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# INFORMTECH INTERNATIONAL, INC.
IT486SL-50MHz Ver. 2.0
Processor 80486SX/80487SX/80486DX
Processor Speed 20/25/33/50MHz
Chip Set OPTI
Max. Onboard DRAM 40MB
SRAM Cache 64/256KB
BIOS OPTI
Dimensions 218mm x 330mm
I/O Options Auxiliary keyboard connector
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | J11 | Turbo LED | JP11 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | J20 | Reset switch | SW1 |
|---------------------+----------+----------------+----------|
| Speaker | J21 | Turbo switch | SW2 |
|---------------------+----------+----------------+----------|
| Auxiliary keyboard | J22 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome | JP2 | open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP2 | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP6 | open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | External battery type select | JP14 | pins 1 & 3 |
| | lithium 3.6VDC | | closed |
|---+----------------------------------+--------+------------|
| | External battery type select | JP14 | pins 1 & 2 |
| | alkaline 4.5VDC | | closed |
|---+----------------------------------+--------+------------|
| | External battery type select | JP14 | pins 3 & 4 |
| | four pack AA 6VDC | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP15 | open |
| | alter | | |
|---+----------------------------------+--------+------------|
| | I/O bus select zero wait states | JP16 | closed |
| | | | |
| | | JP17 | closed |
|---+----------------------------------+--------+------------|
| | I/O bus select one wait state | JP16 | closed |
| | | | |
| | | JP17 | open |
|---+----------------------------------+--------+------------|
| | I/O bus select two wait states | JP16 | open |
| | | | |
| | | JP17 | closed |
|---+----------------------------------+--------+------------|
| | I/O bus select three wait states | JP16 | open |
| | | | |
| | | JP17 | open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP18 | open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (4) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (4) 256K x | (4) 256K x | NONE | NONE |
| | 9 | 9 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 5MB | (4) 256K x | (4) 1M x 9 | NONE | NONE |
| | 9 | | | |
|------+-------------+-------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 24MB | (4) 1M x 9 | (4) 4M x 9 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 28MB | (4) 1M x 9 | (4) 4M x 9 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 36MB | (4) 4M x 9 | (4) 4M x 9 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 40MB | (4) 4M x 9 | (4) 4M x 9 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | JP3 | JP4 | JP5 |
|-----------+-------------------+--------+-------------------|
| 80486DX | pins 2 & 3 closed | closed | pins 1 & 2 closed |
|-----------+-------------------+--------+-------------------|
| 80487SX | pins 1 & 2 closed | closed | pins 1 & 2 closed |
|-----------+-------------------+--------+-------------------|
| 80486SX | open | open | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP9 | JP10 | JP12 |
|--------------+---------------+--------------+--------------|
| 64KB | open | open | open |
|--------------+---------------+--------------+--------------|
| 256KB | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG | Dirty Bit (U64) |
|----------+---------------+---------------+-----------------|
| 64KB | (8) 8K x 8 | (2) 16K x 4 | (1) 64K x 1 |
|----------+---------------+---------------+-----------------|
| 256KB | (8) 32K x 8 | (2) 16K x 4 | (1) 64K x 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU Speed | JP7 | JP13 |
|------------------+--------------------+--------------------|
| 50MHz | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 33MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 25MHz | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+