 & 4

      CX486DX2         1 & 2,    2 & 3      3 & 4      2 & 3      Open
                       3 & 4

   CX486DX2 (3.6v)     1 & 2,    2 & 3      3 & 4      2 & 3      Open
                       3 & 4

    CX486DX2 (4v)      1 & 2,    2 & 3      3 & 4      2 & 3      Open
                       3 & 4

  AM486DX2 (3.45v)     1 & 2,    2 & 3      3 & 4      Open       Open
                       3 & 4

     (SL)AM486DX2      1 & 2,    2 & 3      3 & 4      1 & 2,     2 & 3
       (3.45v)         3 & 4                           3 & 4

      80486DX2         1 & 2,    2 & 3      3 & 4      3 & 4      1 & 2
                       3 & 4

     SL80486DX2        1 & 2,    2 & 3      3 & 4      3 & 4      1 & 2
                       3 & 4

  AM486DX4 (3.45v)     1 & 2,    2 & 3      3 & 4      Open       Open
                       3 & 4

     (SL)AM486DX4      1 & 2,    2 & 3      3 & 4      1 & 2,     2 & 3
       (3.45v)         3 & 4                           3 & 4

      80486DX4         1 & 2,    2 & 3      3 & 4      3 & 4      1 & 2
                       3 & 4

        P24D           1 & 2,    1 & 2      3 & 4      1 & 2,     2 & 3
                       3 & 4                           3 & 4

        P24T           1 & 2,    1 & 2      2 & 3      3 & 4      Open
                       3 & 4

  Note: Pins designated should be in the closed position.

                        CPU TYPE SELECTION (CONT)

       Type           JP14     JP15     JP21     JP22     JP24     JP25

      CX486S         1 & 2,   2 & 3    1 & 2    2 & 3     2 & 3    2 & 3
                     3 & 4

      UMC U5          Open     Open    1 & 2    2 & 3     3 & 4    Open

      80486SX        2 & 3    4 & 5    2 & 3    1 & 2     Open     Open

     SL80486SX       2 & 3    4 & 5    2 & 3    1 & 2     Open     Open

      CX486DX        1 & 2    2 & 3    1 & 2    2 & 3     2 & 3    2 & 3

      80486DX        2 & 3    4 & 5    2 & 3    1 & 2     Open     Open

     SL80486DX       2 & 3    4 & 5    2 & 3    1 & 2     Open     Open

     CX486DX2        1 & 2    2 & 3    1 & 2    2 & 3     2 & 3    2 & 3

  CX486DX2 (3.6v)    1 & 2    2 & 3    1 & 2    2 & 3     2 & 3    2 & 3

   CX486DX2 (4v)     1 & 2    2 & 3    1 & 2    2 & 3     2 & 3    2 & 3

  AM486DX2 (3.45v)    Open     Open    2 & 3    1 & 2     Open     Open

    (SL)AM486DX2     2 & 3    4 & 5    1 & 2    1 & 2     5 & 6    Open
      (3.45v)

     80486DX2        2 & 3    4 & 5    2 & 3    1 & 2     Open     Open

    SL80486DX2       2 & 3    4 & 5    2 & 3    1 & 2     Open     Open

  AM486DX4 (3.45v)    Open     Open    2 & 3    1 & 2     Open     Open

    (SL)AM486DX4     2 & 3    4 & 5    1 & 2    1 & 2     Open     Open
      (3.45v)

     80486DX4        2 & 3    4 & 5    2 & 3    1 & 2     Open     Open

       P24D          2 & 3    4 & 5    1 & 2    1 & 2     Open     1 & 2

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

  Note: Pins designated should be in the closed position.

                        CPU TYPE SELECTION (CONT)

       Type          JP30     JP31     JP34     JP35      JP36      JP38

      CX486S         Open     Open    1 & 2    Closed     Open      Open

      UMC U5         Open     Open    2 & 3    Closed     Open      Open

      80486SX        Open     Open    1 & 2    Closed     Open      Open

     SL80486SX       Open     Open    1 & 2    Closed     Open      Open

      CX486DX        Open     Open    1 & 2    Closed     Open      Open

      80486DX        Open     Open    1 & 2    Closed     Open      Open

     SL80486DX       Open     Open    1 & 2    Closed     Open      Open

     CX486DX2        Open     Open    1 & 2    Closed     Open      Open

  CX486DX2 (3.6v)    Open     Open    1 & 2     Open      Open     1 & 2

   CX486DX2 (4v)     Open     Open    1 & 2     Open      Open     2 & 3

      AM486DX2      2 & 3     Open     Open     Open      2 & 3     Open
      (3.45v)

    (SL)AM486DX2    1 & 2    1 & 2    1 & 2     Open      2 & 3     Open
      (3.45v)

     80486DX2        Open     Open    1 & 2    Closed     Open      Open

    SL80486DX2       Open     Open    1 & 2    Closed     Open      Open

      AM486DX4       Open     Open     Open     Open      2 & 3     Open
      (3.45v)

    (SL)AM486DX4    1 & 2    1 & 2    1 & 2     Open      2 & 3     Open
      (3.45v)

     80486DX4        Open     Open    1 & 2     Open      1 & 2     Open

       P24D         1 & 2    1 & 2    1 & 2    Closed     Open      Open

       P24T          Open     Open    1 & 2    Closed     Open      Open

  Note: Pins designated should be in the closed position.

                        VL BUS WAIT STATE SELECTION

               Setting                                JP28

                    0                          Pins 1 & 2 closed

                   1                          Pins 2 & 3 closed

                          VL BUS SPEED SELECTION

                 Speed                                 JP29

                  <= 33MHz                      Pins 1 & 2 closed

                 >33 MHz                       Pins 2 & 3 closed

                           FLASH BIOS SELECTION

                Setting                                JP37

                  EPROM                               Open

                  5v flash                      Pins 2 & 3 closed

                 12v flash                      Pins 1 & 2 closed

