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# ELITEGROUP COMPUTER SYSTEMS, INC.
486U (REV. 1.1C)
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33/40/50MHz
Chip Set UMC
Video Chip Set None
Maximum Onboard Memory 64MB (32MB on external memory card)
Maximum Video Memory None
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 220mm
I/O Options External memory card
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J1 | External battery | J7 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J2 | Turbo LED | W1 pins |
| | | | 2 & 3 |
|-------------------+----------+------------------+----------|
| Turbo switch | J4 | Reset switch | W14 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| | Turbo mode enabled | J4 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Turbo mode disabled | J4 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | J5 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | W2 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | W5 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | W11 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (4) 256K x | None | None | None |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | None | None |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 3MB | (4) 256K x | (4) 256K x | (4) 256K x | None |
| | 9 | 9 | 9 | |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 256K x | (4) 256K x | (4) 256K x | (4) 256K x |
| | 9 | 9 | 9 | 9 |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 1M x 9 | None | None | None |
|------+-------------+-------------+------------+------------|
| 5MB | (4) 256K x | (4) 1M x 9 | None | None |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 6MB | (4) 256K x | (4) 256K x | (4) 1M x 9 | None |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | None | None |
|------+-------------+-------------+------------+------------|
| 9MB | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 | None |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 10MB | (4) 256K x | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | None |
|------+-------------+-------------+------------+------------|
| 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 |
|------+-------------+-------------+------------+------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | None | None |
|------+-------------+-------------+------------+------------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | None |
|------+-------------+-------------+------------+------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | None | None |
|------+-------------+-------------+------------+------------|
| 36MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | None |
|------+-------------+-------------+------------+------------|
| 40MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------+-------------+-------------+------------+------------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | None |
|------+-------------+-------------+------------+------------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------------------------------------------------------------|
| Note: Banks 2 & 3 are located on the external memory card. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | None |
|------------------+--------------------+--------------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W6 | W8 | W9 | W12 | W13 |
|----------+----------+----------+---------+--------+--------|
| None | Open | Open | Open | Open | Open |
|----------+----------+----------+---------+--------+--------|
| 64KB | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 128KB | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 |
|----------+----------+----------+---------+--------+--------|
| 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TAG CONFIGURATION |
|------------------------------------------------------------|
| Size | U2 | U3 | U4 | U5 |
|--------+------------+------------+------------+------------|
| 64KB | (1) 16K x | (1) 16K x | (1) 16K x | (1) 16K x |
| | 4 | 4 | 4 | 4 |
|--------+------------+------------+------------+------------|
| 128KB | (1) 16K x | (1) 16K x | (1) 16K x | (1) 16K x |
| | 4 | 4 | 4 | 4 |
|--------+------------+------------+------------+------------|
| 256KB | (1) 16K x | (1) 16K x | (1) 16K x | (1) 16K x |
| | 4 | 4 | 4 | 4 |
|------------------------------------------------------------|
| Note: U4 & U5 must be installed even if no cache is |
| installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TAG JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W7 |
|-------------------------------+----------------------------|
| No cache installed | Closed |
|-------------------------------+----------------------------|
| Chip installed at U3 | Open |
|-------------------------------+----------------------------|
| Chip not installed at U3 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | J3 | W3 | W4 | W10 | W15 |
|-----------+---------+---------+----------+---------+-------|
| 80486SX | Open | 2 & 3 | Open | Open | Open |
|-----------+---------+---------+----------+---------+-------|
| 80487SX | 2 & 3 | 1 & 2 | Closed | Closed | Open |
|-----------+---------+---------+----------+---------+-------|
| 80486DX | 1 & 2 | 1 & 2 | Closed | Open | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+