EVEREX SYSTEMS, INC.

STEP 386/20/25/33 GATE ARRAY (EV-18108)

Processor         80386DX
Processor Speed   20/25/33MHz
Chip Set          C & T
Max. onboard DRAM 32MB
SRAM Cache        128/256KB
BIOS              AMI/MR
Dimensions        355mm x 304mm
I/O Options       32-bit external memory card, floppy drive interface,

                  IDE interface, parallel port, serial ports (2)
NPU Options       80387DX

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Parallel port              CN1       LED connector               J1

  Serial port 1              CN2       Speaker                     J2

  Serial port 2              CN3       IDE interface LED           J5

  IDE interface              CN4       32-bit external             S1
                                       memory card

  Floppy drive               CN5       Instep socket              U19
  interface

                      CACHE CONFIGURATION

      Size       Max Cachable       Bank 0          Bank 1

     128KB           16MB         (4) 32K x 8        NONE

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

  CACHE JUMPER CONFIGURATION

     Size             P1

     128KB           Open

     256KB          Closed

[Image]

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (4) 256K x 9      NONE           NONE           NONE

     2MB        (4) 256K x 9   (4) 256K x 9      NONE           NONE

     3MB        (4) 256K x 9   (4) 256K x 9   (4) 256K x 9      NONE

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

     4MB        (4) 1M x 9        NONE           NONE           NONE

     5MB        (4) 1M x 9     (4) 256K x 9      NONE           NONE

     6MB        (4) 1M x 9     (4) 256K x 9   (4) 256K x 9      NONE

     7MB        (4) 1M x 9     (4) 256K x 9   (4) 256K x 9  (4) 256K x 9

     8MB        (4) 1M x 9     (4) 1M x 9        NONE           NONE

     9MB        (4) 1M x 9     (4) 1M x 9     (4) 256K x 9      NONE

     10MB       (4) 1M x 9     (4) 1M x 9     (4) 256K x 9  (4) 256K x 9

     12MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9        NONE

     13MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9    (4) 256K x 9

     16MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     16MB       (4) 4M x 9        NONE           NONE           NONE

     17MB       (4) 4M x 9     (4) 256K x 9      NONE           NONE

     18MB       (4) 4M x 9     (4) 256K x 9   (4) 256K x 9      NONE

     20MB       (4) 4M x 9     (4) 1M x 9        NONE           NONE

     21MB       (4) 4M x 9     (4) 1M x 9     (4) 256K x 9      NONE

     22MB       (4) 4M x 9     (4) 1M x 9     (4) 256K x 9  (4) 256K x 9

     24MB       (4) 4M x 9     (4) 1M x 9     (4) 1M x 9        NONE

     25MB       (4) 4M x 9     (4) 1M x 9     (4) 1M x 9    (4) 256K x 9

     28MB       (4) 4M x 9     (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     32MB       (4) 4M x 9     (4) 4M x 9        NONE           NONE

     33MB       (4) 4M x 9     (4) 4M x 9     (4) 256K x 9      NONE

     34MB       (4) 4M x 9     (4) 4M x 9     (4) 256K x 9  (4) 256K x 9

     36MB       (4) 4M x 9     (4) 4M x 9     (4) 1M x 9        NONE

     37MB       (4) 4M x 9     (4) 4M x 9     (4) 1M x 9    (4) 256K x 9

     40MB       (4) 4M x 9     (4) 1M x 9     (4) 1M x 9     (4) 4M x 9

     48MB       (4) 4M x 9     (4) 4M x 9     (4) 4M x 9        NONE

     49MB       (4) 4M x 9     (4) 4M x 9     (4) 4M x 9    (4) 256K x 9

     52MB       (4) 4M x 9     (4) 4M x 9     (4) 4M x 9     (4) 1M x 9

     64MB       (4) 4M x 9     (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

                        SERIAL PORT 1 CONFIGURATION

  Port 1 (CN2)     J15/1 & 2      J15/3 & 4     J15/5 & 6      J15/7 & 8

  »      IRQ4         Open          Open          Closed         Open

         IRQ3         Open         Closed          Open          Open

         IRQ5         Open          Open           Open         Closed

         IRQ9        Closed         Open           Open          Open

                         SERIAL PORT CONFIGURATION

  Port 1 (CN3)     J15/9 & 10    J15/11 & 12    J15/13 & 14   J15/15 & 16

  »      IRQ3         Open         Closed          Open          Open

         IRQ4         Open          Open          Closed         Open

         IRQ5         Open          Open           Open         Closed

         IRQ9        Closed         Open           Open          Open

                        PARALLEL PORT CONFIGURATION

       LPT 2         J12/pins 1 & 2     J12/pins 3 & 4    J12/pins 5 & 6

  »       IRQ7            Open               Open             Closed

          IRQ5            Open              Closed             Open

          IRQ9           Closed              Open              Open