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# UNIDENTIFIED
US3486-33/50C(USAi)
Processor 80386SX/80386DX/CX486DLC/80486SX/80486DX/80486DX2
Processor 20/25/33/40(internal)/50(internal)/50/66(internal)MHz
Speed
Chip Set USAi
Max. 32MB
Onboard
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 230mm x 218mm
I/O 32-bit VESA local bus slots (2)
Options
NPU 80387
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Power LED & | J2 | External battery | J7 |
| keylock | | | |
|---------------+----------+----------------------+----------|
| Turbo switch | J4 | Speaker | J100 |
|---------------+----------+----------------------+----------|
| Turbo LED | J5 | 32-bit VESA Local | SL1 & |
| | | bus slots | SL2 |
|---------------+----------+----------------------+----------|
| Reset switch | J6 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome | J3 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | J3 | Closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JMP3 | pins 2 & 3 |
| | (Internal Battery) | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory normal operation | JMP3 | pins 1 & 2 |
| | (External Battery) | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JMP3 | pins 2 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | NPU disabled | JMP4 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | NPU enabled | JMP4 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | CPU type select 80386DX not | JMP5 | Open |
| | installed | | |
|---+----------------------------------+--------+------------|
| | CPU type select 80386DX | JMP5 | Closed |
| | installed | | |
|---+----------------------------------+--------+------------|
| » | CPU type select 80486DX-50 not | JMP7 | Open |
| | installed | | |
|---+----------------------------------+--------+------------|
| | CPU type select 80486DX-50 | JMP7 | Closed |
| | installed | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 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 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 | JMP1 | JMP8 |
|-------+--------------------------------+-------------------|
| 64KB | pins 1 & 2, 4 & 5, 7 & 8 | pins 1 & 2, 4 & 5 |
| | closed | closed |
|-------+--------------------------------+-------------------|
| 128KB | pins 2 & 3, 5 & 6, 8 & 9 | pins 2 & 3, 5 & 6 |
| | closed | closed |
|-------+--------------------------------+-------------------|
| 256KB | pins 2 & 3, 5 & 6, 8 & 9 | pins 2 & 3, 5 & 6 |
| | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JMP10 | JMP12 |
|----------------+--------------------------+----------------|
| 80386 | pins 2 & 5, 3 & 6 closed | Open |
|----------------+--------------------------+----------------|
| 80486 | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JMP2 |
|----------------------------+-------------------------------|
| 80486SX | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 80486DX | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JMP9 |
|--------------------------+---------------------------------|
| 20MHz | pins 2 & 6, 3 & 7 closed |
|--------------------------+---------------------------------|
| 25MHz | pins 2 & 6, 4 & 8 closed |
|--------------------------+---------------------------------|
| 33MHz | pins 3 & 7, 4 & 8 closed |
|--------------------------+---------------------------------|
| 40MHz | pins 2 & 6 closed |
|--------------------------+---------------------------------|
| 50MHz | pins 3 & 7 closed |
|--------------------------+---------------------------------|
| 66iMHz | pins 1 & 5, 3 & 7, 4 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JMP6 |
|----------------------------+-------------------------------|
| 80486DX-33/DX2-66 | pins 1 & 4, 3 & 6 closed |
|----------------------------+-------------------------------|
| 80486DX-50 | pins 1 & 4 closed |
+------------------------------------------------------------+