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# UNIDENTIFIED
486 VESA (REV. VL 421A/422)
Processor CX486S/80486SX/80487SX/80486DX/80486DX2/P24T
Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set Forex
Video Chip Set None
Maximum Onboard 36MB
Memory
Maximum Video None
Memory
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 | SL1 & |
| keylock | | local bus slots | SL2 |
|-------------------+----------+------------------+----------|
| Speaker | JP10 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| | Battery type select internal | JP2 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Battery type select external | JP2 | Closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP5 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | JP6 | Unidentified |
| | alter (CMOS) | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | None | (4) 256K x 9 | None |
|------------+---------------+---------------+---------------|
| 2MB | None | (4) 256K x 9 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 4MB | (8) 411000 | None | None |
|------------+---------------+---------------+---------------|
| 4MB | None | (4) 1M x 9 | None |
|------------+---------------+---------------+---------------|
| 5MB | (8) 411000 | (4) 256K x 9 | None |
|------------+---------------+---------------+---------------|
| 5MB | None | (4) 1M x 9 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 8MB | (8) 411000 | (4) 1M x 9 | None |
|------------+---------------+---------------+---------------|
| 8MB | None | (4) 1M x 9 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 12MB | (8) 411000 | (4) 1M x 9 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 16MB | None | (4) 4M x 9 | None |
|------------+---------------+---------------+---------------|
| 20MB | (8) 411000 | (4) 4M x 9 | None |
|------------+---------------+---------------+---------------|
| 32MB | None | (4) 4M x 9 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 36MB | (8) 411000 | (4) 4M x 9 | (4) 4M x 9 |
|------------------------------------------------------------|
| Note: The location of banks 1 & 2 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER SELECTION |
|------------------------------------------------------------|
| Setting | JP105 |
|-------------------------------+----------------------------|
| DIPPs used as bank 0 | Pins 1 & 2 closed |
|-------------------------------+----------------------------|
| SIMMs used as bank 0 | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | None | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8A | JP8B | JP8D | JP8E |
|-------+-------------+------------+------------+------------|
| 64KB | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 128KB | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| 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 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 40MHz | Pins 2 & 3 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 50iMHz | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 50MHz | Pins 2 & 3 | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed |
|--------+-----------------+----------------+----------------|
| 66iMHz | Pins 1 & 2 | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP12 | JP13 | JP29 |
|--------------+-------------------+------------+------------|
| CX486S | N/A | N/A | N/A |
|--------------+-------------------+------------+------------|
| 80486 (PQFP) | Pins 2 & 3 closed | Pins 2 & 3 | Pins 2 & 3 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| 80486SX | Pins 2 & 3 closed | Pins 2 & 3 | Pins 2 & 3 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| 80487SX | Pins 1 & 2 closed | Pins 1 & 2 | Pins 2 & 3 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| 80486DX | Pins 1 & 2 closed | Pins 1 & 2 | Pins 1 & 2 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| 80486DX2 | Pins 1 & 2 closed | Pins 1 & 2 | Pins 1 & 2 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| P24T | N/A | N/A | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CON’T) |
|------------------------------------------------------------|
| Type | JP30 | JP104 | JP109 | JP110 |
|-----------+------------+-----------+-----------+-----------|
| CX486S | N/A | N/A | N/A | Pins 1 & |
| | | | | 2 closed |
|-----------+------------+-----------+-----------+-----------|
| 80486 | Pins 2 & 3 | N/A | N/A | N/A |
| (PQFP) | closed | | | |
|-----------+------------+-----------+-----------+-----------|
| 80486SX | Pins 2 & 3 | N/A | N/A | N/A |
| | closed | | | |
|-----------+------------+-----------+-----------+-----------|
| 80487SX | Pins 2 & 3 | N/A | N/A | N/A |
| | closed | | | |
|-----------+------------+-----------+-----------+-----------|
| 80486DX | Pins 1 & 2 | Pins 1 & | Pins 1 & | Pins 2 & |
| | closed | 2 closed | 2 closed | 3 closed |
|-----------+------------+-----------+-----------+-----------|
| 80486DX2 | Pins 1 & 2 | Pins 1 & | Pins 1 & | Pins 2 & |
| | closed | 2 closed | 2 closed | 3 closed |
|-----------+------------+-----------+-----------+-----------|
| P24T | N/A | Pins 2 & | Pins 2 & | N/A |
| | | 3 closed | 3 closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS WAIT STATE SELECTION |
|------------------------------------------------------------|
| Setting | JP102 | JP103 |
|------------------+--------------------+--------------------|
| 0 | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 1 | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+