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# YOUNG MICRO SYSTEMS, INC.
486 EISA/VESA
Processor 80486SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed 20/25/33/40/50/50(internal)/66(internal)/MHz
Chip Set VIA
Max. Onboard DRAM 64MB
Cache 64/128/256/512/1024KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Reset switch | CN1 | Turbo LED | CN4 |
|---------------+----------+----------------------+----------|
| Power LED & | CN2 | Turbo switch | CN5 |
| keylock | | | |
|---------------+----------+----------------------+----------|
| Speaker | CN3 | 32 bit VESA local | SL1, |
| | | bus slots | SL2, SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | J1 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Fastgate A20 enabled | J2 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Fastgate A20 disabled | J2 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | One or more ISA busmastering | J10 | pins 1 & 2 |
| | devices on ISA bus | | closed |
|---+----------------------------------+--------+------------|
| | ISA busmastering system free | J10 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Normal BIOS type operation | JP20 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Flash EPROM type BIOS enabled | JP20 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Graphic accelerator cards | JP21 | pins 1 & 2 |
| | without Weitek P9x00 | | closed |
|---+----------------------------------+--------+------------|
| | Graphic accelerator card with | JP21 | pins 2 & 3 |
| | Weitek P9x00 | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+---------------+-------------+------------+----------|
| 1MB | (1) 256K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 512K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 256K x 36 | (1) 256K x | NONE | NONE |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 512K x 36 | NONE | (1) 512K x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 16MB | (1) 2M x 36 | NONE | (1) 2M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 32MB | (1) 8M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 32MB | (1) 4M x 36 | NONE | (1) 4M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 64MB | (1) 8M x 36 | NONE | (1) 8M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION (WRITE-THROUGH CACHE) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | WTTAG | WBTAG |
|-------+--------------+--------------+-------+--------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | NONE | (1) 8K x 8 |
|-------+--------------+--------------+-------+--------------|
| 128KB | (4) 32K x 8 | NONE | NONE | (1) 32K x 8 |
|-------+--------------+--------------+-------+--------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | NONE | (1) 32K x 8 |
|-------+--------------+--------------+-------+--------------|
| 512KB | (4) 128K x 8 | NONE | NONE | (1) 32K x 8 |
|-------+--------------+--------------+-------+--------------|
| 1M | (4) 128K x 8 | (4) 128K x 8 | NONE | (1) 128K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION (WRITE-BACK CACHE) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | WTTAG | WBTAG |
|-------+-------------+------------+------------+------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | (1) 8K x 8 |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | NONE | (1) 32K x | (1) 32K x |
| | | | 8 | 8 |
|-------+-------------+------------+------------+------------|
| 256KB | (4) 32K x 8 | (4) 32K x | (1) 32K x | (1) 32K x |
| | | 8 | 8 | 8 |
|-------+-------------+------------+------------+------------|
| 512KB | (4) 128K x | NONE | (1) 32K x | (1) 32K x |
| | 8 | | 8 | 8 |
|-------+-------------+------------+------------+------------|
| 1M | (4) 128K x | (4) 128K x | (1) 128K x | (1) 128K x |
| | 8 | 8 | 8 | 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JS1 | JS2 | JS3 | JS4 | JS5 | JS6 |
|--------+--------+--------+--------+--------+-------+-------|
| 64KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|--------+--------+--------+--------+--------+-------+-------|
| 128KB | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|--------+--------+--------+--------+--------+-------+-------|
| 256KB | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
|--------+--------+--------+--------+--------+-------+-------|
| 512KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 |
|--------+--------+--------+--------+--------+-------+-------|
| 1MB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | Speed | JC1 | JC2 | JC3 | JK1 | JK2 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486SX | 20MHz | 2 & 3 | 2 & 3 | Open | 1 & 2 | 1 & 2 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486SX | 25MHz | 2 & 3 | 2 & 3 | Open | 1 & 2 | 1 & 2 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486SX | 33MHz | 2 & 3 | 2 & 3 | Open | 1 & 2 | 1 & 2 |
|----------+--------+--------+-------+-------+-------+-------|
| 80487SX | 25MHz | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486DX | 25MHz | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486DX | 33MHz | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486DX | 40MHz | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486DX | 50MHz | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486DX2 | 50iMHz | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486DX2 | 66iMHz | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| CPU Type | Speed | JV1 | JV2 | JK3A1 | JK3B1 |
|-----------+----------+---------+--------+---------+--------|
| 80486SX | 20MHz | 2 & 3 | 1 & 2 | Closed | Closed |
|-----------+----------+---------+--------+---------+--------|
| 80486SX | 25MHz | 2 & 3 | 1 & 2 | Open | Closed |
|-----------+----------+---------+--------+---------+--------|
| 80486SX | 33MHz | 2 & 3 | 1 & 2 | Closed | Open |
|-----------+----------+---------+--------+---------+--------|
| 80487SX | 25MHz | 2 & 3 | 1 & 2 | Open | Closed |
|-----------+----------+---------+--------+---------+--------|
| 80486DX | 25MHz | 2 & 3 | 1 & 2 | Open | Closed |
|-----------+----------+---------+--------+---------+--------|
| 80486DX | 33MHz | 2 & 3 | 2 & 3 | Closed | Open |
|-----------+----------+---------+--------+---------+--------|
| 80486DX | 40MHz | 2 & 3 | 2 & 3 | Open | Open |
|-----------+----------+---------+--------+---------+--------|
| 80486DX | 50MHz | 2 & 3 | 1 & 2 | Open | Closed |
|-----------+----------+---------+--------+---------+--------|
| 80486DX2 | 50iMHz | 2 & 3 | 1 & 2 | Open | Open |
|-----------+----------+---------+--------+---------+--------|
| 80486DX2 | 66iMHz | 2 & 3 | 1 & 2 | Closed | Closed |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+