VISIONEX

CLT486VL2 486AT MOTHERBOARD

MSI 486VL2 486 VESA L.B. / ISA

Processor              80486SX/80487SX/ODP486/80486DX/80486DX2
Processor Speed        20/25/33/50(internal)/50/66(internal)MHz
Chip Set               Unidentified
Video Chip Set         None
Maximum Onboard Memory 32MB
Maximum Video Memory   None
Cache                  64/128/256KB
BIOS                   AMI
Dimensions             254mm x 218mm
I/O Options            32-bit VESA local bus slots (2)
NPU Options            None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Turbo LED                  JP10      External battery           JP17

  Speaker                    JP11      Turbo switch               JP95

  Power LED & keylock        JP13      32-bit VESA local bus   SL1 & SL2
                                       slots

  Reset switch               JP15

                        USER CONFIGURABLE SETTINGS

                 Function                      Label         Position

      PQFP CPU disabled                         JP1           Closed

      PQFP CPU enabled                          JP1            Open

      Monitor type select CGA/EGA/PGA/VGA      JP12           Closed

      Monitor type select monochrome           JP12            Open

  »   CMOS memory normal operation             JP16          Pins 1 & 2
                                                              closed

      CMOS memory clear                        JP16          Pins 2 & 3
                                                              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

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

      20MB        (4) 1M x 9      (4) 4M 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         (1) 8K/32K x 8

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

                  CACHE JUMPER CONFIGURATION

        Size                 JP7                  JP8

        64KB           Pins 2 & 3 closed   Pins 2 & 4 closed

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

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

                            CPU SPEED SELECTION

      Speed              ID3                JP33               JP72

      20MHz              Open            Pins 2 & 4           Closed
                                           closed

      25MHz              Open            Pins 2 & 4           Closed
                                           closed

      33MHz              Open            Pins 2 & 4            Open
                                           closed

      50iMHz             Open            Pins 2 & 4           Closed
                                           closed

      50MHz             Closed           Pins 1 & 2            Open
                                           closed

      66iMHz             Open            Pins 2 & 4            Open
                                           closed

  Note: Pins designated should be in the closed position.

                            CPU TYPE SELECTION

       Type               JP2                JP3                JP4

  80486SX (PQFP)          Open               Open              Open

   80486SX (PGA)       Pins 2 & 3            Open              Open
                         closed

      80487SX        Pins 1 & 2, 3 &      Pins 1 & 2          Closed
                        4 closed            closed

      ODP486         Pins 1 & 2, 3 &      Pins 1 & 2           Open
                        4 closed            closed

      80486DX        Pins 1 & 2, 3 &      Pins 2 & 3           Open
                        4 closed            closed

     80486DX2        Pins 1 & 2, 3 &      Pins 2 & 3           Open
                        4 closed            closed

  Note: The location of the PQFP is unidentified.

  VL BUS WAIT STATE SELECTION

    Setting           ID2

       0              Open

       1             Closed