
PEAKTRON COMPUTER, INC.

486DX-25/33, 486SX-20

Processor         80486SX/80486DX
Processor Speed   20/25/33MHz
Chip Set          Peaktron
Max. Onboard DRAM 32MB
Cache             None
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Reset switch                J1       Speaker                     J4

  Turbo switch                J2       Power LED & Keylock         J5

  Turbo LED                   J3       External battery            JP4

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     Parity check enabled                    J6               Closed

      Parity check disabled                   J6                Open

     Factory configured - do not             J8                N/A
      alter

     Monitor type select                    J10                Open
      monochrome

      Monitor type select color              J10               Closed

     CPU speed select switchable            JP1             pins 1 & 2
      at turbo switch                                          closed

      CPU speed select forced fast           JP1             pins 2 & 3
                                                               closed

      CPU speed select forced slow           JP1                Open

     Factory configured - do not            JP5                N/A
      alter

     20/25MHz CPU using 70ns DRAM           JP6                Open
      or33MHz CPU using 60ns

      20/25MHz CPU using 60ns DRAM           JP6               Closed

     Shadow BIOS disabled                  SW1/5              Closed

      Shadow BIOS enabled                   SW1/5               Open

     Bus speed select ATCLK/3              SW1/6               Open

      Bus speed select ATCLK/4              SW1/6              Closed

  Note:Location of JP6 is unverified. If using 8 bit SIMMs, J6 must be
  open.

              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

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

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

                         DRAM JUMPER CONFIGURATION

  Size        SW1/1           SW1/2            SW1/3            SW1/4

  1MB        Closed            Open             Open           Closed

  2MB         Open             Open             Open           Closed

  4MB        Closed           Closed            Open            Open

  5MB         Open            Closed            Open           Closed

  8MB         Open            Closed            Open            Open

  16MB       Closed            Open             Open            Open

  20MB        Open             Open            Closed           Open

  32MB        Open             Open             Open            Open

                        CPU TYPE CONFIGURATION

   Type                 JP2                           JP3

  80486SX        pins 2 & 3 closed                   Open

  80486DX        pins 1 & 2 closed                  Closed

                   BIOS CONFIGURATION

  Type             J7                       J9

  27256           Open              pins 1 & 2 closed

  27512          Closed             pins 2 & 3 closed

