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# INFORMTECH INTERNATIONAL, INC.
IT286SB
Processor 80286
Processor Speed 5/6/8/10MHz
Chip Set C & T
Max. Onboard DRAM 1MB
SRAM Cache None
BIOS Unknown
Dimensions 330mm x 218mm
I/O Options None
NPU Options 80287
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Speaker | J13 | External battery | J18 |
|-------------------+----------+------------------+----------|
| Power LED & | J16 | Turbo LED | J20 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Reset switch | J17 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Power good signal detect from | J23 | pins 1 & 2 |
| | power supply | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | J23 | pins 2 & 3 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| » | CPU speed software selectable | SW1 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU speed select 5.33/6.7MHz | SW1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU speed select 8/10MHz | SW1 | open |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | SW2 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select color | SW2 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Jumper W4 | Jumper W5 |
|------------+-----------+-----------+-----------+-----------|
| | 256KB | (18) 4164 | (18) 4164 | pins 1 & | pins 1 & |
| | | | | 2 closed | 2 closed |
|---+--------+-----------+-----------+-----------+-----------|
| | 512KB | (18) | NONE | pins 2 & | pins 1 & |
| | | 41256 | | 3 closed | 2 closed |
|---+--------+-----------+-----------+-----------+-----------|
| » | 640KB | (18) | (18) 4164 | pins 1 & | pins 2 & |
| | | 41256 | | 2 closed | 3 closed |
|---+--------+-----------+-----------+-----------+-----------|
| | 1024KB | (18) | (18) | pins 2 & | pins 2 & |
| | | 41256 | 41256 | 3 closed | 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| NPU CLOCK RATE CONFIGUARATION |
|------------------------------------------------------------|
| NPU | Clock Rate | Jumper W7 | Jumper W8 |
|-----------+---------------+------------+-------------------|
| 80287-6 | 3.6/5.33MHz | closed | pins 1 & 2 closed |
|-----------+---------------+------------+-------------------|
| 80287-6 | 4.46MHz | closed | pins 1 & 2 closed |
|-----------+---------------+------------+-------------------|
| 80287-8 | 5.33/8MHz | open | pins 2 & 3 closed |
|-----------+---------------+------------+-------------------|
| 80287-8 | 4.46/6.67MHz | closed | pins 1 & 2 closed |
|-----------+---------------+------------+-------------------|
| 80287-10 | 6.67/10MHz | open | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS TYPE CONFIGURATION |
|------------------------------------------------------------|
| BIOS | Size | Jumper W2 | Jumper W3 |
|-----------+--------------+----------------+----------------|
| » | 27128 | 32K EPROM | pins 2 & 3 | pins 1 & 2 |
| | | | closed | closed |
|---+-------+--------------+----------------+----------------|
| | 27256 | 64K EPROM | pins 1 & 2 | pins 1 & 2 |
| | | | closed | closed |
|---+-------+--------------+----------------+----------------|
| | 23128 | 32K MASK ROM | pins 2 & 3 | pins 2 & 3 |
| | | | closed | closed |
|---+-------+--------------+----------------+----------------|
| | 23256 | 64K MASK ROM | pins 1 & 2 | pins 2 & 3 |
| | | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BATTERY TYPE CONFIGUARATION |
|------------------------------------------------------------|
| Battery | J21 | J22 |
|-------------------------------+-------------------+--------|
| » | Internal lithium (2 x | pins 1 & 2 closed | open |
| | 3VDC) | | |
|---+---------------------------+-------------------+--------|
| | External lithium (6VDC) | open | closed |
|---+---------------------------+-------------------+--------|
| | External alkaline (6VDC) | open | open |
+------------------------------------------------------------+