
ZIDA TECHNOLOGIES, LTD.

OPTI 3486

Processor          80386DX/80486SX/80487SX/80486DX/80486DX2
Processor Speed    20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set           OPTI
Max. Onboard DRAM  32MB
SRAM Cache         64/128/256KB
BIOS               AMI
Dimensions         220mm x 220mm
I/O Options        None
NPU Options        None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Reset switch                J1       Speaker                     J4

  Turbo LED                   J3       Power LED & keylock         J5

  Note:The Locations of connectors J1, J3, J4, and J5 are unknown.

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not alter        P2             Unknown

              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

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

      16MB        (4) 4M x 9         NONE

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

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

                    SRAM 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

                         SRAM JUMPER CONFIGURATION

  Size        P3          P5        P6         P7        P8         P9

  64KB      pins 2 &     Open      Open       Open      Open       Open
           3 closed

  128KB     pins 1 &     Open      Open      Closed    Closed     Closed
           2 closed

  256KB     pins 2 &    Closed    Closed     Closed    Closed     Closed
           3 closed

                CONFIGURATION FOR 80386DX CPU

       Jumper               33MHz                40MHz

         P4            pins 1 & 2 closed   pins 1 & 2 closed

         P12                 N/A                  N/A

         P13                 N/A                  N/A

         P14                 N/A                  N/A

         P25           pins 2 & 3 closed   pins 2 & 3 closed

         P28                 Open                 Open

         P30                Closed                Open

         P31                Closed                Open

         P32                 Open                Closed

         P33                 Open                 Open

         P39                Closed                Open

         P97                Closed               Closed

        P100           pins 1 & 2 closed   pins 1 & 2 closed

             CONFIGURATION FOR 80486SX, 80486DX & 80486DX2 CPU

  Jumper    20MHz      25MHz      33MHz     50iMHz     50MHz      66iMHz

    P4     pins 2 &   pins 2 &   pins 2 &   pins 2 &  pins 2 &   pins 2 &
              3          3          3          3         3          3

   P12     pins 2 &   pins 2 &   pins 1 &   pins 1 &  pins 1 &   pins 1 &
              3          3          2          2         2          2

   P13       Open       Open     pins 1 &   pins 1 &  pins 1 &   pins 1 &
                                    2          2         2          2

   P14       Open       Open     Closed     Closed     Closed     Closed

   P25     pins 1 &   pins 1 &   pins 1 &   pins 1 &  pins 1 &   pins 1 &
              2          2          2          2         2          2

   P28      Closed     Closed    Closed     Closed     Closed     CLosed

   P30       Open      Closed    Closed     Closed     Closed     Closed

   P31      Closed      Open     Closed      Open       Open      Closed

   P32      Closed     Closed     Open      Closed     Closed      Open

   P33      Closed     Closed    Closed     Closed     Closed     Closed

   P39       N/A        N/A        N/A        N/A       N/A        N/A

   P97       Open       Open      Open       Open      Closed      Open

   P100    pins 2 &   pins 2 &   pins 2 &   pina 2 &  pins 2 &   pins 2 &
              3          3          3          3         3          3

  Note:Pins designated should be in the closed position.

  Location of jumpers P30, P31, P32 and P97 are unknown.

