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# FIRST INTERNATIONAL COMPUTER, INC.
486-GT
Processor CX486S/CX487S/80486SL/80486SX/CX486DX/80486DX/ODP486SX/
80486DX2/Pentium Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set VIA
Max. 96MB
Onboard
DRAM
Cache 64/128/256KB
BIOS Award
Dimensions 330mm x 218mm
I/O None
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+----------+---------------+----------|
| External battery | J1 | Reset switch | J8 |
|----------------------+----------+---------------+----------|
| Turbo switch | J2 | Speaker | J9 |
|----------------------+----------+---------------+----------|
| Green Power supply | J3 | Power LED & | J10 |
| connector | | keylock | |
|----------------------+----------+---------------+----------|
| Turbo LED | J6 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome, | J4 | Open |
| | EGA or VGA | | |
|---+----------------------------------+--------+------------|
| | Monitor type select color | J4 | Closed |
|---+----------------------------------+--------+------------|
| » | Adaptec ISA master installed | J5 | Closed |
|---+----------------------------------+--------+------------|
| | Adaptec ISA master not installed | J5 | Open |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | J7 | Open |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | J7 | Closed |
|---+----------------------------------+--------+------------|
| » | Cyrix clock 2 x mode | JC8 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Cyrix clock 1 x mode | JC8 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP1 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP3 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Pentium Overdrive write-back CPU | JT1 | pins 1 & 2 |
| | installed | | closed |
|---+----------------------------------+--------+------------|
| | Pentium Overdrive write-through | JT1 | pins 2 & 3 |
| | CPU installed | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JX1 | pins 1 & 2 |
| | alter | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 256K x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 1MB | NONE | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 1MB | NONE | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 2MB | NONE | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 3MB | (4) 256K x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 4MB | (4) 1M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 4MB | NONE | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 4MB | NONE | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | (4) 1M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (1) 1M x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | NONE | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | NONE | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (4) 256K x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (4) 256K x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (1) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | (1) 1M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 8MB | (1) 1M x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | NONE | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (4) 256K x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (1) 1M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (1) 1M x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 12MB | (1) 1M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | (1) 4M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 16MB | NONE | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 16MB | NONE | NONE | (1) 16M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CONT.) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 17MB | (4) 256K x 9 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (4) 256K x 9 | NONE | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 17MB | NONE | (1) 1M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 17MB | NONE | (1) 16M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 17MB | (1) 4M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (1) 4M x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (4) 256K x 9 | (1) 1M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (4) 256K x 9 | (1) 16M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (1) 4M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (1) 1M x 9 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 20MB | (1) 1M x 9 | NONE | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (1) 4M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 20MB | (1) 4M x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | NONE | (1) 4M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | NONE | (1) 16M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 256K x 9 | (1) 4M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 256K x 9 | (1) 16M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (1) 1M x 9 | (1) 1M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (1) 1M x 9 | (1) 16M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (1) 4M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (1) 4M x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (1) 1M x 9 | (1) 4M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (1) 1M x 9 | (1) 16M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (1) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (1) 4M x 9 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 32MB | (1) 4M x 9 | NONE | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 16M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 32M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 32MB | NONE | NONE | (1) 32M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 256K x 9 | (1) 16M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (1) 4M x 9 | (1) 1M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (1) 4M x 9 | (1) 16M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (1) 1M x 9 | (1) 16M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (1) 4M x 9 | (1) 4M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (1) 4M x 9 | (1) 16M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (1) 4M x 9 | (1) 16M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (1) 16M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 64MB | NONE | (1) 32M x 36 | (1) 32M x 36 |
|------------+---------------+---------------+---------------|
| 65MB | (1) 16M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 65MB | (1) 16M x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 66MB | (1) 16M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 68MB | (1) 16M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 68MB | (1) 16M x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 69MB | (1) 16M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 69MB | (1) 16M x 9 | (1) 4M x 36 | (1) 1M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CONT.) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 72MB | (1) 16M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 80MB | (1) 16M x 9 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 80MB | (1) 16M x 9 | NONE | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 81MB | (1) 16M x 9 | (1) 1M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 81MB | (1) 16M x 9 | (1) 16M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 84MB | (1) 16M x 9 | (1) 4M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 84MB | (1) 16M x 9 | (1) 16M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 96MB | (1) 16M x 9 | (1) 16M x 36 | (1) 16M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JS1 | JS2 | JS3 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JC1 | JC2 | JC3 | JC4 | JC5 | JC7 | JCX1 |
|--------------+-----+-----+------+------+------+-----+------|
| CX486S |2 & 3|2 & 3|Closed| Open | Open |1 & 2| Open |
|--------------+-----+-----+------+------+------+-----+------|
|CX486S/CX487S |1 & 2|1 & 2|Closed| Open | Open |1 & 2|Closed|
|--------------+-----+-----+------+------+------+-----+------|
| CX487S |1 & 2|1 & 2|Closed| Open | Open |1 & 2|Closed|
|--------------+-----+-----+------+------+------+-----+------|
| 80486SL |1 & 2|1 & 2|Closed| Open |Closed|1 & 2| Open |
|--------------+-----+-----+------+------+------+-----+------|
| 80486SX |2 & 3|2 & 3| Open | Open |Closed|1 & 2| Open |
|--------------+-----+-----+------+------+------+-----+------|
| CX486DX |1 & 2|1 & 2|Closed| Open | Open |1 & 2|Closed|
|--------------+-----+-----+------+------+------+-----+------|
| 80486DX |1 & 2|1 & 2|Closed| Open |Closed|1 & 2| Open |
|--------------+-----+-----+------+------+------+-----+------|
| ODP486SX |1 & 2|1 & 2|Closed| Open |Closed|1 & 2| Open |
|--------------+-----+-----+------+------+------+-----+------|
| 80486DX2 |1 & 2|1 & 2|Closed| Open |Closed|1 & 2| Open |
|--------------+-----+-----+------+------+------+-----+------|
| Pentium |1 & 2|1 & 2| Open |Closed| Open |2 & 3| Open |
| Overdrive | | | | | | | |
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CONT.) |
|------------------------------------------------------------|
| Type | JCX2 | JP2 | JX2 | RN12 | RN13 |
|------------+-------+-------+-------+-----------+-----------|
| CX486S | pins | pins | pins | Not | Installed |
| | 2 & 3 | 2 & 3 | 2 & 3 | installed | |
|------------+-------+-------+-------+-----------+-----------|
| 80486SL | pins | pins | pins | Installed | Not |
| | 1 & 2 | 2 & 3 | 2 & 3 | | installed |
|------------+-------+-------+-------+-----------+-----------|
| 80486SX | pins | pins | pins | Not | Not |
| | 1 & 2 | 2 & 3 | 2 & 3 | installed | installed |
|------------+-------+-------+-------+-----------+-----------|
| CX486DX | pins | pins | pins | Not | Installed |
| | 1 & 2 | 2 & 3 | 2 & 3 | installed | |
|------------+-------+-------+-------+-----------+-----------|
| 80486DX | pins | pins | pins | Not | Not |
| | 1 & 2 | 1 & 2 | 1 & 2 | installed | installed |
|------------+-------+-------+-------+-----------+-----------|
| ODP486SX | pins | pins | pins | Installed | Not |
| | 1 & 2 | 2 & 3 | 2 & 3 | | installed |
|------------+-------+-------+-------+-----------+-----------|
| 80486DX2 | pins | pins | pins | Not | Not |
| | 1 & 2 | 1 & 2 | 1 & 2 | installed | installed |
|------------+-------+-------+-------+-----------+-----------|
| Pentium | pins | pins | pins | Installed | Not |
| Overdrive | 1 & 2 | 1 & 2 | 1 & 2 | | installed |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JK1 | JK2 | JK3 | JK4 |
|--------+------------+------------+------------+------------|
| 25MHz | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 33MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 40MHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 50iMHz | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 50MHz | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 66iMHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| KEYBOARD CONTROL SELECT |
|------------------------------------------------------------|
| Keyboard | JX3 | RN1 | RN2 |
|----------+-----------------+---------------+---------------|
| Internal | pins 2 & 3 | Not installed | Installed |
| | closed | | |
|----------+-----------------+---------------+---------------|
| External | pins 1 & 2 | Installed | Not installed |
| | closed | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| When U15 is installed JP5 and JP6 should be set to pins 2 |
| & 3 closed. |
| |
| When U15 is not installed, JP5 and JP6 should be set to |
| pins 1 & 2 closed. |
| |
| The exact location for U15 is unknown. |
| |
| The exact function of X2 is unknown. |
+------------------------------------------------------------+