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# EVEREX SYSTEMS, INC.
STEP PLUS 486 (EV-18216)
Processor 80486SX/80487SX/80486DX/80486DX2/Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
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
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| LAN port | CN1 | Power LED | J4 |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN2 | IDE interface | J5 |
| | | LED | |
|-------------------+----------+------------------+----------|
| 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 | CN7 | CD-ROM auxiliary | J14 |
| interface | | in | |
|-------------------+----------+------------------+----------|
| 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 | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 512K x | (1) 2M x 36 | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 512K x | (1) 1M x 36 | (1) 1M x | NONE |
| | 36 | | 36 | |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 2M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 512K x | (1) 512K x | (1) 2M x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 512K x | (1) 512K x | (1) 2M x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 14MB | (1) 512K x | (1) 1M x 36 | (1) 2M x | NONE |
| | 36 | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 2M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 512K x | (1) 2M x 36 | (1) 2M x | NONE |
| | 36 | | 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 | NONE |
| | | | 36 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 1M x 36 | (1) 1M x 36 | (1) 2M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 26MB | (1) 512K x | (1) 2M x 36 | (1) 2M x | NONE |
| | 36 | | 36 | |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 1M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 2M x 36 | (1) 2M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 2M x 36 | (1) 2M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 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 & 6 |
| | closed | 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 |
+------------------------------------------------------------+