
UNIDENTIFIED

A351 386SX

Processor              80386SX
Processor Speed        16/20MHz
Chip Set               UMC
Max. onboard DRAM      4MB
Cache                  None
BIOS                   AMI
Dimensions             330mm x 220mm
I/O Options            Floppy drive interface, game port, IDE interface,
                       parallel port, serial ports (2), VGA feature
                       connector
NPU Options            80387SX

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  External battery            J1       Floppy drive interface      P2

  Speaker                     J2       IDE interface               P3

  Power LED & keylock         J3       VGA feature connector       P4

  Turbo switch                J4       Serial port 2             Unknown

  Reset switch                J5       Serial port 1             Unknown

  IDE interface LED           J6       Parallel port             Unknown

  Turbo LED                   J7       Game port                 Unknown

  Note:J4 might not be available on future boards.

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     Onboard VGA enabled                    JP2             pins 1 & 2
                                                               closed

      Onboard VGA disabled                   JP2             pins 2 & 3
                                                               closed

     Monitor type select CGA                JP3               Closed

      Monitor type select                    JP3                Open
      monochrome

     Factory configured - do not            JP4                Open
      alter

     Battery select internal                JP5               Closed

      Battery select 6V external             JP5                Open

     Monitor type select color             SW1/3               Off

      Monitor type select                   SW1/3                On
      monochrome

     Floppy drive interface (P2)           SW1/4               Off
      enabled

      Floppy drive interface (P2)           SW1/4                On
      disabled

     Parallel port select LPT1             SW1/5               Off
      (378-37Fh)

      Parallel port select LPT2             SW1/5                On
      (278-27Fh)

     IDE interface (P3) enabled            SW1/6               Off

      IDE interface (P3) disabled           SW1/6                On

     Game port enabled                     SW1/7               Off

      Game port disabled                    SW1/7                On

     NPU synchronous with CPU              SW1/8               Off

      NPU asynchronous with CPU             SW1/8                On

     CMOS memory normal operation            P1                Open

      CMOS memory clear                       P1               Closed

  Note: If an EGA or VGA monitor is installed, JP3 can be on either
  setting.

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

     512KB        (2) 256K x 9       None

      1MB         (2) 256K x 9   (2) 256K x 9

      2MB         (2) 1M x 9         None

      4MB         (2) 1M x 9      (2) 1M x 9

                        MONITOR TYPE CONFIGURATION

       MonitorType         SW2/1     SW2/2     SW2/3    SW2/4      SW2/5

           CGA              On        On        On        On        On

           MDA              Off       On        On        On        On

       Pure MDA (no         On        Off       On        On        On
       emulation)

           EGA              Off       Off       On        On        On

       Pure EGA (no         On        On        Off       On        On
       emulation)

        VGA Color           Off       On        Off       On        On

        VGA Mono            On        Off       Off       On        On

          8514              Off       Off       Off       On        On

   NEC 2A (640 x 480)       On        On        On       Off        On

         NEC/NEC+           Off       On        On       Off        On
    (multifrequency)

   NEC XL (1024 x 768)      On        Off       On       Off        On

   NEC 3D (1024 x 768)      Off       Off       On       Off        On

   NEC4D/NEC5D (1024 x      On        On        Off      Off        On
          768)

        Portrait            Off       On        Off      Off        On

  Note:SW2/5 on = interlaced display. For non-interlaced display this
  setting should be in the Off position.

                     SERIAL PORT CONFIGURATION

  Serial port 1   Serial port 2     SW1/switch 2    SW1/switch 2

      COM1             COM2             Off              Off

      COM1           Disabled           Off              Off

    Disabled           COM2              On              On

    Disabled         Disabled            On              On

