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# INDUSTRIAL COMPUTER SOURCE
SB21064
Processor Alpha
Processor Speed 275/300MHz
Chip Set DEC
Video Chip Set None
Maximum Onboard 128MB
Memory
Maximum Video None
Memory
Cache 512/2048KB
BIOS Unidentified
Dimensions Unidentified
I/O Options Floppy drive interface, IDE interface, SCSI-2
interface, parallel port, PS/2 mouse
interface, serial ports (2), cache slots (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| SCSI-2 interface | J1 | Chassis fan | J14 |
| | | power | |
|---------------------+----------+----------------+----------|
| Speaker, keyboard, | J3 | IDE interface | J15 |
| keylock ,reset | | LED | |
|---------------------+----------+----------------+----------|
| IDE interface | J4 | PS/2 mouse | J19 |
| | | interface | |
|---------------------+----------+----------------+----------|
| Floppy drive | J5 | Serial port 1 | P1 |
| interface | | | |
|---------------------+----------+----------------+----------|
| Serial port 2 | J6 | Cache slots | SL1 & |
| | | | SL2 |
|---------------------+----------+----------------+----------|
| Parallel port | J11 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|----------------------------------+----------+--------------|
| | SCSI termination enabled | J10 | Open |
|---+------------------------------+----------+--------------|
| | SCSI termination disabled | J10 | Closed |
|---+------------------------------+----------+--------------|
| » | Flash BIOS memory update | J16 | Pins 2 & 3 |
| | enabled | | closed |
|---+------------------------------+----------+--------------|
| | Flash BIOS memory update | J16 | Pins 1 & 2 |
| | disabled | | closed |
|---+------------------------------+----------+--------------|
| | SROM debugger | J17/pins | Open |
| | | 23 & 24 | |
|---+------------------------------+----------+--------------|
| | Flash BIOS first image | J17/pins | Open |
| | booted | 25 & 26 | |
|---+------------------------------+----------+--------------|
| | Flash BIOS firmware image | J17/pins | Closed |
| | booted | 25 & 26 | |
|---+------------------------------+----------+--------------|
| | SROM test port | J18 | Unidentified |
|---+------------------------------+----------+--------------|
| | SCSI controller enabled | J20 | Pins 1 & 2 |
| | | | closed |
|---+------------------------------+----------+--------------|
| | SCSI controller disabled | J20 | Pins 2 & 3 |
| | | | closed |
|---+------------------------------+----------+--------------|
| » | Factory configured - do not | JP1 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 8MB | (2) 1M x 36 |
|----------------------------+-------------------------------|
| 16MB | (2) 2M x 36 |
|----------------------------+-------------------------------|
| 32MB | (2) 4M x 36 |
|----------------------------+-------------------------------|
| 64MB | (2) 8M x 36 |
|----------------------------+-------------------------------|
| 128MB | (2) 16M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: The sizes of the cache modules and orientation are |
| unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J13/pins 1 | J13/pins 3 | J13/pins 5 | J13/pins 7 |
| | & 2 | & 4 | & 6 | & 8 |
|-------+-------------+------------+------------+------------|
| None | Open | Open | Open | Open |
|-------+-------------+------------+------------+------------|
| 512KB | Open | Open | Open | Open |
|-------+-------------+------------+------------+------------|
| 2MB | Closed | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | J17/pins 11 & | J17/pins 13 /& | J17/pins 15 & |
| | 12 | 14 | 16 |
|-------+-----------------+-----------------+----------------|
| None | Closed | Closed | Closed |
|-------+-----------------+-----------------+----------------|
| 512KB | Open | Closed | Closed |
|-------+-----------------+-----------------+----------------|
| 2MB | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | J17/pins 17 & | J17/pins 19 & | J17/pins 21 & |
| | 18 | 20 | 22 |
|-------+-----------------+-----------------+----------------|
| 512KB | Closed | Open | Open |
|-------+-----------------+-----------------+----------------|
| 2MB | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | J17/pins 1 | J17/pins 3 | J17/pins 5 | J17/pins 7 |
| | & 2 | & 4 | & 6 | & 8 |
|--------+------------+------------+------------+------------|
| 275MHz | Closed | Open | Open | Open |
|--------+------------+------------+------------+------------|
| 300MHz | Closed | Open | Open | Open |
+------------------------------------------------------------+