UNIDENTIFIED

M-421

Processor              80486SX/80486DX/80486DX2
Processor Speed        25/33/50(internal)/66(internal)MHz
Chip Set               PC Chips
Video Chip Set         None
Maximum Onboard Memory 32MB
Maximum Video Memory   None
Cache                  None
BIOS                   AMI
Dimensions             220mm x 220mm
I/O Options            None
NPU Options            4167

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Speaker                     J1       Turbo switch                J4

  Power LED & keylock         J2       Reset switch                J5

  Turbo LED                   J3       External battery            JP4

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      Battery type select internal            JP4           Pins 2 & 3
                                                              closed

      Battery type select external            JP4              Open

      CMOS memory clear                       JP4           Pins 3 & 4
                                                              closed

  »   Monitor type select monochrome          JP5              Open

      Monitor type select color               JP5             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

      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

                      CPU TYPE SELECTION

        Type                 JP1                  JP2

       80486SX         Pins 1 & 2 closed          Open

       80486DX         Pins 2 & 3 closed   Pins 1 & 2 closed

      80486DX2         Pins 2 & 3 closed   Pins 1 & 2 closed

                               NPU SELECTION

  Note: To install a 4167 NPU, install the Math Coprocessor Daughterboard
  over the CPU socket.