ROBOTECH, INC.

GMB-486UN

Processor         80486SX/80486DX/80486DX2
Processor Speed   25/33/50/66MHz
Chip Set          UMC
Max. onboard DRAM 32MB
Cache             32/64/128/256KB
BIOS              AMI
Dimensions        254mm x 218mm
I/O Options       None
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            CN1      Reset switch                CN6

  Turbo LED                   CN4      Speaker                     CN7

  Turbo switch                CN5      Power LED & keylock         CN8

                        USER CONFIGURABLE SETTINGS

                Function                      Switch          Setting

  »   CMOS memory normal operation             JP2         1 & 2 closed

      CMOS memory clear                        JP2         2 & 3 closed

  »   Hardware Emulate KBGA20                  JP10        1 & 2 closed

      Keyboard controller 8042                 JP10        2 & 3 closed

  »   Monitor type select color                JP12           Closed

      Monitor type select monochrome           JP12            Open

           DRAM CONFIGURATION

  Size       Bank 0          Bank 1

  1MB     (4) 256K x 9        NONE

  2MB     (4) 256K x 9    (4) 256K x 9

  4MB      (4) 1M x 9         NONE

  5MB     (4) 256K x 9     (4) 1M x 9

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

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

  20MB     (4) 1M x 9      (4) 4M x 9

  20MB     (4) 4M x 9      (4) 1M x 9

  32MB     (4) 4M x 9      (4) 4M x 9

                         EPROM TYPE CONFIGURATION

      CPU            JP3            JP7           JP9            JP13

   80486SX-25       2 & 3          Open          2 & 3          2 & 3

   80486DX-33       1 & 2          1 & 2       1 & 2, 3 &       1 & 2
                                                   4

   80486DX-50       2 & 3          1 & 2       1 & 2, 3 &       1 & 2
                                                   4

  80486DX2-50       1 & 2          1 & 2       1 & 2, 3 &       1 & 2
                                                   4

  80486DX2-66       1 & 2          1 & 2       1 & 2, 3 &       1 & 2
                                                   4

  Note: Pins designated should be in the closed position.

                  CACHE TYPE CONFIGURATION

     Size           Bank 0         Bank 1          TAG

     32KB         (4) 8K x 8        NONE        (1) 8K x 8

     64KB         (4) 8K x 8       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

                         CACHE SIZE CONFIGURATION

      Size           JP22          JP23           JP25           JP26

      32KB          2 & 3          Open          2 & 3          2 & 3

      64KB          1 & 2          1 & 2       1 & 2, 3 &       1 & 2
                                                   4

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

     256KB          1 & 2          1 & 2       1 & 2, 3 &       1 & 2
                                                   4

  Note: Pins designated should be in the closed position.

                     CACHE SIZE CONFIGURATION (CON’T)

      Size                   JP27                         JP28

      32KB         1 & 2, 3 & 4, 5 & 6, 7 &               Open
                          8, 9 & 10

      64KB                   Open               1 & 2, 3 & 4, 5 & 6, 7 &
                                                       8, 9 & 10

      128KB                  Open                         Open

      256KB                  Open                         Open

  Note: Pins designated should be in the closed position.

                     CACHE SIZE CONFIGURATION (CON’T)

      Size                   JP29                         JP30

      32KB                   Open                         Open

      64KB                   Open                         Open

      128KB        1 & 2, 3 & 4, 5 & 6, 7 &               Open
                          8, 9 & 10

      256KB                  Open               1 & 2, 3 & 4, 5 & 6, 7 &
                                                       8, 9 & 10

  Note: Pins designated should be in the closed position.