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# YOUNG MICRO SYSTEMS, INC.
VEGA 486 PCI/VESA
Processor 80486SX/80486DX/80486DX2/Pentium Overdrive
Processor 20/25/33/50(internal)/66(internal)MHz
Speed
Chip Set Intel
Max. Onboard 128MB
DRAM
Cache 64/128/256/512KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (3), PCI bus slots
(4)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| PS/2 mouse port | J1 | Reset switch | J5 |
|-----------------+----------+--------------------+----------|
| Power LED & | J2 | 32-bit VESA Local | SL1, |
| keylock | | bus slots | SL2, SL3 |
|-----------------+----------+--------------------+----------|
| Speaker | J3 | 32-bit PCI slots | P1, P2, |
| | | | P3, P4 |
|-----------------+----------+--------------------+----------|
| Turbo switch | J4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | J6 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP15 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Parity check enabled | JP16 | Open |
|---+----------------------------------+--------+------------|
| | Parity check disabled | JP16 | Closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP21 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP21 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP41 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP43 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP44 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP81 | Open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CMOS CONFIGURATION |
|------------------------------------------------------------|
| Type | JP22 | JP23 | JP26 |
|--------------------+-------------+------------+------------|
| CMOS memory normal | Closed | Open | Open |
|--------------------+-------------+------------+------------|
| CMOS memory clear | Open | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 36 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | NONE |
|------------------+--------------------+--------------------|
| 66MB | (2) 8M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (2) 16K x 4 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (2) 16K x 4 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (2) 16K x 4 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (2) 32K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP6 | JP7 | JP8 | JP9 |
|---------+------------+------------+------------+-----------|
| 64KB | Open | Open | Open | Open |
|---------+------------+------------+------------+-----------|
| 128KB | Closed | Open | Open | Closed |
|---------+------------+------------+------------+-----------|
| 256KB | Closed | Closed | Open | Closed |
|---------+------------+------------+------------+-----------|
| 512KB | Closed | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Size | JP10 | JP11 | JP17 | JP18 |
|-------+--------+--------+-----------------+----------------|
| 64KB | Open | Open | pins 2 & 3 | pins 2 & 3 |
| | | | closed | closed |
|-------+--------+--------+-----------------+----------------|
| 128KB | Open | Open | pins 2 & 3 | pins 1 & 2 |
| | | | closed | closed |
|-------+--------+--------+-----------------+----------------|
| 256KB | Closed | Open | pins 1 & 2 | pins 2 & 3 |
| | | | closed | closed |
|-------+--------+--------+-----------------+----------------|
| 512KB | Closed | Closed | pins 1 & 2 | pins 1 & 2 |
| | | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| L2 CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | JI1 | JI2 | JI3 |
|-------------+---------------+---------------+--------------|
| Standard | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------------+---------------+---------------+--------------|
| Interleaved | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONTROL CONFIGURATION |
|------------------------------------------------------------|
| Wait states | Tag bit | JP14 | JP20 |
| | size | | |
|---------------+-------------+---------------+--------------|
| O wait states | 7 bit | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|---------------+-------------+---------------+--------------|
| 1 wait state | 8 bit | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE MODE CONFIGURATION (L2) |
|------------------------------------------------------------|
| Type | JP4 | JP19 |
|--------------------------+------------+--------------------|
| L2 cache (write-through) | Open | pins 1 & 2 closed |
|--------------------------+------------+--------------------|
| L2 cache (write-back) | Closed | pins 1 & 2 closed |
|--------------------------+------------+--------------------|
| L2 cache (disabled) | N/A | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE MODE CONFIGURATION (PENTIUM OVERDRIVE) |
|------------------------------------------------------------|
| Type | JP2 | JP60 |
|---------------------------+-----------+--------------------|
| Overdrive (write-through) | Open | pins 1 & 2 closed |
|---------------------------+-----------+--------------------|
| Overdrive (write-back) | Closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP3 | JP12 | JP13 | JP27 | JP28 |
|-------------+-------+-----+-------+------+--------+--------|
| 80486SX-20 | 2 & 3 | 1 & | 2 & 3 | 2 & | Closed | Closed |
| | | 2 | | 3 | | |
|-------------+-------+-----+-------+------+--------+--------|
| 80486SX-25 | 2 & 3 | 1 & | 2 & 3 | 2 & | Open | Closed |
| | | 2 | | 3 | | |
|-------------+-------+-----+-------+------+--------+--------|
| 80486SX-33 | 2 & 3 | 1 & | 1 & 2 | 2 & | Closed | Open |
| | | 2 | | 3 | | |
|-------------+-------+-----+-------+------+--------+--------|
| 80486DX-20 | 1 & | 1 & | 2 & 3 | 2 & | Closed | Closed |
| | 2, 3 | 2 | | 3 | | |
| | & 4 | | | | | |
|-------------+-------+-----+-------+------+--------+--------|
| 80486DX-25 | 1 & | 1 & | 2 & 3 | 2 & | Open | Closed |
| | 2, 3 | 2 | | 3 | | |
| | & 4 | | | | | |
|-------------+-------+-----+-------+------+--------+--------|
| 80486DX-33 | 1 & | 1 & | 1 & 2 | 2 & | Closed | Open |
| | 2, 3 | 2 | | 3 | | |
| | & 4 | | | | | |
|-------------+-------+-----+-------+------+--------+--------|
| 80486DX2-50 | 1 & | 1 & | 2 & 3 | 2 & | Open | Closed |
| | 2, 3 | 2 | | 3 | | |
| | & 4 | | | | | |
|-------------+-------+-----+-------+------+--------+--------|
| 80486DX2-66 | 1 & | 1 & | 1 & 2 | 2 & | Closed | Open |
| | 2, 3 | 2 | | 3 | | |
| | & 4 | | | | | |
|-------------+-------+-----+-------+------+--------+--------|
| Overdrive | 1 & | 2 & | 1 & 2 | 2 & | Closed | Open |
| | 2, 3 | 3 | | 3 | | |
| | & 4 | | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP5/A | JP5/B | JP5/C | JP5/D |
|--------------+----------+----------+-----------+-----------|
| 5.0V CPU | Open | Open | Closed | Closed |
|--------------+----------+----------+-----------+-----------|
| 80486DX4 CPU | Open | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE/BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | Wait states | JP36 | JP37 |
|---------------+---------------+--------------+-------------|
| < 33MHz | 0 wait states | Open | Open |
|---------------+---------------+--------------+-------------|
| > 33MHz | 1 wait state | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI ADDRESS CONFIGURATION |
|------------------------------------------------------------|
| Address (Slot | Address (Slot | JP70 | JP71 |
| 1) | 2) | | |
|---------------+---------------+---------------+------------|
| Address 17 | Address 17 | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|---------------+---------------+---------------+------------|
| Address 28 | Address 29 | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI IRQ CONFIGURATION |
|------------------------------------------------------------|
| IRQ Type | JP33 | JP34 | JP35 | JP38 |
| | (IRQ9) | (IRQ10) | (IRQ11) | (IRQ14) |
|----------+------------+------------+------------+----------|
| Standard | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & |
| | closed | closed | closed | 2 closed |
|----------+------------+------------+------------+----------|
| Inverted | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & |
| | closed | closed | closed | 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI LEVEL TRIGGER IRQ CONFIGURATION |
|------------------------------------------------------------|
| IRQ Type | JP39 |
|----------------------------+-------------------------------|
| IRQ9 | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| IRQ10 | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| IRQ11 | pins 5 & 6 closed |
|----------------------------+-------------------------------|
| IRQ14 | pins 7 & 8 closed |
|----------------------------+-------------------------------|
| IRQ15 | pins 9 & 10 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SYSTEM BIOS CONFIGURATION |
|------------------------------------------------------------|
| Type | JP24 | JP25 |
|--------------------+------------------+--------------------|
| Normal | Open | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| Flash | Closed | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| Recover | Open | pins 2 & 3 closed |
+------------------------------------------------------------+