
EVEREX SYSTEMS, INC.

STEP PLUS 486 (EV-18216)

Processor       80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed 25/33/40/50(internal)/50/66(internal)MHz
Chip Set        Unidentified
Max. Onboard    64MB
DRAM
Cache           64/128/256KB
BIOS            Unidentified
Dimensions      330mm x 218mm
I/O Options     Floppy drive interface, IDE interface, SCSI connector,
                parallel port, serial ports (2), VGA port, microphone
                port, LAN port, CD-ROM auxiliary in, riser slot
NPU Options     None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  LAN port                    CN1      Power LED                   J4

  Serial port 2               CN2      IDE interface LED           J5

  Parallel port               CN3      Keylock                     J6

  Microphone port             CN4      Speaker                     J7

  Speaker port                CN5      IDE interface               J9

  Serial port 1               CN6      SCSI interface              J10

  Floppy drive interface      CN7      CD-ROM auxiliary in         J14

  Speaker button              J1       VGA port                    J15

  Reset switch                J2       Riser slot                  SL1

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     CMOS memory normal operation             JP5             Open

      CMOS memory clear                        JP5            Closed

     On board VGA IRQ9 disabled               JP8             Open

      On board VGA IRQ9 enabled                JP8            Closed

     IDE interface enabled                    JP9            Closed

      IDE interface disabled                   JP9             Open

     SCSI IRQ select IRQ12                   JP12           pins 2 & 3
                                                              closed

      SCSI IRQ select IRQ10                   JP12           pins 1 & 2
                                                              closed

     Parallel port IRQ select IRQ7           JP14           pins 1 & 2
                                                              closed

      Parallel port IRQ select IRQ5           JP14           pins 2 & 3
                                                              closed

     Flash BIOS normal mode                   SW1              On

      Flash BIOS programming mode              SW1              Off

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (1) 256K x        NONE           NONE           NONE
                    36

     2MB        (1) 512K x        NONE           NONE           NONE
                    36

     3MB        (1) 512K x     (1) 256K x        NONE           NONE
                    36             36

     4MB        (1) 512K x     (1) 512K x        NONE           NONE
                    36             36

     4MB       (1) 1M x 36        NONE           NONE           NONE

     5MB        (1) 512K x     (1) 512K x     (1) 256K x        NONE
                    36             36             36

     6MB        (1) 512K x     (1) 512K x     (1) 512K x        NONE
                    36             36             36

     6MB        (1) 512K x    (1) 1M x 36        NONE           NONE
                    36

     7MB        (1) 512K x     (1) 512K x     (1) 512K x    (1) 256K x 36
                    36             36             36

     8MB        (1) 512K x     (1) 512K x     (1) 512K x    (1) 512K x 36
                    36             36             36

     8MB       (1) 1M x 36    (1) 1M x 36        NONE           NONE

     8MB       (1) 2M x 36        NONE           NONE           NONE

     8MB        (1) 512K x     (1) 512K x    (1) 1M x 36        NONE
                    36             36

     10MB       (1) 512K x    (1) 2M x 36        NONE           NONE
                    36

     10MB       (1) 512K x    (1) 1M x 36    (1) 1M x 36        NONE
                    36

     12MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        NONE

     12MB      (1) 1M x 36    (1) 2M x 36        NONE           NONE

     12MB       (1) 512K x     (1) 512K x    (1) 2M x 36        NONE
                    36             36

     12MB       (1) 512K x     (1) 512K x    (1) 2M x 36        NONE
                    36             36

     14MB       (1) 512K x    (1) 1M x 36    (1) 2M x 36        NONE
                    36

     16MB      (1) 2M x 36    (1) 2M x 36        NONE           NONE

     16MB      (1) 1M x 36    (1) 1M x 36    (1) 2M x 36        NONE

     16MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     16MB      (1) 4M x 36        NONE           NONE           NONE

     18MB       (1) 512K x    (1) 2M x 36    (1) 2M x 36        NONE
                    36

     20MB      (1) 1M x 36    (1) 4M x 36        NONE        (1) 2M x 36

     20MB      (1) 1M x 36    (1) 2M x 36    (1) 2M x 36        NONE

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1        Bank 2         Bank 3

     20MB       (1) 1M x 36     (1) 1M x 36   (1) 2M x 36    (1) 1M x 36

     24MB       (1) 1M x 36     (1) 1M x 36   (1) 4M x 36       NONE

     26MB        (1) 512K x     (1) 2M x 36   (1) 2M x 36       NONE
                     36

     28MB       (1) 1M x 36     (1) 2M x 36   (1) 2M x 36    (1) 2M x 36

     32MB       (1) 2M x 36     (1) 2M x 36   (1) 2M x 36    (1) 2M x 36

     32MB       (1) 2M x 36     (1) 2M x 36   (1) 4M x 36       NONE

     32MB       (1) 4M x 36     (1) 4M x 36      NONE           NONE

     40MB       (1) 1M x 36     (1) 1M x 36   (1) 4M x 36    (1) 4M x 36

     48MB       (1) 2M x 36     (1) 2M x 36   (1) 4M x 36    (1) 4M x 36

     48MB       (1) 4M x 36     (1) 4M x 36   (1) 4M x 36       NONE

     64MB       (1) 4M x 36     (1) 4M x 36   (1) 4M x 36    (1) 4M x 36

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 32K x 8

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

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

                        CACHE JUMPER CONFIGURATION

         Size                     JP3                       JP4

         64KB               pins 3 & 5, 4 & 6              Open
                                 closed

         128KB              pins 3 & 5, 4 & 6        pins 1 & 3, 2 & 4
                                 closed                   closed

         256KB              pins 1 & 3, 2 & 4      pins 1 & 2, 3 & 4, 5 &
                                 closed                  6 closed

                          CPU TYPE CONFIGURATION

                 Type                                 JP10

               80486SX                   pins 1 & 3, 2 & 4, 8 & 9 closed

               80487SX                          pins 3 & 5 closed

               80486DX                   pins 1 & 3, 4 & 6, 8 & 9 closed

               80486DX2                  pins 1 & 3, 4 & 6, 8 & 9 closed

          Pentium Overdrive              pins 1 & 3, 2 & 4, 7 & 8, 9 & 10
                                                     closed

                CPU SPEED CONFIGURATION

           Speed                        JP7

           25MHz             pins 1 & 2, 3 & 4 closed

           33MHz                 pins 3 & 4 closed

           40MHz                 pins 1 & 2 closed

           50iMHz            pins 1 & 2, 3 & 4 closed

           50MHz                       Open

           66iMHz                pins 3 & 4 closed

      VESA WAIT STATE CONFIGURATION

     Wait states             JP6

    0 wait states     pins 4 & 6 closed

    1 wait state      pins 2 & 4 closed

         BUS SPEED CONFIGURATION

      CPU speed              JP6

      <= 33MHz        pins 3 & 5 closed

       > 33MHz        pins 1 & 3 closed

          VRAM CONFIGURATION

    Size        Bank 0      Bank 1

    512KB      (8) 44256     NONE

     1MB       (8) 44256   (8) 44256

         VESA VIDEO CONFIGURATION

       Setting               JP17

       Enabled        pins 1 & 2 closed

      Disabled        pins 2 & 3 closed

              VIDEO CONFIGURATION (86C08051 ONLY)

            Setting                          JP17

              1NS                pins 10 & 11, 13 & 14 closed

              2NS                pins 11 & 12, 13 & 14 closed

              3NS                pins 10 & 11, 14 & 15 closed

              4NS                pins 11 & 12, 14 & 15 closed

             VIDEO FREQUENCY CONFIGURATION

            Size                       JP17

            43Hz             pins 5 & 6, 8 & 9 closed

            56Hz             pins 4 & 5, 8 & 9 closed

            60Hz             pins 5 & 6, 8 & 9 closed

            70Hz             pins 4 & 5, 7 & 8 closed

            72Hz             pins 4 & 5, 7 & 8 closed

                   LRDY DELAY CONFIGURATION

        Type                 JP1                  JP2

        None           pins 5 & 6 closed          Open

       2 gate          pins 3 & 4 closed          Open

        1 CLK          pins 1 & 2 closed   pins 2 & 3 closed

        2 CLK          pins 1 & 2 closed   pins 1 & 2 closed

                IDE SPEED CONFIGURATION

           Speed                       JP11

             0               pins 3 & 5, 4 & 6 closed

             1               pins 1 & 3, 4 & 6 closed

             2               pins 3 & 5, 2 & 4 closed

             3               pins 1 & 3, 2 & 4 closed

