VTECH INDUSTRIES, INC.

486 SERIES (MINI CASE) ASIC II (3 VESA SLOTS)

Processor        80486SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive
Processor Speed  25/33/50(internal)/66(internal)MHz
Chip Set         Unidentified
Max. Onboard DRAM32MB
Cache            128/256KB
BIOS             Unidentified
Dimensions       330mm x 218mm
I/O Options      32-bit VESA local bus slots (3), PS/2 mouse connector
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Front panel connector       J1       PS/2 mouse connector       J27

  External battery            J3       Speaker                    J29

  Processor power            J10       32-bit VESA local bus   SL1 - SL3
  connector                            slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Battery type select internal             JP8           pins 1 & 2
                                                              closed

      Battery type select external             JP8           pins 2 & 3
                                                              closed

  »   VESA card select supports write         JP10           pins 1 & 2
      back cache                                              closed

      VESA card select does not support       JP10           pins 2 & 3
      write back cache                                        closed

  »   Factory configured - do not alter       JP14           pins 1 & 2
                                                              closed

  »   Monitor type select CGA/EGA/VGA         JP19            Closed

      Monitor type select MDA/EGA/VGA         JP19             Open

  »   CMOS memory normal operation            JP20           pins 1 & 2
                                                              closed

      CMOS memory clear                       JP20           pins 2 & 3
                                                              closed

  »   Mouse IRQ12 disabled                    JP21             Open

      Mouse IRQ12 enabled                     JP21            Closed

  »   CPU type select all                     JP32             Open

      CPU type select Pentium Overdrive       JP32           pins 2 & 3
                                                              closed

  »   Factory configured - do not alter       JP33           pins 1 & 2
                                                              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

                            CACHE CONFIGURATION

     Size          Bank 0        Bank 1      TAG (Bank 0)   TAG (Bank 1)

     128KB       (4) 32K x 8      NONE        (2) 8K x 8     (2) 8K x 8

     256KB       (4) 32K x 8   (4) 32K x 8    (2) 8K x 8     (2) 8K x 8

        CACHE JUMPER CONFIGURATION

        Size                 JP2

        128KB         pins 1 & 2 closed

        256KB         pins 2 & 3 closed

                         CPU UPGRADE CONFIGURATION

                 Type                                  JP1

            None installed                      pins 1 & 2 closed

      SX/DX/DX2 series installed            pins 2 & 3, 4 & 5 closed

      Overdrive series installed            pins 1 & 2, 5 & 6 closed

            Note: There is a PQFP CPU installed but the location is
            unidentified. These CPU types are installed in the PGA
            socket.

                CPU SPEED CONFIGURATION

           Speed                       JP13

           25MHz                 pins 5 & 6 closed

           33MHz             pins 1 & 2, 3 & 4 closed

           50iMHz                pins 5 & 6 closed

           66iMHz            pins 1 & 2, 3 & 4 closed

         CPU SPEED CONFIGURATION

        Speed                JP11

         2x           pins 1 & 2 closed

        2.5x          pins 2 & 3 closed

         3x                  Open

         BUS SPEED CONFIGURATION

      CPU speed              JP9

      <= 33MHz        pins 1 & 2 closed

       > 33MHz        pins 2 & 3 closed

                       KEYBOARD CONFIGURATION

    Type       JP12        JP15       JP16        JP17       JP18

  Internal     1 & 2      1 & 2       1 & 2       1 & 2      1 & 2

  External     2 & 3      2 & 3       2 & 3       2 & 3      2 & 3

  Note: Pins designated should be in the closed position.