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# LASER COMPUTER, INC.
LASER 486 MODULAR EISA
Processor 80486SX/80487SX/80486DX/80486DX2
Processor 16/20/25/33/50(internal)/66(internal)MHz
Speed
Chip Set Unidentified
Max. Onboard 96MB (with two memory cards installed)
DRAM
Cache 64/128KB
BIOS Unidentified
Dimensions 330mm x 220mm
I/O Options External memory cards (2), external CPU card,
PS/2 mouse port
NPU Options 4167
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| PS/2 mouse | J7 | Diagnostic | J32 |
| connector | | connector | |
|------------------+----------+-------------------+----------|
| Speaker | J9 | External memory | SL1 & |
| | | cards | SL2 |
|------------------+----------+-------------------+----------|
| Front panel | J10 | External CPU card | SL3 |
| connector | | | |
|------------------+----------+-------------------+----------|
| External battery | J12 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | EISA bus controller speed select | JP1 | Closed |
| | 25MHz | | |
|---+----------------------------------+--------+------------|
| | EISA bus controller speed select | JP1 | Open |
| | 33MHz | | |
|---+----------------------------------+--------+------------|
| » | BIOS type select 27512 | JP2 | Closed |
|---+----------------------------------+--------+------------|
| | BIOS type select 27010 | JP2 | Open |
|---+----------------------------------+--------+------------|
| » | Battery type select internal | JP3 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Battery type select external | JP3 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Real time clock select MC146818A | JP4 | Closed |
|---+----------------------------------+--------+------------|
| | Real time clock select MC146818 | JP4 | Open |
| | or HD146818 | | |
|---+----------------------------------+--------+------------|
| » | Parity check enabled | JP5 | Closed |
|---+----------------------------------+--------+------------|
| | Parity check disabled | JP5 | Open |
+------------------------------------------------------------+
(IMG) IMG 2
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 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 |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE |
|------------+---------------+---------------+---------------|
| 9MB | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 16MB | (4) 4M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 16MB | (4) 4M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 | NONE |
|------------+---------------+---------------+---------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE |
|------------+---------------+---------------+---------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 | NONE |
|------------+---------------+---------------+---------------|
| 24MB | (4) 4M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 256K x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------------------------------------------------------------|
| Note: In order to have 96MB, use two memory cards. |
+------------------------------------------------------------+
(IMG) IMG 3
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location |
|-------------------------------+----------------------------|
| Chassis fan power | J2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|---------------------------------------+---------+----------|
| » | Factory configured - do not alter | JP2 | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|----------------+----------------------+--------------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 |
|----------------+----------------------+--------------------|
| 128KB | (4) 32K x 8 | NONE |
|------------------------------------------------------------|
| Note: The orientation of the cache banks are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 |
|--------------------------+---------------------------------|
| 80486SX | pins 5 & 6 closed |
|--------------------------+---------------------------------|
| 80487SX | pins 2 & 3, 4 & 5, 6 & 7 closed |
|--------------------------+---------------------------------|
| 80486DX | pins 1 & 2, 4 & 5, 6 & 7 closed |
|--------------------------+---------------------------------|
| 80486DX2 | pins 1 & 2, 4 & 5, 6 & 7 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP3 | JP4 | JP5 |
|---------------+--------------+--------------+--------------|
| 16MHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 20MHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 25MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Open | Open |
+------------------------------------------------------------+