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# DIGITAL EQUIPMENT CORPORATION
PERSONAL WORKSTATION 266I
Device Type Mainboard
Processor Pentium II
Processor Speed 233/266/300/333MHz
Chip Set Intel
Video Chip Set None
Maximum Onboard 512MB (EDO supported)
Memory
Maximum Video None
Memory
Cache 128KB (located on Pentium II CPU)
BIOS Unidentified
Dimensions 254mm x 218mm
I/O Options (CPU) Parallel port, PS/2 mouse port, serial
ports (2), USB connectors (2)
I/O Options IDE interfaces (2), floppy drive interface,
(backplane) 100Base-T connector, game/MIDI port, audio
in – CD-ROM, fax/modem connector, 32-bit
PCI slots (4)
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Serial port | CN1 | USB connector 2 | CN4 |
|-------------------+----------+------------------+----------|
| Serial port | CN2 | PS/2 mouse port | CN5 |
|-------------------+----------+------------------+----------|
| USB connector 1 | CN3 | Parallel port | CN6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|----------------------------------+-------+-----------------|
| » | Boot block update disabled | J27 | Pins 1 & 2 |
| | | | closed |
|---+------------------------------+-------+-----------------|
| | Boot block update enabled | J27 | Pins 2 & 3 |
| | | | closed |
|---+------------------------------+-------+-----------------|
| » | Password disabled | SW1/5 | Off |
|---+------------------------------+-------+-----------------|
| | Password enabled | SW1/5 | On |
|---+------------------------------+-------+-----------------|
| » | BIOS normal operation | SW1/6 | Off |
|---+------------------------------+-------+-----------------|
| | BIOS recovery mode | SW1/6 | On |
|---+------------------------------+-------+-----------------|
| » | CMOS memory normal operation | SW1/7 | Off |
|---+------------------------------+-------+-----------------|
| | CMOS memory clear | SW1/7 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 16MB | (2) 2M x 36 | None | None | None |
|-------+-------------+------------+------------+------------|
| 32MB | (2) 4M x 36 | None | None | None |
|-------+-------------+------------+------------+------------|
| 32MB | (2) 2M x 36 | (2) 2M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 48MB | (2) 4M x 36 | (2) 2M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 48MB | (2) 2M x 36 | (2) 2M x | (2) 2M x | None |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 64MB | (2) 2M x 36 | (2) 2M x | (2) 2M x | (2) 2M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (2) 8M x 36 | None | None | None |
|-------+-------------+------------+------------+------------|
| 64MB | (2) 4M x 36 | (2) 4M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 80MB | (2) 8M x 36 | (2) 2M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 96MB | (2) 8M x 36 | (2) 4M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 96MB | (2) 4M x 36 | (2) 4M x | (2) 4M x | None |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 128MB | (2) 16M x | None | None | None |
| | 36 | | | |
|-------+-------------+------------+------------+------------|
| 128MB | (2) 8M x 36 | (2) 8M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 128MB | (2) 4M x 36 | (2) 4M x | (2) 4M x | (2) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 144MB | (2) 16M x | (2) 2M x | None | None |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 160MB | (2) 16M x | (2) 4M x | None | None |
| | 36 | 36 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 176MB | (2) 16M x | (2) 2M x | (2) 2M x | (2) 2M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 192MB | (2) 16M x | (2) 8M x | None | None |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 192MB | (2) 8M x 36 | (2) 8M x | (2) 8M x | None |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 224MB | (2) 16M x | (2) 4M x | (2) 4M x | (2) 4M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 256MB | (2) 16M x | (2) 16M x | None | None |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 256MB | (2) 8M x 36 | (2) 8M x | (2) 8M x | (2) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 288MB | (2) 16M x | (2) 16M x | (2) 2M x | (2) 2M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 320MB | (2) 16M x | (2) 16M x | (2) 4M x | (2) 4M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 320MB | (2) 16M x | (2) 8M x | (2) 8M x | (2) 8M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 384MB | (2) 16M x | (2) 16M x | (2) 16M x | None |
| | 36 | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 512MB | (2) 16M x | (2) 16M x | (2) 16M x | (2) 16M x |
| | 36 | 36 | 36 | 36 |
|------------------------------------------------------------|
| Note: Board accepts EDO memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: 128KB cache is located on the Pentium II CPU. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
|CPU speed| Clock |Multiplier|SW1/1|SW1/2|SW1/3|SW1/4|SW1/8|
| | speed | | | | | | |
|---------+---------+----------+-----+-----+-----+-----+-----|
| 233MHz | 66MHz | 3.5x | On | Off | Off | On | On |
|---------+---------+----------+-----+-----+-----+-----+-----|
| 266MHz | 66MHz | 4x | On | On | On | Off | On |
|---------+---------+----------+-----+-----+-----+-----+-----|
| 300MHz | 66MHz | 4.5x | On | Off | On | Off | On |
|---------+---------+----------+-----+-----+-----+-----+-----|
| 333MHz | 66MHz | 5x | On | On | Off | Off | On |
+------------------------------------------------------------+
(IMG) IMG 2
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Main logic board | CN1 | Control panel | CN11 |
| connectors | | connector | |
|-------------------+----------+------------------+----------|
| IDE interface 1 | CN2 | Audio in – | CN12 |
| | | CD-ROM | |
|-------------------+----------+------------------+----------|
| IDE interface 2 | CN3 | Fax/modem | CN13 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Floppy drive | CN4 | Audio connector | CN14 |
| interface | | | |
|-------------------+----------+------------------+----------|
| 100Base-T | CN5 | Power connector | P1 |
| connector | | | |
|-------------------+----------+------------------+----------|
| IDE interface LED | CN6 | 5v power | P2 |
|-------------------+----------+------------------+----------|
| 10Base-T | CN7 | 3.3v power | P3 |
| connector | | | |
|-------------------+----------+------------------+----------|
| Chassis fan power | CN8 | 32-bit PCI slots | PC1 – |
| | | | PC2 |
|-------------------+----------+------------------+----------|
| Chassis fan power | CN9 | 32-bit PCI slots | SL1 & |
| | | (full size) | SL2 |
|-------------------+----------+------------------+----------|
| Game/MIDI port | CN10 | | |
+------------------------------------------------------------+