
UNIDENTIFIED

OPTI495SLC VL-BUS 3/486

Processor        80386DX/CX486DLC/80486SX/80487DX/80486DX/80486DX2
Processor Speed  25/33/40/50(internal)/50/66(internal)MHz
Chip Set         OPTI
Max. Onboard DRAM64MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       230mm x 218mm
I/O Options      32-bit VESA local bus slots (2)
NPU Options      80387DX

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Turbo switch                J1       Reset switch                J5

  Power LED & keylock         J2       External battery            J6

  Speaker                     J3       32-bit VESA Local bus   SL1 & SL2
                                       slots

  Turbo LED                   J4

                        USER CONFIGURABLE SETTINGS

                 Function                     Jumper         Position

     Turbo mode enabled                        J1             Open

      Turbo mode disabled                       J1            Closed

     CMOS memory normal operation              J6           pins 2 & 3
      (Internal Battery)                                      closed

      CMOS memory clear                         J6           pins 3 & 4
                                                              closed

     Factory configured - do not alter        JP7              N/A

     Factory configured - do not alter        JP9              N/A

     Cyrix PQFP disabled                      JP10           Closed

      Cyrix PQFP enabled                       JP10            Open

     80386DX/80486SX PQFP disabled            JP16           Closed

      80386DX/80486SX PQFP enabled             JP16            Open

     Monitor type select monochrome           JP21            Open

      Monitor type select color                JP21           Closed

     Battery type select NI-CD recharge       JP29          pins 2 & 3
                                                              closed

      Battery type select Lithum               JP29          pins 1 & 2
      discharge                                               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

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

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

      64MB        (4) 16M x 9        NONE

                    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 x 8

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

                        CACHE JUMPER CONFIGURATION

   Size      JP13      JP17     JP18     JP20     JP24    JP27      JP28

   64KB      Open      Open    2 & 3    1 & 2     Open    Open      Open

  128KB      Open     Closed   1 & 2    2 & 3     Open    Open      Open

  256KB     Closed    Closed   2 & 3    1 & 2     Open    Open      Open

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

    CPU Type            JP12                JP14               JP15

      80386           pins 1 & 2         pins 1 & 2            Open
                       closed              closed

      80486           pins 2 & 3         pins 2 & 3           Closed
                       closed              closed

                      CPU TYPE CONFIGURATION (80486)

        Type                JP5               JP6              JP19

       80486SX              Open             Open            pins 2 & 3
                                                              closed

       80487SX           pins 2 & 3         Closed           pins 1 & 2
                           closed                             closed

     80486DX/DX2         pins 1 & 2         Closed           pins 1 & 2
                           closed                             closed

      Overdrive          pins 2 & 3         Closed           pins 1 & 2
                           closed                             closed

        CPU SPEED CONFIGURATION (80386DX & CX486DLC)

  Speed       JP1       JP2       JP3       JP4       JP22

  33MHz     Closed     Open      Closed    2 & 3      Open

  40MHz     Closed    Closed     Closed    2 & 3      Open

  Note: Pins designated should be in the closed position.

                 CPU SPEED CONFIGURATION (80486)

   Speed       JP1        JP2        JP3        JP4       JP22

   25MHz      Open       Open       Open       1 & 2     Closed

   33MHz      Open      Closed      Open       1 & 2      Open

   40MHz     Closed     Closed      Open       1 & 2      Open

  50iMHz      Open       Open       Open       1 & 2     Closed

   50MHz     Closed      Open       Open       1 & 2      Open

  66iMHz      Open      Closed      Open       1 & 2      Open

  Note: Pins designated should be in the closed position.

                          VESA CARD CONFIGURATION

                      Card Type                               JP23

       Use standard VESA card with (all CPUs)         pins 1 & 2 closed

   Use DC-680DT VGA, Tekram VESA cache IDE or other    pins 2 & 3 closed
            special card (486DX-50 only)

