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# MICRO EXPRESS, INC.
FOREX 486 CACHE
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 20/25/33/50 (internal)/50/66 (internal)MHz
Chip Set FOREX
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
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | JP2 | Turbo switch | JP15 |
|------------------+----------+-------------------+----------|
| Reset switch | JP3 | Turbo LED | JP16 |
|------------------+----------+-------------------+----------|
| Power LED & | JP9 | 32-bit VESA local | S1 |
| keylock | | bus slot | |
|------------------+----------+-------------------+----------|
| Speaker | JP10 | 32-bit VESA local | S2 |
| | | bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|---------------------------------+---------------+----------|
| » | Factory configured - do not | JP5 | N/A |
| | alter | | |
|---+-----------------------------+---------------+----------|
| » | CMOS memory normal | JP6 | Open |
| | operation | | |
|---+-----------------------------+---------------+----------|
| | CMOS memory clear | JP6 | 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 |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 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 4 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 4 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8A | JP8B | JP8D | JP8E |
|-------+-------------+------------+------------+------------|
| 64KB | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 128KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE/BUS SPEED (ID2 & ID3) CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | Wait states | JP102 (ID2) | JP103 (ID3) |
|------------+----------------+----------------+-------------|
| £ 33MHz | 0 wait states | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|------------+----------------+----------------+-------------|
| > 33MHz | 1 wait state | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP7A | JP7B | JP7C |
|---------+----------------+----------------+----------------|
| 20MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|---------+----------------+----------------+----------------|
| 25MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|---------+----------------+----------------+----------------|
| 33MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|---------+----------------+----------------+----------------|
| 50i MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|---------+----------------+----------------+----------------|
| 50MHz | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|---------+----------------+----------------+----------------|
| 66i MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP12 | JP13 | JP29 | JP30 |
|---------------+-----------+----------+----------+----------|
| 80486SX/PQFP | pins 2 & | pins 2 & | pins 2 & | pins 2 & |
| | 3 closed | 3 closed | 3 closed | 3 closed |
|---------------+-----------+----------+----------+----------|
| 80486SX/PGA | pins 2 & | pins 2 & | pins 2 & | pins 2 & |
| | 3 closed | 3 closed | 3 closed | 3 closed |
|---------------+-----------+----------+----------+----------|
| 80487SX/PGA | pins 1 & | pins 1 & | pins 2 & | pins 2 & |
| | 2 closed | 2 closed | 3 closed | 3 closed |
|---------------+-----------+----------+----------+----------|
| 80486DX/PQFP | pins 2 & | pins 2 & | pins 2 & | pins 2 & |
| | 3 closed | 3 closed | 3 closed | 3 closed |
|---------------+-----------+----------+----------+----------|
| 80486DX/PGA | pins 1 & | pins 1 & | pins 1 & | pins 1 & |
| | 2 closed | 2 closed | 2 closed | 2 closed |
|---------------+-----------+----------+----------+----------|
| 80486DX2/PQFP | pins 2 & | pins 2 & | pins 2 & | pins 2 & |
| | 3 closed | 3 closed | 3 closed | 3 closed |
|---------------+-----------+----------+----------+----------|
| 80486DX2/PGA | pins 1 & | pins 1 & | pins 1 & | pins 1 & |
| | 2 closed | 2 closed | 2 closed | 2 closed |
+------------------------------------------------------------+