VTECH INDUSTRIES, INC.

486 SERIES (MINI CASE - ASIC II)

Processor         80486SX/80486DX/80486DX2
Processor Speed   25/33/50(internal)/66(internal)MHz
Chip Set          Unidenitifed
Max. Onboard DRAM 32MB
Cache             128KB
BIOS              Unidenitifed
Dimensions        330mm x 218mm
I/O Options       32-bit VESA local bus slots (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  External battery           J3       Front panel connector       J21

  Speaker                    J4       32-bit VESA local bus    SL1 & SL1
                                      slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Factory configured - do not             JP1              N/A
      alter

  »   Factory configured - do not             JP3              Open
      alter

  »   Factory configured - do not             JP10          pins 1 & 2
      alter                                                   closed

  »   CMOS memory normal operation            JP11          pins 1 & 2
                                                              closed

      CMOS memory clear                       JP11          pins 2 & 3
                                                              closed

  »   Battery type select internal            JP12          pins 1 & 2
                                                              closed

      Battery type select external            JP12          pins 2 & 3
                                                              closed

  »   VESA card select does not               JP14          pins 1 & 2
      support write back cache                                closed

      VESA card select supports write         JP14          pins 2 & 3
      back cache                                              closed

  »   Factory configured - do not             JP15             N/A
      alter

  »   Factory configured - do not             JP19             N/A
      alter

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      2MB         (4) 512K x 9       NONE

      4MB         (4) 512K x 9   (4) 512K 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          TAG

     128KB       (4) 32K x 8   (2) 8K x 8

     128KB       (4) 32K x 9   (2) 8K x 9

                        CACHE JUMPER CONFIGURATION

   Size          JP5             JP6            JP7             JP8

  32K x 8     pins 1 & 2      pins 1 & 2     pins 1 & 2      pins 1 & 2
                closed         closed          closed          closed

  32K x 9     pins 2 & 3      pins 2 & 3     pins 2 & 3      pins 2 & 3
                closed         closed          closed          closed

                         CPU UPGRADE CONFIGURATION

                  Type                                  JP2

             None installed                  pins 1 & 2, 4 & 5 closed

     80486SX/DX/DX2 series installed         pins 2 & 3, 4 & 5 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      JP16      JP17      JP18

  25MHz      Open      Open     Closed

  33MHz     Closed    Closed     Open

  50iMHz     Open      Open     Closed

  66iMHz    Closed    Closed     Open

                          BUS SPEED CONFIGURATION

    CPU speed             JP4               JP13               JP20

     <= 33MHz          pins 2 & 3        pins 1 & 2            Open
                        closed             closed

     > 33MHz           pins 1 & 2        pins 2 & 3           Closed
                        closed             closed