
COMPUTREND SYSTEMS, INC.

CONTAQ SINGLE CHIP 486 (MS-4125)

Processor      80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive
Processor      25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set       Contaq
Max. Onboard   32MB
DRAM
Cache          64/128/256KB
BIOS           AMI
Dimensions     260mm x 220mm
I/O Options    32-bit VESA local bus slots (2)
NPU Options    None

[Image]

                                CONNECTIONS

  Purpose                 Location      Purpose               Location

  Auxiliary keyboard         J2         Turbo LED           J5 pins 12 &
  connector                                                      13

  External battery           J4         Turbo switch        J5 pins 15 -
                                                                 17

  Power LED & keylock    J5 pins 1 -    Reset switch        J5 pins 19 &
                              5                                  20

  Speaker                J5 pins 7 -    32-bit VESA          SL1 & SL2
                             10         local bus slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Battery type select internal             J4           pins 2 & 3
                                                              closed

      Battery type select external             J4             Closed

     Monitor type select monochrome          JP17             Open

      Monitor type select color               JP17            Closed

     Factory configured - do not             JP23          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP26          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP37          pins 1 & 2
      alter                                                   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

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

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

      16MB        (4) 4M x 9         NONE

      17MB        (4) 4M x 9     (4) 256K x 9

      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

                    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               JP1               JP6                 JP7

      64KB            pins 1 & 2        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

      128KB           pins 2 & 3        pins 1 & 2      pins 2 & 3 closed
                       closed             closed

      256KB           pins 4 & 5        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

                          CPU TYPE CONFIGURATION

        Type               JP31              JP32              JP33

   80486SX (PQFP)          Open              Open            pins 1 & 2
                                                              closed

   80486SX (PGA)        pins 3 & 4           Open         pins 2 & 3, 4 &
                          closed                             5 closed

      ODP486SX        pins 2 & 3, 4 &     pins 1 & 2      pins 2 & 3, 4 &
                         5 closed           closed           5 closed

      80487SX         pins 2 & 3, 4 &     pins 1 & 2      pins 2 & 3, 4 &
                         5 closed           closed           5 closed

   80486DX (PQFP)       pins 1 & 2        pins 4 & 5         pins 1 & 2
                          closed            closed            closed

   80486DX (PGA)      pins 2 & 3, 4 &     pins 2 & 3      pins 2 & 3, 4 &
                         5 closed           closed           5 closed

      80486DX2        pins 2 & 3, 4 &     pins 2 & 3      pins 2 & 3, 4 &
                         5 closed           closed           5 closed

  Pentium Overdrive   pins 2 & 3, 4 &     pins 1 & 2      pins 2 & 3, 4 &
                         5 closed           closed           5 closed

         CPU SPEED CONFIGURATION

  Speed      JP12      JP13      JP14

  25MHz      Open      Open     Closed

  33MHz     Closed     Open      Open

  40MHz     Closed    Closed     Open

  50iMHz     Open      Open     Closed

  50MHz      Open     Closed     Open

  66iMHz    Closed     Open      Open

      CPU CLOCK SPEED CONFIGURATION

        Speed                JP8

        20MHz         pins 2 & 3 closed

        25MHz         pins 2 & 3 closed

        33MHz         pins 1 & 2 closed

  VESA WAIT STATE CONFIGURATION

   Wait states         JP19

  0 wait states        Open

  1 wait state        Closed

  BUS SPEED CONFIGURATION

  CPU speed        JP20

   <= 33MHz        Open

   > 33MHz        Closed

                         VESA CARD CONFIGURATION

          Type                     JP18                     JP22

  Normal card installed           Closed             pins 1 & 2 closed

    Weitek P9000 only              Open              pins 2 & 3 closed

