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# INTERCOMP, INC.
486 PERSONAL WORKSTATION
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/80586SX
Processor 20/25/33/50(Internal)/50/66(Internal)MHz
Speed
Chip Set Intercomp/OPTI
Max. onboard 64MB
DRAM
SRAM Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2), 10 base T
ethernet
floppy drive interface, IDE interface, parallel
port
serial port (2), VGA port, VGA feature connector
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | P5 | VGA feature | P21 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Serial port | P7 | Keylock | P31A |
| (COM2) | | | |
|------------------+----------+-------------------+----------|
| Serial port | P8 | Speaker | P31B |
| (COM1) | | | |
|------------------+----------+-------------------+----------|
| IDE interface | P9 | IDE interface LED | P31D |
|------------------+----------+-------------------+----------|
| Parallel port | P10 | Turbo LED | P31E |
|------------------+----------+-------------------+----------|
| Floppy drive | P11 | Turbo Switch | P31F |
| interface | | | |
|------------------+----------+-------------------+----------|
| 10 base T | P18 | Reset | P31G |
| ethernet | | | |
|------------------+----------+-------------------+----------|
| VGA Port | P20 | 32-bit VESA local | S1 & S2 |
| | | bus slots | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------+--------+--------------------|
| » | CMOS memory normal | P3 | Open |
| | operation | | |
|---+--------------------------+--------+--------------------|
| | CMOS memory clear | P3 | Closed |
|---+--------------------------+--------+--------------------|
| » | VESA bus enabled | P13 | Pins 1 & 2, 3 & 5, |
| | | | 4 & 6 closed |
|---+--------------------------+--------+--------------------|
| | VESA bus disabled | P13 | Pins 1 & 2, 5 & 7, |
| | | | 6 & 8 closed |
|---+--------------------------+--------+--------------------|
| » | IDE select single mode | P19 | Pins 1 & 2 closed |
|---+--------------------------+--------+--------------------|
| | IDE select master/slave | P19 | Pins 1 & 2 open |
| | mode | | |
|---+--------------------------+--------+--------------------|
| » | LPT select output mode | P19 | Pins 3 & 4 closed |
|---+--------------------------+--------+--------------------|
| | LPT select input/output | P19 | Pins 3 & 4 closed |
| | mode | | |
|---+--------------------------+--------+--------------------|
| » | Factory configured do | P22 | Pins 2 & 3 closed |
| | not alter | | |
|---+--------------------------+--------+--------------------|
| » | VESA bus VGA controller | P23 | Pins 2 & 3 closed |
| | enabled | | |
|---+--------------------------+--------+--------------------|
| | VESA bus VGA controller | P23 | Pins 1 & 2 closed |
| | disabled | | |
|---+--------------------------+--------+--------------------|
| » | Factory configured do | P24 | Pins 2 & 3 closed |
| | not alter | | |
|---+--------------------------+--------+--------------------|
| » | Factory configured do | P25 | Pins 1 & 2 closed |
| | not alter | | |
|---+--------------------------+--------+--------------------|
| » | Factory configured do | P26 | Pins 2 & 3 closed |
| | not alter | | |
|---+--------------------------+--------+--------------------|
| » | Monitor type select | P31C | Open |
| | color | | |
|---+--------------------------+--------+--------------------|
| | Monitor type select | P31C | Closed |
| | monochrome | | |
|------------------------------------------------------------|
| Note: VESA bus should be disabled for 50MHz CPU speed |
| operation. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE (ID2) CONFIGURATION |
|------------------------------------------------------------|
| Wait states | CPU speed | P14 (ID2) |
|--------------------+------------------+--------------------|
| 0 wait states | £ 33MHz | Pins 1 & 2 open |
|--------------------+------------------+--------------------|
| 1 wait state | > 33MHz | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA BUS SPEED (ID3) CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | P14 (ID3) |
|----------------------------+-------------------------------|
| £ 33MHz | Pins 3 & 4 open |
|----------------------------+-------------------------------|
| > 33MHz | Pins 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+--------------+------------+------------+------------|
| 1MB | (4) 256K x 9 | NONE | NONE | NONE |
|------+--------------+------------+------------+------------|
| 2MB | (4) 256K x 9 | (4) 256K x | NONE | NONE |
| | | 9 | | |
|------+--------------+------------+------------+------------|
| 3MB | (4) 256K x 9 | (4) 256K x | (4) 256K x | NONE |
| | | 9 | 9 | |
|------+--------------+------------+------------+------------|
| 4MB | (4) 256K x 9 | (4) 256K x | (4) 256K x | (4) 256K x |
| | | 9 | 9 | 9 |
|------+--------------+------------+------------+------------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|------+--------------+------------+------------+------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 | NONE | NONE |
|------+--------------+------------+------------+------------|
| 6MB | (4) 256K x 9 | (4) 256K x | (4) 1M x 9 | NONE |
| | | 9 | | |
|------+--------------+------------+------------+------------|
| 7MB | (4) 256K x 9 | (4) 256K x | (4) 256K x | (4) 1M x 9 |
| | | 9 | 9 | |
|------+--------------+------------+------------+------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
|------+--------------+------------+------------+------------|
| 9MB | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
|------+--------------+------------+------------+------------|
| 10MB | (4) 256K x 9 | (4) 256K x | (4) 1M x 9 | (4) 1M x 9 |
| | | 9 | | |
|------+--------------+------------+------------+------------|
| 12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
|------+--------------+------------+------------+------------|
| 13MB | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------+--------------+------------+------------+------------|
| 16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------+--------------+------------+------------+------------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|------+--------------+------------+------------+------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 | NONE | NONE |
|------+--------------+------------+------------+------------|
| 18MB | (4) 256K x 9 | (4) 256K x | (4) 4M x 9 | NONE |
| | | 9 | | |
|------+--------------+------------+------------+------------|
| 19MB | (4) 256K x 9 | (4) 256K x | (4) 256K x | (4) 4M x 9 |
| | | 9 | 9 | |
|------+--------------+------------+------------+------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
|------+--------------+------------+------------+------------|
| 21MB | (4) 256K x 9 | (4) 1M x 9 | (4) 4M x 9 | NONE |
|------+--------------+------------+------------+------------|
| 22MB | (4) 256K x 9 | (4) 256K x | (4) 1M x 9 | (4) 4M x 9 |
| | | 9 | | |
|------+--------------+------------+------------+------------|
| 24MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | NONE |
|------+--------------+------------+------------+------------|
| 25MB | (4) 256K x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 |
|------+--------------+------------+------------+------------|
| 28MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 |
|------+--------------+------------+------------+------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
|------+--------------+------------+------------+------------|
| 33MB | (4) 256K x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|------+--------------+------------+------------+------------|
| 36MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
|------+--------------+------------+------------+------------|
| 37MB | (4) 256K x 9 | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------+--------------+------------+------------+------------|
| 40MB | (4) 1M x 9 | (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 | NONE |
|------+--------------+------------+------------+------------|
| 49MB | (4) 256K x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------+--------------+------------+------------+------------|
| 52MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------+--------------+------------+------------+------------|
| 64MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | Location | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 16K x 4 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 16K x 4 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 16K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | P15 |
|---------+--------------------------------------------------|
| 64KB | Pins 3 & 5, 4 & 6, 7 & 8 closed |
|---------+--------------------------------------------------|
| 128KB | Pins 1 & 3, 2 & 4, 7 & 8, 9 & 10 closed |
|---------+--------------------------------------------------|
| 256KB | Pins 3 & 5, 4 & 6, 7 & 8, 9 & 10, 11 & 12 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO START UP CONFIGURATION |
|------------------------------------------------------------|
| Mode | P27 | P28 | P29 |
|---------------+--------------+--------------+--------------|
| 640 x 480, | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| 60Hz | closed | closed | closed |
|---------------+--------------+--------------+--------------|
| 640 x 480, | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 |
| 70Hz | closed | closed | closed |
|---------------+--------------+--------------+--------------|
| 800 x 600, | Pins 1 & 2 | Pins 1 & 2 | Pins 2 & 3 |
| 56Hz | closed | closed | closed |
|---------------+--------------+--------------+--------------|
| 800 x 600, | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| 60Hz | closed | closed | closed |
|---------------+--------------+--------------+--------------|
| 800 x 600, | Pins 2 & 3 | Pins 2 & 3 | Pins 1 & 2 |
| 70Hz | closed | closed | closed |
|---------------+--------------+--------------+--------------|
| 1024 x 768, | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| 43Hz | closed | closed | closed |
|---------------+--------------+--------------+--------------|
| 1024 x 768, | Pins 1 & 2 | Pins 2 & 3 | Pins 2 & 3 |
| 60Hz | closed | closed | closed |
|---------------+--------------+--------------+--------------|
| 1024 x 768, | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| 70Hz | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O BASE ADDRESS AND BASE MEMORY ADDRESS |
|------------------------------------------------------------|
| I/O Address | Base Memory Address | P33 | P34 |
|---------------+---------------------+-----------+----------|
| 300h | D8000h | Closed | Closed |
|---------------+---------------------+-----------+----------|
| 320h | CC000h | Open | Closed |
|---------------+---------------------+-----------+----------|
| 340h | D0000h | Closed | Open |
|---------------+---------------------+-----------+----------|
| 360h | D4000h | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE AND SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | Speed | P16 | P17 | P30 |
|----------+---------+------------+-------------+------------|
| 80486SX | 20MHz | Pins 3 & 4 | Pins 3 & 5, | Pins 1 & 2 |
| | | closed | 4 & 6 | closed |
| | | | closed | |
|----------+---------+------------+-------------+------------|
| 80486SX | 25MHz | Open | Pins 3 & 5, | Pins 1 & 2 |
| | | | 4 & 6 | closed |
| | | | closed | |
|----------+---------+------------+-------------+------------|
| 80487SX | 20MHz | Pins 3 & 4 | Pins 3 & 5, | Pins 2 & 3 |
| | | closed | 4 & 6 | closed |
| | | | closed | |
|----------+---------+------------+-------------+------------|
| 80487SX | 25MHz | Open | Pins 3 & 5, | Pins 2 & 3 |
| | | | 4 & 6 | closed |
| | | | closed | |
|----------+---------+------------+-------------+------------|
| 80486DX | 25MHz | Open | Pins 3 & 5, | Pins 2 & 3 |
| | | | 4 & 6 | closed |
| | | | closed | |
|----------+---------+------------+-------------+------------|
| 80486DX | 33MHz | Pins 1 & 2 | Pins 3 & 5, | Pins 2 & 3 |
| | | closed | 4 & 6 | closed |
| | | | closed | |
|----------+---------+------------+-------------+------------|
| 80486DX | 50MHz | Open | Pins 1 & 3, | Pins 2 & 3 |
| | | | 2 & 4 | closed |
| | | | closed | |
|----------+---------+------------+-------------+------------|
| 80486DX2 | 50i MHz | Open | Pins 3 & 5, | Pins 2 & 3 |
| | | | 4 & 6 | closed |
| | | | closed | |
|----------+---------+------------+-------------+------------|
| 80486DX2 | 66i MHz | Pins 1 & 2 | Pins 3 & 5, | Pins 2 & 3 |
| | | closed | 4 & 6 | closed |
| | | | closed | |
+------------------------------------------------------------+