
MICRO-STAR INTERNATIONAL CO., LTD.

VLB 486CT1

Processor      80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive
Processor      20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set       OPTI
Max. Onboard   32MB
DRAM
Cache          64/128/256KB
BIOS           AMI
Dimensions     330mm x 218mm
I/O Options    32-bit VESA local bus slots (2)
NPU Options    None

[Image]

                                CONNECTIONS

  Purpose                    Location   Purpose                  Location

  External keyboard            J2       Green PC                  JP38

  External battery             J4       32 Bit VESA slots        S1 & S2

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select monochrome          JP17             Open

      Monitor type select color               JP17            Closed

     Factory configured - do not             JP18            Closed
      alter

     Factory configured - do not             JP22          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP23          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP26          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP37          pins 1 & 2
      alter                                                   closed

                   PIN OUT CONFIGURATION

           Function                        J5

           Keylock                  pins 3 & 5 closed

          Power LED                 pins 1 & 2 closed

           Speaker             pins 7 , 8 , 9 & 10 closed

          Turbo LED                pins 12 & 13 closed

         Turbo switch            pins 15, 16 & 17 closed

         Reset switch              pins 19 & 20 closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 3

      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

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

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

      16MB        (4) 4M x 9         NONE

      17MB        (4) 256K x 9    (4) 4M x 9

      17MB        (4) 4M x 9     (4) 256K 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

                  CACHE CONFIGURATION

    Size         Bank 0        Bank 1          TAG

    64KB       (4) 8K x 8    (4) 8K x 8     (1) 8K x 8

    128KB      (4) 32K x 8      NONE           NONE

    256KB      (4) 32K x 8   (4) 32K x 8    (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size              JP1                JP6                 JP7

      64KB           pins 1 & 2         pins 2 & 3      pins 2 & 3 closed
                       closed             closed

     128KB           pins 2 & 3         pins 1 & 2      pins 2 & 3 closed
                       closed             closed

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

                          CPU TYPE CONFIGURATION

        Type               JP31              JP32              JP33

      80486SX           pins 3 & 4           Open        pins 2 & 3 , 4 &
                          closed                             5 closed

   80486SX (PQFP)          Open              Open           pins 1 & 2
                                                              closed

      80487SX         pins 2 & 3 , 4      pins 1 & 2     pins 2 & 3 , 4 &
                        & 5 closed          closed           5 closed

      80486DX         pins 2 & 3 , 4      pins 2 & 3     pins 2 & 3 , 4 &
                        & 5 closed          closed           5 closed

   80486DX (PQFP)       pins 1 & 2        pins 4 & 5        pins 1 & 2
                          closed            closed            closed

      ODP486SX        pins 2 & 3 , 4      pins 1 & 2     pins 2 & 3 , 4 &
                        & 5 closed          closed           5 closed

      80486DX2        pins 2 & 3 , 4      pins 2 & 3     pins 2 & 3 , 4 &
                        & 5 closed          closed           5 closed

  Pentium Overdrive   pins 2 & 3 , 4      pins 1 & 2     pins 2 & 3 , 4 &
                        & 5 closed          closed           5 closed

                          CPU SPEED CONFIGURATION

  Speed      OSC.         JP8           JP12         JP13         JP14

  20MHz      40MHz     pins 2 & 3      Closed       Closed        Open
                         closed

  25MHz      25MHz     pins 2 & 3       Open         Open        Closed
                         closed

  33MHz      33MHz     pins 1 & 2      Closed        Open         Open
                         closed

  50i MHz    25MHz     pins 2 & 3       Open         Open        Closed
                         closed

  50MHz      50MHz     pins 1 & 2       Open        Closed        Open
                         closed

  66i MHz    33MHz     pins 1 & 2      Closed        Open         Open
                         closed

              VESA WAIT STATE/BUS SPEED CONFIGURATION

    CPU speed      Wait states          JP19            JP20

      33MHz      0 wait states         Open            Open

     > 33MHz       1 wait state        Closed          Closed

