POSITIVE CORPORATION

PC425

Processor              80486SX
Processor Speed        25MHz
Chip Set               Unidentified
Max. Onboard DRAM      5MB
Cache                  None
BIOS                   Unidentified
Dimensions             254mm x 218mm
I/O Options            Parallel port, serial ports (2), VGA port, floppy
                       drive interface, IDE interface, riser slot
NPU Options            None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Serial port 2               J2       External battery            J12

  Serial port 1               J3       Power/speed indicator       J17

  Parallel port               J4       VGA port                    J22

  Speaker                     J6       Riser Card                  SL1

  Floppy drive interface     J10       Reset switch                SW1

  IDE interface              J11

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch        Position

  »   Factory configured - do not            E1              pins 2 & 3
      alter                                                   closed

  »   IDE interface interrupt                E2              pins 1 & 2
      enabled                                                 closed

      IDE interface interrupt                E2                Open
      disabled

  »   Factory configured - do not            E3              pins 2 & 3
      alter                                                   closed

  »   Factory configured - do not            E4              pins 2 & 3
      alter                                                   closed

  »   Factory configured - do not            E5              pins 2 & 3
      alter                                                   closed

  »   Factory configured - do not            E8              pins 1 & 2
      alter                                                   closed

  »   Factory configured - do not            E9              pins 2 & 3
      alter                                                   closed

  »   Parity disabled                        E10             pins 2 & 3
                                                              closed

      Parity enabled                         E10             pins 1 & 2
                                                              closed

  »   Factory configured - do not            E11             pins 2 & 3
      alter                                                   closed

  »   Onboard RAM 256KB to 512KB            sw2/1               Off
      enabled

      Onboard RAM 256KB to 512KB            sw2/1               On
      disabled

  »   Onboard RAM 512KB to 640KB            sw2/2               Off
      enabled

      Onboard RAM 512KB to 640KB            sw2/2               On
      disabled

  »   Security enabled                      sw2/3               Off

      Security disabled                     sw2/3               On

  »   Factory configured - do not           sw2/4               Off
      alter

                            DRAM CONFIGURATION

          Size                    Bank 0                   Bank 1

           1MB                     1MB                      NONE

           5MB                     1MB                   (4) 1M x 9

  Note: Bank 0 is factory installed and is not configurable. The location
  is unidentified.

                      IDE CONFIGURATION

       Setting                E6                   E7

       Primary         pins 2 & 3 closed   pins 2 & 3 closed

      Secondary        pins 1 & 2 closed   pins 1 & 2 closed