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# YOUNG MICRO SYSTEMS, INC.
VEGA 486G-VIP (REV. 1.0)
Processor 80486SX/80486DX/80486DX2/80486DX4/P24D/Pentium Overdrive
Processor 25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set Intel
Max. 128MB
Onboard
DRAM
Cache 128/256/512KB
BIOS AMI
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slot, 32-bit PCI slots (3), IDE interface,
Options PS/2 mouse connector
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Speaker | CN1 | IDE interface LED | CN6 |
|---------------+----------+----------------------+----------|
| Reset switch | CN2 | IDE interface | CN7 |
|---------------+----------+----------------------+----------|
| Turbo LED | CN3 | 32-bit PCI slots | PC1 - |
| | | | PC3 |
|---------------+----------+----------------------+----------|
| Turbo switch | CN4 | 32-bit VESA local | SL1 |
| | | bus slots | |
|---------------+----------+----------------------+----------|
| PS/2 mouse | CN5 | | |
| connector | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | IDE interface enabled | JP4 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | IDE interface disabled | JP4 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP9 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Flash BIOS write protect | JP10 | pins 2 & 3 |
| | disabled | | closed |
|---+----------------------------------+--------+------------|
| | Flash BIOS write protect enabled | JP10 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Mouse IRQ12 enabled | JP15 | Closed |
|---+----------------------------------+--------+------------|
| | Mouse IRQ12 disabled | JP15 | Open |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP16 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP16 | Open |
|---+----------------------------------+--------+------------|
| » | SMI disabled | JP25 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | SMI enabled | JP25 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|-------+-------------+------------+------------+------------|
| 4MB | (1) 512K x | (1) 512K x | NONE | NONE |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 2M x 36 | (1) 2M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 8M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 64K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 64K x 8 | (4) 64K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JC1 | JC2 | JC3 | JC4 | JC5 |
|----------+---------+---------+---------+---------+---------|
| 128KB | 2 & 3 | 1 & 2 | Open | Open | Open |
|----------+---------+---------+---------+---------+---------|
| 256KB | 1 & 2 | 2 & 3 | Open | Closed | Open |
|----------+---------+---------+---------+---------+---------|
| 256KB | 1 & 2 | 1 & 2 | Closed | Closed | Open |
|----------+---------+---------+---------+---------+---------|
| 512KB | 1 & 2 | 1 & 2 | Open | Closed | Closed |
|----------+---------+---------+---------+---------+---------|
| 512KB | 1 & 2 | 1 & 2 | Closed | Closed | Closed |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP2 | JP3 | JP26 | JP43 | JR57 |
|-------------+------------+--------+--------+------+--------|
| 80486SX | pins 2 & 3 | Open | Open | Open | Closed |
| | closed | | | | |
|-------------+------------+--------+--------+------+--------|
| 80486DX | pins 1 & 2 | Open | Open | Open | Closed |
| | closed | | | | |
|-------------+------------+--------+--------+------+--------|
| 80486DX2 | pins 1 & 2 | Closed | Closed | Open | Closed |
| | closed | | | | |
|-------------+------------+--------+--------+------+--------|
| 80486DX4 | pins 1 & 2 | Closed | Closed | Open | Closed |
| | closed | | | | |
|-------------+------------+--------+--------+------+--------|
| P24D | pins 1 & 2 | Closed | Closed | Open | Open |
| | closed | | | | |
|-------------+------------+--------+--------+------+--------|
| Pentium | pins 1 & 2 | Closed | Closed | Open | Closed |
| Overdrive | closed | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP7 | JP8 | JP40 | JP41 |
|---------+-------------------+------------+--------+--------|
| 25MHz | pins 2 & 3 closed | pins 2 & 3 | Open | Closed |
| | | closed | | |
|---------+-------------------+------------+--------+--------|
| 33MHz | pins 1 & 2 closed | pins 2 & 3 | Closed | Open |
| | | closed | | |
|---------+-------------------+------------+--------+--------|
| 40MHz | pins 2 & 3 closed | pins 1 & 2 | Open | Open |
| | | closed | | |
|---------+-------------------+------------+--------+--------|
| 50iMHz | pins 2 & 3 closed | pins 2 & 3 | Open | Closed |
| | | closed | | |
|---------+-------------------+------------+--------+--------|
| 66iMHz | pins 1 & 2 closed | pins 2 & 3 | Closed | Open |
| | | closed | | |
|---------+-------------------+------------+--------+--------|
| 75iMHz | pins 2 & 3 closed | pins 2 & 3 | Open | Closed |
| | | closed | | |
|---------+-------------------+------------+--------+--------|
| 100iMHz | pins 1 & 2 closed | pins 2 & 3 | Closed | Open |
| | | closed | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486DX4 ONLY) |
|------------------------------------------------------------|
| Speed | JP1 |
|----------------------------+-------------------------------|
| 2x | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 2.5x | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3x | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JV0 | JV3 | JV4 |
|---------------+--------------+--------------+--------------|
| 3.3V | Open | Open | Open |
|---------------+--------------+--------------+--------------|
| 5.0V | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP36 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP37 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CMOS CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | JP12 | JP13 |
|------------------------------+--------------+--------------|
| CMOS memory normal operation | Closed | Closed |
|------------------------------+--------------+--------------|
| CMOS memory clear | Open | Open |
+------------------------------------------------------------+