
INFOMATIC POWER SYSTEMS CORPORATION

OPTI-495SX 3/486WB CACHE

Processor            80386DX/80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed      25/33/40/50(internal)/50/66(internal)MHz
Chip Set             OPTI
Max. Onboard DRAM    32MB
Cache                64/128/256KB
BIOS                 AMI
Dimensions           254mm x 218mm
I/O Options          32-bit VESA local bus slot (Non-functional)
NPU Options          80387

[Image]

                             CONNECTIONS

  Purpose               Location    Purpose                Location

  Power LED & keylock      J1       Reset switch              J5

  Speaker                  J2       External battery         JP18

  Turbo switch             J3       32-bit VESA card          S1

  Turbo LED                J4

                        USER CONFIGURABLE SETTINGS

               Function                     Jumper          Position

     Factory configured - do not            JP8             unknown
      alter

     Factory configured - do not            JP9             unknown
      alter

     Factory configured - do not            JP10            unknown
      alter

     Factory configured - do not            JP11            unknown
      alter

     Monitor type select color              JP17            closed

      Monitor type select monochrome         JP17             open

     CMOS memory normal operation           JP18       pins 2 & 3 closed

      CMOS memory clear                      JP18       pins 3 & 4 closed

      External battery select                JP18           connected

     Factory configured - do not            JP23             open
      alter

                        CACHE JUMPER CONFIGURATION

     Size          JP6            JP7           JP12            JP13

     64KB          open           open          open          pins 2 & 3
                                                               closed

    128KB          open          closed        closed         pins 1 & 2
                                                               closed

    256KB         closed         closed        closed         pins 2 & 3
                                                               closed

                    CACHE CONFIGURATION

     Size          Cache         Location         TAG

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

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

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

              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) 1 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

                          CPU MODE CONFIGURATION

     Mode         JP3        JP5         JP20         JP21        JP24

  486 (PQFP)    pins 1 &   pins 2 &      open         N/A        pins 2 &
                   2          3                                     3

  486 (PGA)     pins 1 &   pins 2 &     closed       closed      pins 2 &
                   2          3                                     3

  386 (PQFP)    pins 2 &   pins 1 &      N/A          open       pins 1 &
                   3          2                                     2

                       CPU TYPE CONFIGURATION (PQFP)

        Type              JP14          JP22         JP51         JP52

    80486SX-33MHz       pins 1 & 2      N/A          open        closed
                         closed

    80486SX-25MHz       pins 1 & 2      N/A         closed        open
                         closed

    80386DX-40MHz       pins 2 & 3      open         open         open
                         closed

    80386DX-33MHz       pins 2 & 3     closed        open        closed
                         closed

                       CPU TYPE CONFIGURATION (PGA)

       Type            JP1      JP2     JP4    JP14     JP51       JP52

  80486DX2-66MHz     closed     pins    pins    pins    open      closed
                               1 & 2   1 & 2   1 & 2

  80486DX2-50MHz     closed     pins    pins    pins   closed      open
                               1 & 2   1 & 2   1 & 2

  ODP486SX-33MHz     closed     pins    pins    pins    open      closed
                               1 & 2   2 & 3   1 & 2

  ODP486SX-25MHz     closed     pins    pins    pins   closed      open
                               1 & 2   2 & 3   1 & 2

   80486DX-50MHz     closed     pins    pins    pins   closed      open
                               1 & 2   1 & 2   2 & 3

   80486DX-33MHz     closed     pins    pins    pins    open      closed
                               1 & 2   1 & 2   1 & 2

   80486DX-25MHz     closed     pins    pins    pins   closed      open
                               1 & 2   1 & 2   1 & 2

   80487SX-33MHz     closed     pins    pins    pins    open      closed
                               1 & 2   2 & 3   1 & 2

   80487SX-25MHz     closed     pins    pins    pins   closed      open
                               1 & 2   2 & 3   1 & 2

   80486SX-33MHz      open      pins   open     pins    open      closed
                               2 & 3           1 & 2

   80486SX-25MHz      open      pins   open     pins   closed      open
                               2 & 3           1 & 2

