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# DIGITAL EQUIPMENT CORPORATION
DECPC LP
Device Type Mainboard
Processor 80486SX/80486DX/80486DX2
Processor Speed 25/33/50(internal)/66(internal)MHz
Chip Set OPTI
Video Chip Set Unidentified
Maximum Onboard 64MB
Memory
Maximum Video 1MB
Memory
Cache 64KB
BIOS Unidentified
Dimensions 254mm x 218mm
I/O Options Floppy drive interface, IDE interface,
parallel port, PS/2 mouse port, serial ports
(2), VGA feature connector, VGA port, riser
slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| VGA port | CN1 | IDE interface | CN6 |
|-----------------+----------+--------------------+----------|
| Parallel port | CN2 | Floppy drive | CN7 |
| | | interface | |
|-----------------+----------+--------------------+----------|
| Serial port 2 | CN3 | VGA feature | CN8 |
| | | connector | |
|-----------------+----------+--------------------+----------|
| Serial port 1 | CN4 | CPU board | CN9 |
| | | connectors | |
|-----------------+----------+--------------------+----------|
| PS/2 mouse port | CN5 | Riser slot | SL1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| » | VGA IRQ9 disabled | J1 | Open |
|---+-----------------------------------+-------+------------|
| | VGA IRQ9 enabled | J1 | Closed |
|---+-----------------------------------+-------+------------|
| » | On board video disabled | J2 | Open |
|---+-----------------------------------+-------+------------|
| | On board video enabled | J2 | Closed |
|---+-----------------------------------+-------+------------|
| » | CMOS memory normal operation | J3 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | CMOS memory clear | J3 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Reset switch enabled | J4 | Closed |
|---+-----------------------------------+-------+------------|
| | Reset switch disabled | J4 | Open |
|---+-----------------------------------+-------+------------|
| | Parallel port unidirectional | J5 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Parallel port bidirectional | J5 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | J10 | Open |
|---+-----------------------------------+-------+------------|
| » | Monitor type select color | J11 | Closed |
|---+-----------------------------------+-------+------------|
| | Monitor type select monochrome | J11 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | J29 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | J30 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | J31 | Open |
|---+-----------------------------------+-------+------------|
| | VGAIOW select local | J35 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | VGAIOW select local & ISA | J35 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|--------+-------------+-------------+-------------+---------|
| 4MB | (1) 1M x 36 | None | None | None |
|--------+-------------+-------------+-------------+---------|
| 8MB | (1) 2M x 36 | None | None | None |
|--------+-------------+-------------+-------------+---------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | None | None |
|--------+-------------+-------------+-------------+---------|
| 12MB | (1) 2M x 36 | (1) 1M x 36 | None | None |
|--------+-------------+-------------+-------------+---------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 2M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 36 | (1) 1M x 36 | (1) 1M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 2M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 1M x 36 | (1) 2M x 36 | (1) 2M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 36 | (1) 2M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 2M x 36 | (1) 4M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 8M x 36 | None | None | None |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 8M x 36 | (1) 1M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 8M x 36 | (1) 1M x 36 | (1) 1M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 8M x 36 | (1) 2M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 2M x 36 | (1) 4M x 36 | (1) 4M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 2M x 36 | (1) 8M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 44MB | (1) 8M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 8M x 36 | (1) 2M x 36 | (1) 2M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 8M x 36 | (1) 4M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 8M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 56MB | (1) 8M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 56MB | (1) 2M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 8M x 36 | (1) 4M x 36 | (1) 4M x | None |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 | None | None |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Note: Board accepts 512KB/1MB of video memory. The |
| configuration is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J28 |
|----------------------------+-------------------------------|
| 512KB | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1MB | Pins 2 & 3 closed |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location |
|-------------------------------+----------------------------|
| CPU board connectors | CN9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 128KB | (4) 32K x 8 |
|----------------------------+-------------------------------|
| 256KB | (4) 64K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J103 | J104 |
|------------------+--------------------+--------------------|
| 128KB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 256KB | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | J109 | J110 | J111 | J112 |
|------------+------------+-----------+-----------+----------|
| 33MHz | Closed | Open | Open | Open |
|------------+------------+-----------+-----------+----------|
| 66iMHz | Closed | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | J114 | J115 |
|------------------+--------------------+--------------------|
| 80486SX | Pins 2 & 3 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX | Pins 1 & 2 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SECOND SOCKET SELECTION |
|------------------------------------------------------------|
| Setting | J101 | J102 | J103 |
|---------------+------------------+------------+------------|
| Not installed | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|---------------+------------------+------------+------------|
| ODP486 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|---------------+------------------+------------+------------|
| 80486DX | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
|---------------+------------------+------------+------------|
| 80486DX2 | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
IMG IMG 3
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location |
|-------------------------------+----------------------------|
| CPU board connectors | CN9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 128KB | (4) 32K x 8 |
|----------------------------+-------------------------------|
| 256KB | (4) 64K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J103 | J104 |
|------------------+--------------------+--------------------|
| 128KB | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 256KB | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | J109 | J110 | J111 | J112 |
|------------+------------+-----------+-----------+----------|
| 25MHz | Closed | Open | Open | Open |
|------------+------------+-----------+-----------+----------|
| 50iMHz | Closed | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SECOND SOCKET SELECTION |
|------------------------------------------------------------|
| Setting | J101 | J102 | J103 |
|---------------+------------------+------------+------------|
| Not installed | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|---------------+------------------+------------+------------|
| ODP486 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|---------------+------------------+------------+------------|
| 80486DX | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
|---------------+------------------+------------+------------|
| 80486DX2 | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+