GENOA SYSTEMS CORPORATION

TURBOEXPRESS 486VL

Processor        80486SX/80487SX/80486DX/ODP486SX/80486DX2/80486DX3/

                 Pentium Overdrive
Processor Speed  20/25/33/40/50(internal)/50/66(internal)/99(internal)MHz
Chip Set         SIS
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      32-bit VESA local bus slots (3)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            JP1       Turbo switch              JP19

  Speaker                    JP15       32-bit VESA Local bus      S1
                                        slot

  Power LED & keylock        JP16       32-bit VESA Local bus      S2
                                        slot

  Reset switch               JP17       32-bit VESA Local bus      S3
                                        slot

  Turbo LED                  JP18

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Factory configured - do not             JP2              N/A
      alter

  »   Factory configured - do not             JP3              N/A
      alter

  »   Factory configured - do not             JP21             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

      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

       64KB           (4) 8K x 8        (4) 8K x 8         (1) 8K x 8

       128KB          (4) 32K x 8          NONE            (1) 8K x 8

       256KB          (4) 32K x 8      (4) 32K x 8       (1) 16K x 8/(1)
                                                            32K x 8

                  CACHE JUMPER CONFIGURATION

        Size                 JP11                JP12

        64KB                 Open                Open

        128KB          pins 1 & 2 closed        Closed

        256KB          pins 2 & 3 closed        Closed

                          CPU TYPE CONFIGURATION

           Type                      JP7                     JP8

          80486SX             pins 2 & 3 closed             Open

          80487SX            pins 1 & 2 and 3 & 4     pins 2 & 3 closed
                                   closed

          80486DX            pins 1 & 2 and 3 & 4     pins 1 & 2 closed
                                   closed

    ODP486SX (168 pin)       pins 1 & 2 and 3 & 4     pins 1 & 2 closed
                                   closed

    ODP486SX (169 pin)       pins 1 & 2 and 3 & 4     pins 2 & 3 closed
                                   closed

         ODP486SX2           pins 1 & 2 and 3 & 4     pins 2 & 3 closed
                                   closed

         80486DX2            pins 1 & 2 and 3 & 4     pins 1 & 2 closed
                                   closed

         80486DX3            pins 1 & 2 and 3 & 4     pins 1 & 2 closed
                                   closed

     Pentium Overdrive       pins 1 & 2 and 3 & 4     pins 2 & 3 closed
                                   closed

          CPU SPEED CONFIGURATION

   Speed      JP4        JP5        JP6

   20MHz     Closed     Closed     Open

   25MHz     Closed      Open     Closed

   33MHz      Open      Closed    Closed

   40MHz     Closed      Open      Open

  50i MHz    Closed      Open     Closed

   50MHz      Open      Closed     Open

  66i MHz     Open      Closed    Closed

  99i MHz     Open      Closed    Closed

              VESA WAIT STATE/BUS SPEED CONFIGURATION

    CPU Speed      Wait states          JP13            JP14

     £ 33MHz      0 wait states         Open            Open

     > 33MHz       1 wait state        Closed          Closed