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# LEADING TECHNOLOGY
5500AT
Processor 80286 (Exact location is unknown)
Processor 8/10/12/16/20/25MHz
Speed
Chip Set SIS
Max. Onboard 5MB
DRAM
Cache None
BIOS AMI
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, IDE interface, Joystick
port, parallel port,
NPU Options 80287
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Parallel port | CN1 | IDE interface | J10 |
|---------------------+----------+----------------+----------|
| Joystick port | CN2 | Floppy drive | J12 |
| | | interface | |
|---------------------+----------+----------------+----------|
| Serial port 2 (25 | CN3 | Speaker | J15 |
| pin) | | | |
|---------------------+----------+----------------+----------|
| Serial port 1 (9 | CN4 | IDE interface | J29 |
| pin) | | LED | |
|---------------------+----------+----------------+----------|
| Function panel | J4 | Riser Card | S1 |
| connector | | | |
|---------------------+----------+----------------+----------|
| External battery | J9 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|---------------------------------+---------------+----------|
| » | Joystick port enabled | J17 | closed |
|---+-----------------------------+---------------+----------|
| | Joystick port disabled | J17 | open |
|---+-----------------------------+---------------+----------|
| » | IDE interface enabled | J28 | open |
|---+-----------------------------+---------------+----------|
| | IDE interface disabled | J28 | closed |
|---+-----------------------------+---------------+----------|
| » | Floppy drive interface | J33 | closed |
| | enabled | | |
|---+-----------------------------+---------------+----------|
| | Floppy drive interface | J33 | open |
| | disabled | | |
|---+-----------------------------+---------------+----------|
| » | Parity enabled | J34 | closed |
|---+-----------------------------+---------------+----------|
| | Parity disabled | J34 | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (8) 441100 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 1MB | (4) 256K x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 | NONE |
|------------+---------------+---------------+---------------|
| 3MB | (4) 256K x 9 | (4) 256K x 9 | (4) 256K x 9 |
|------------+---------------+---------------+---------------|
| 4MB | (4) 1M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT CONFIGURATION |
|------------------------------------------------------------|
| Port 1 | Port 2 | J20 | J22 | J25 | J26 |
| (CN4) | (CN2) | | | | |
|-----------+------------+--------+--------+--------+--------|
| » | COM1 | COM2 | pins 2 | pins 1 | Open | Open |
| | | | & 3 | & 2 | | |
|---+-------+------------+--------+--------+--------+--------|
| | COM1 | COM3 | pins 2 | Open | pins 1 | Open |
| | | | & 3 | | & 2 | |
|---+-------+------------+--------+--------+--------+--------|
| | COM1 | COM4 | pins 2 | Open | Open | pins 1 |
| | | | & 3 | | | & 2 |
|---+-------+------------+--------+--------+--------+--------|
| | COM2 | COM1 | pins 1 | pins 2 | Open | Open |
| | | | & 2 | & 3 | | |
|---+-------+------------+--------+--------+--------+--------|
| | COM2 | COM3 | Open | pins 2 | pins 1 | Open |
| | | | | & 3 | & 2 | |
|---+-------+------------+--------+--------+--------+--------|
| | COM2 | COM4 | Open | pins 2 | Open | pins 1 |
| | | | | & 3 | | & 2 |
|---+-------+------------+--------+--------+--------+--------|
| | COM3 | COM1 | pins 1 | Open | pins 2 | Open |
| | | | & 2 | | & 3 | |
|---+-------+------------+--------+--------+--------+--------|
| | COM3 | COM2 | Open | pins 1 | pins 2 | Open |
| | | | | & 2 | & 3 | |
|---+-------+------------+--------+--------+--------+--------|
| | COM3 | COM4 | Open | Open | pins 2 | pins 1 |
| | | | | | & 3 | & 2 |
|---+-------+------------+--------+--------+--------+--------|
| | COM4 | COM1 | pins 2 | Open | Open | pins 1 |
| | | | & 3 | | | & 2 |
|---+-------+------------+--------+--------+--------+--------|
| | COM4 | COM2 | Open | pins 1 | Open | pins 2 |
| | | | | & 2 | | & 3 |
|---+-------+------------+--------+--------+--------+--------|
| | COM4 | COM3 | Open | Open | pins 1 | pins 2 |
| | | | | | & 2 | & 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed |
| position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT IRQ CONFIGURATION |
|------------------------------------------------------------|
| Port 1 | Port 2 (CN2) | J18 | J19 |
| (CN1) | | | |
|------------+--------------+-------------------+------------|
| » | IRQ4 | IRQ3 | pins 2 & 3 closed | pins 1 & 2 |
| | | | | closed |
|----+-------+--------------+-------------------+------------|
| | IRQ3 | IRQ4 | pins 1 & 2 closed | pins 2 & 3 |
| | | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT CONFIGURATION |
|------------------------------------------------------------|
| LPT | IRQ | J16 | J21 |
|-----------+--------+-------------------+-------------------|
| » | 1 | 7 | pins 2 & 3 closed | pins 2 & 3 closed |
|---+-------+--------+-------------------+-------------------|
| | 1 | 5 | pins 2 & 3 closed | pins 1 & 2 closed |
|---+-------+--------+-------------------+-------------------|
| | 2 | 7 | pins 1 & 2 closed | pins 2 & 3 closed |
|---+-------+--------+-------------------+-------------------|
| | 2 | 5 | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+