VTECH INDUSTRIES, INC.

LASER 386SX/2, 386SX/3

Device Type                Mainboard
Processor                  80386SX
Processor Speed            16/20/25MHz
Chip Set                   Unidentified
Video Chip Set             None
Maximum Onboard Memory     4MB
Maximum Video Memory       None
Cache                      None
BIOS                       Unidentified
Dimensions                 305mm x 244mm
I/O Options                Floppy drive interface, game port, IDE
                           interface, serial ports (2), parallel port
NPU Options                80387SX

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Parallel port               CN1      IDE interface               J10

  Game port                   CN2      Floppy drive interface      J12

  Serial port                 CN3      Speaker                     J15

  Serial port                 CN4      IDE interface LED          JP32

  Front panel connector       J4       Riser slot                  SL1

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

  »   Factory configured - do not           J1           Unidentified
      alter

  »   Factory configured - do not           J2           Unidentified
      alter

  »   Factory configured - do not          JP17          Unidentified
      alter

      Floppy drive interface enabled       JP28              Open

      Floppy drive interface               JP28             Closed
      disabled

      IDE interface enabled                JP29             Closed

      IDE interface disabled               JP29              Open

      Parity enabled                       JP33             Closed

      Parity disabled                      JP33              Open

      NPU not installed                    JP40        Pins 1 & 2 closed

      NPU installed                        JP40        Pins 2 & 3 closed

      Interleave mode enabled              JP42        Pins 1 & 2 closed

      Interleave mode disabled             JP42        Pins 2 & 3 closed

  Note: The location of JP28 is unidentified.

                           MEMORY CONFIGURATION

     Size          Bank 0        Bank 1         Bank 2          Bank 3

     1MB           44256          44256          None            None

    1.5MB          44256          44256       (2) 256K x 9       None

   2MB (A)         44256          44256       (2) 256K x 9   (2) 256K x 9

   2MB (B)          None          None        (2) 1M x 9         None

     4MB            None          None        (2) 1M x 9      (2) 1M x 9

  Note: The number of 44256 chips is unidentified. Parity chips are 4464.
  The location and amount of chips used is unidentified.

                  MEMORY SWITCH CONFIGURATION

   Size      SW1/1      SW1/2     SW1/3      SW1/4     SW1/5

    1MB        On        On         On        Off        On

   1.5MB       On        On         On        Off        On

  2MB (A)      On        On         On        Off        On

  2MB (B)      On        Off       Off        Off        On

    4MB        On        Off       Off        Off        On

  Note: The location of the switch is unidentified.

               MEMORY SWITCH CONFIGURATION (CON’T)

   Size       SW1/6      SW1/7      SW1/8      SW1/9     SW1/10

    1MB        On         Off        On         On        Off

   1.5MB       On         Off        On         Off        On

  2MB (A)      On         Off        On         Off       Off

  2MB (B)      On         Off        On         On         On

    4MB        On         Off        On         On        Off

  Note: The location of the switch is unidentified.

                      SERIAL PORT INTERRUPT SELECTION

             IRQ                JP18        JP19       JP20       JP22

  25-pin port as COM1, IRQ4.    1 & 2      2 & 3      2 & 3       1 & 2
    9-pin port COM2, IRQ3

  25-pin port as COM2, IRQ3.    2 & 3      1 & 2      1 & 2       2 & 3
    9-pin port COM1, IRQ4

            Note: Pins designated should be in the closed position. JP25
            & JP26 are used to set 3E8 and 2E8. The configuration is
            unidentified.

              PARALLEL PORT INTERRUPT SELECTION

         IRQ                 JP16                 JP21

        IRQ7           Pins 2 & 3 closed   Pins 1 & 2 closed

        IRQ5           Pins 1 & 2 closed   Pins 2 & 3 closed

      Disabled               Open                 Open