EVEREX SYSTEMS, INC.

STEP ISA VL (EV-18211)

Processor         80486SX/80487SX/80486DX
Processor Speed   20/25/33/50MHZ
Chip Set          Compaq
Max. Onboard DRAM 32MB
Cache             64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit VESA local bus slots (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Turbo LED                  JP10      External battery           JP17

  Speaker                    JP11      Turbo switch               JP32

  Power LED & keylock        JP13      32-bit VESA Local bus       S1
                                       slot

  Reset switch               JP15      32-bit VESA Local bus       S2
                                       slot

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

  »   Factory configured - do not            JP1               Closed
      alter

  »   Fast gate A20 normal                   JP9             pins 2 & 3
      operation                                                closed

      Fast gate A20 select                   JP9             pins 1 & 2
      alternate                                                closed

  »   Monitor type select color              JP12              Closed

      Monitor type select                    JP12               Open
      monochrome

  »   CMOS memory normal operation           JP16            pins 1 & 2
                                                               closed

      CMOS memory clear                      JP16            pins 2 & 3
                                                               closed

  »   CPU select 2 wait states               JP29            pins 2 & 3
                                                               closed

      CPU select 1 wait state                JP29            pins 1 & 2
                                                               closed

  »   LCLK gate select 1 wait state          JP36            pins 1 & 2
                                                               closed

      LCLK gate select 2 wait state          JP36            pins 2 & 3
                                                               closed

  »   CPUADS select 0 wait states            JP38            pins 1 & 2
                                                               closed

      CPUADS select 1 wait state             JP38            pins 2 & 3
                                                               closed

  »   Factory configured - do not           JP100               Open
      alter

  »   Factory configured - do not           JP101               Open
      alter

  »   Factory configured - do not           JP102            pins 2 & 3
      alter                                                    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

     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) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size               JP6               JP7                 JP8

      64KB            pins 2 & 3        pins 2 & 3      pins 2 & 4 closed
                       closed             closed

      128KB           pins 2 & 3        pins 1 & 2      pins 2 & 3 closed
                       closed             closed

      256KB           pins 1 & 2        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

      VESA WAIT STATE/BUS SPEED (ID2 & ID3) CONFIGURATION

    CPU speed      Wait states          ID3              ID2

     £ 33MHz      0 wait states         Open            Open

     > 33MHz       1 wait state        Closed          Closed

         CPU SPEED CONFIGURATION

        Speed                JP30

        20MHz         pins 2 & 3 closed

        25MHz         pins 2 & 3 closed

        33MHz         pins 1 & 2 closed

        50MHz         pins 1 & 2 closed

                          CPU TYPE CONFIGURATION

     Type            JP2            JP3           JP4            JP5

    80486SX       pins 1 & 2       Open           Open           Open
                   closed

    80487SX       pins 2 & 3      Closed       pins 1 & 2       Closed
                   closed                        closed

    80486DX       pins 2 & 3      Closed       pins 2 & 3        Open
                   closed                        closed