UPDATE TECHNOLOGY, INC.

VL-BUS MAINBOARD

Processor             80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed       20/25/33/50(internal)/50/66(internal)MHz
Chip Set              UNI
Max. Onboard DRAM     32MB
SRAM Cache            32/64/128/256KB
BIOS                  AMI
Dimensions            254mm x 218mm
I/O Options           32-bit VESA local-bus card slots (3)
NPU Options           None

[Image]

                                CONNECTIONS

  Purpose                Location     Purpose                  Location

  Turbo switch              J4        External battery            J8

  Turbo LED                 J5        Reset switch               J10

  Speaker                   J6        32-bit VESA              S1 - S3
                                      local-bus cards (3)

  Power LED &               J7
  keylock

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

  »   Monitor type select color                J11            closed

      Monitor type select monochrome           J11             open

  »   CMOS memory normal operation             JP2           pins 1 & 2
      (internal battery)                                      closed

      CMOS memory normal operation             JP2             open
      (external battery)

      CMOS memory clear                        JP2           pins 2 & 3
                                                              closed

  »   VESA local bus speed select (CPU         JP19           closed
      £ 33MHz)

      VESA local bus speed select (CPU         JP19            open
      > 33MHz)

  »   VESA local bus wait states select        JP20           closed
      0 (CPU >33MHz)

      VESA local bus wait state select         JP20            open
      1 (CPU £ 33MHz)

  »   VESA local bus speed select CPU/1        JP43          pins 1 & 2
                                                              closed

      VESA local bus speed select CPU/2        JP43          pins 2 & 3
                                                              closed

  »   CPU speed select £ 33MHz                 JP44          pins 2 & 3
                                                              closed

      CPU speed select > 33MHz                 JP44          pins 1 & 2
                                                              closed

                          CPU TYPE CONFIGURATION

                 CPU                                   J4

              80486DX2                    pins 1 & 2, 4 & 5, and 6 & 7
                                                     closed

              ODP487SX                    pins 2 & 3, 4 & 5, and 6 & 7
                                                     closed

               80486DX                    pins 1 & 2, 4 & 5, and 6 & 7
                                                     closed

               80487SX                         pins 5 & 6 closed

               80486SX                    pins 2 & 3, 4 & 5, and 6 & 7
                                                     closed

           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) 4M x 9         NONE

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

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

                    SRAM CONFIGURATION

     Size          Cache         Location         TAG

     32KB        (4) 8K x 8       Bank 0      (1) 8K x 8

     64KB        (8) 8K x 8    Banks 0 & 1    (1) 8K x 8

     128KB      (4) 32K x 8       Bank 0      (1) 32K x 8

     256KB      (8) 32K x 8    Banks 0 & 1    (1) 32K x 8

                         SRAM JUMPER CONFIGURATION

    Size        J17         J18         J19                J20

    32KB        open       open        open         pins 2 & 3 closed

    64KB        open      closed       open         pins 1 & 2 closed

   128KB        open      closed      closed       pins 1 & 2 and 3 & 4
                                                          closed

   256KB       closed     closed      closed       pins 1 & 2 and 4 & 5
                                                          closed