
ATLANTIC COMPUTER PRODUCTS, INC.

486 CONTAQ CACHE

Processor        80486SX/80487SX/80486DX/80486DX2
Processor Speed  20/25/33/50(internal)/50/66(internal)MHz
Chip Set         Contaq
Max. onboard DRAM32MB
SRAM Cache       64/256KB
BIOS             AMI
Dimensions       238mm x 220mm
I/O Options      32-bit VESA local bus slot
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  External battery           JP5       Speaker                    JP33

  Turbo switch               JP30      Power LED & keylock        JP34

  Turbo LED                  JP31      32-bit VESA local bus       S1
                                       slot

  Reset switch               JP32

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

     Monitor type select color                JP1            Closed

      Monitor type select monochrome           JP1             Open

     CMOS memory normal operation             JP6           pins 1 & 2
                                                              closed

      CMOS memory clear                        JP6           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

      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

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

                        CACHE JUMPER CONFIGURATION

    Size          JP11          JP12            JP13            JP41

    64KB          Open          Open            Open          pins 2 & 3
                                                               closed

   256KB         Closed        Closed        pins 1 & 2       pins 2 & 3
                                               closed          closed

                          CPU TYPE CONFIGURATION

   CPU Type          JP2            JP3            JP7           JP8

    80486SX         Open         pins 1 & 2       Open           Open
                                   closed

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

    80486DX       pins 2 & 3     pins 2 & 3       Open          Closed
                   closed          closed

   80486DX2       pins 2 & 3     pins 2 & 3       Open          Closed
                   closed          closed

                                          CPU SPEED CONFIGURATION

         CPU               OSC1         JP15 Type A      JP15 Type B         JP22              JP23

          20MHz            40MHz         pins 3 & 4      pins 2 & 3          Open              Open

          25MHz            25MHz         pins 2 & 4      pins 2 & 4         Closed             Open

          33MHz            33MHz         pins 2 & 4      pins 2 & 4          Open             Closed

         50i MHz           25MHz         pins 2 & 4      pins 2 & 4         Closed             Open

          50MHz            50MHz         pins 2 & 4      pins 2 & 4         Closed            Closed

         66i MHz           33MHz         pins 2 & 4      pins 2 & 4          Open             Closed

      [Image]

  Note: Check the system board to determine if JP15 is type A or type B.

  Pins designated should be in the closed position.

                           CHIPSET CONFIGURATION

   Chipset           Mode              LJ4          LJ5           LJ6

    82C591     Synchronous mode     pins 2 & 3     Closed        Open
                                     closed

    82C591     Asynchronous mode    pins 1 & 2      Open         Open
                                     closed

   82C591A     Synchronous mode     pins 2 & 3      Open        Closed
                                     closed

   82C591A     Asynchronous mode    pins 1 & 2      Open         Open
                                     closed

       VESA WAIT STATE (ID2) CONFIGURATION

   Wait states      CPU speed        LJ1 (ID2)

  0 wait states        33MHz           Open

  1 wait state        > 33MHz          Closed

  VESA BUS SPEED (ID3) CONFIGURATION

     CPU speed          LJ2 (ID3)

       33MHz              Open

      > 33MHz             Closed

                VESA ID4 CONFIGURATION

          Setting                  LJ3 (ID4)

  Reserved for future use            Closed

