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# FORTRESS SYSTEMS INTERNATIONAL
SPECTRUM II 486 PCI/ISA/VESA
Processor CX486SX/AM486SX/80486SX/CX486DX/AM486DX/80486DX/
CX486DX2/AM486DX2/80486DX2/CX486DX4/AM486DX4/80486DX4
Processor 25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set Unidentified
Video Chip None
Set
Maximum 64MB
Onboard
Memory
Maximum None
Video
Memory
Cache 128/256/512KB
BIOS AMI/Award/MR BIOS
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (2), 32-bit PCI slots (4)
Options
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+----------------------+-----------|
| Turbo switch | J1 | Power LED & keylock | J5 |
|--------------+----------+----------------------+-----------|
| Turbo LED | J2 | 32-bit PCI slots | PC1 – PC4 |
|--------------+----------+----------------------+-----------|
| Speaker | J3 | 32-bit VESA local | SL1 & SL2 |
| | | bus slots | |
|--------------+----------+----------------------+-----------|
| Reset switch | J4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| » | CMOS memory normal operation | JP2 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | CMOS memory clear | JP2 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | JP10A | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | JP10B | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | JP10C | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | JP10D | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | JP10E | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | JP38A | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | JP38B | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | JP38C | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | IDE type select PCI IDE | JP38D | Closed |
|---+-----------------------------------+-------+------------|
| | IDE type select VESA IDE | JP38D | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | None | None | None |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | None | None |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 512K x | None | None | None |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 3MB | (1) 256K x | (1) 512K x | None | None |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 3MB | (1) 256K x | (1) 256K x | (1) 256K x | None |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 512K x | (1) 512K x | None | None |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 5MB | (1) 256K x | (1) 1M x 36 | None | None |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 5MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 512K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 512K x | (1) 1M x 36 | None | None |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 | None | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 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 |
|------------------------------------------------------------|
| Note: Board accepts x 32 SIMMs. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP23 |
|----------------------------+-------------------------------|
| 1 BK installed | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 2 BK installed | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | (1) 8K x 8 |
|------------------+--------------------+--------------------|
| 256KB | (2) 64K x 32 | (1) 32K x 8 |
|------------------+--------------------+--------------------|
| 512KB | (4) 128K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP20 |
|----------------------------+-------------------------------|
| 128KB | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 256KB | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 512KB | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP7 | JP27 | JP28 |
|----------+---------+-------------------+-------------------|
| 25MHz | Closed | Pins 1 & 2 closed | Pins 2 & 3 closed |
|----------+---------+-------------------+-------------------|
| 33MHz | Open | Pins 2 & 3 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 50iMHz | Closed | Pins 1 & 2 closed | Pins 2 & 3 closed |
|----------+---------+-------------------+-------------------|
| 66iMHz | Open | Pins 2 & 3 closed | Pins 1 & 2 closed |
|----------+---------+-------------------+-------------------|
| 75iMHz | Closed | Pins 1 & 2 closed | Pins 2 & 3 closed |
|----------+---------+-------------------+-------------------|
| 100iMHz | Open | Pins 2 & 3 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP11 |
|----------------------------+-------------------------------|
| Cyrix | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| AMD | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Intel | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP99 |
|-------------------------------+----------------------------|
| All CPU types | Closed |
|-------------------------------+----------------------------|
| DX4 only | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLASH BIOS VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP12 | JP80 |
|------------+--------------------+--------------------------|
| 5v | Pins 1 & 2 closed | Pins 1 & 3, 2 & 4 closed |
|------------+--------------------+--------------------------|
| 12v | Pins 2 & 3 closed | Pins 3 & 5, 4 & 6 closed |
+------------------------------------------------------------+