
COMPUTREND SYSTEMS, INC.

ALI 486 NONCACHE

Processor         80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed   16/20/25/33/50(internal)/66(internal)
Chip Set          ALI
Max. Onboard DRAM 32MB
SRAM Cache        None
BIOS              AMI
Dimensions        220mm x 220mm
I/O Options       Auxiliary keyboard connector
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                Location      Purpose               Location

  Auxiliary                 J1         Turbo switch       J4/pins 15 - 17
  keyboard

  Power LED &         J4/pins 1 - 5    Turbo LED          J4/pins 12 & 13
  keylock

  Speaker             J4/pins 7 - 10   External battery         J3

  Reset switch         J4/pins 19 &
                            20

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper          Position

     CMOS memory normal operation            J3            connected

      CMOS memory clear                       J3            pins 3 & 4
                                                             closed

     Factory configured - do not             JP1             open
      alter

     Monitor type select monochrome          JP2           pins 1 & 2
                                                             closed

      Monitor type select color               JP2           pins 2 & 3
                                                             closed

                         CPU JUMPER CONFIGURATION

     CPU       Location       JP3       JP4      JP5      JP6       JP7

  80486DX2        PGA         open     pins 2   pins 2   pins 2    pins 2
                                        & 3      & 3      & 3       & 3

  ODP486SX        PGA         open     pins 2   pins 2   pins 1    pins 2
                                        & 3      & 3      & 2       & 3

   80486DX        PGA         open     pins 2   pins 2   pins 2    pins 2
                                        & 3      & 3      & 3       & 3

   80487SX        PGA         open     pins 2   pins 2   pins 1    pins 2
                                        & 3      & 3      & 2       & 3

   80486SX       PQFP        closed    pins 1   pins 1    open     pins 1
                                        & 2      & 2                & 2

  Note:Pins designated should be in the closed position.

                     CPU SPEED/BUS SPEED CONFIGURATION

  CPU Speed     Bus Clock      JP8         JP9        JP10        JP11

    16MHz         SYS/4      pins 2 &    pins 2 &    pins 1 &    pins 2 &
                                3           3           2           3

    20MHz         SYS/5      pins 2 &    pins 1 &    pins 1 &    pins 2 &
                                3           2           2           3

    25MHz         SYS/6      pins 1 &    pins 2 &    pins 1 &    pins 2 &
                                2           3           2           3

    33MHz         SYS/8      pins 1 &    pins 1 &    pins 1 &    pins 2 &
                                2           2           2           3

    40MHz         SYS/5      pins 2 &    pins 1 &    pins 2 &    pins 1 &
                                3           2           3           2

  Note:Pins designated should be in the closed position.

              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

