UNIDENTIFIED

450L2 CACHE

Processor        80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed  20/25/33/50 (Internal)/50/66 (Internal)MHz
Chip Set         OPTI
Max. onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      32-bit local bus slots (2)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery             J1       Turbo LED                 JP10

  Speaker                     J17       32-bit local bus slot      S1

  Power LED & keylock         J18                                  S2

  Turbo switch                JP9       Reset                      SW1

  Note:The exact locations of local bus slots S1 and S2 are unknown.

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CMOS memory normal operation             JP1           pins 2 & 3
                                                              closed

      CMOS memory clear                        JP1           pins 1 & 2
                                                              closed

  »   Monitor type select color                JP2            Closed

      Monitor type select monochrome           JP2             Open

  »   Ready signal select ISA               JP3 & JP4        pins 1 & 2
                                                              closed

      Ready signal select Local bus         JP3 & JP4        pins 2 & 3
                                                              closed

  »   CPU upgrade (486PQFP to 486PGA)         JP17            Closed
      enabled

      CPU upgrade (486PQFP to 486PGA)         JP17             Open
      disabled

  Note:The location of jumpers JP3 and JP4 is 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

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

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1       TAG (U39)      TAG (U40)

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8        NONE

     128KB      (4) 32K x 8        NONE       (1) 8K x 8        NONE

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

                        CACHE JUMPER CONFIGURATION

   Size       JP5        JP6        JP7       JP8      JP15        JP16

   64KB      Open       Open       Open      pins 2    Open        Open
                                              & 3

  128KB     Closed      Open      Closed     pins 1    Open       Closed
                                              & 2

  256KB     Closed     Closed     Closed     pins 2   Closed      Closed
                                              & 3

               CPU SPEED CONFIGURATION

   Speed      JP11       JP12      JP13       JP14

   20MHz     Closed     Closed     Open       Open

   25MHz      Open      Closed     Open      Closed

   33MHz      Open       Open     Closed     Closed

  50i MHz     Open      Closed     Open      Closed

   50MHz      Open       Open     Closed      Open

   66MHz      Open       Open     Closed     Closed

                          CPU TYPE CONFIGURATION

       Type               JP18              JP19               JP20

   80486SX PQFP           Open             Closed           pins 2 & 3
                                                              closed

    80486SX PGA           Open              Open            pins 2 & 3
                                                              closed

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

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

     ODP486SX             Open              Open            pins 2 & 3
                                                              closed

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