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# FORCOM TECHNOLOGY CORPORATION
419R
Processor 80486SX/CX486S/80487SX/80486S2/80486DX/Am486DX/CX486DX/
ODP486SX/80486DX2/AM486DX2/CX486DX2/80486DX4/Pentium Overdrive
Processor 20/25/33/40/50/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set OPTI
Max. 128MB
Onboard
DRAM
Cache 64/128/256/512KB
BIOS AMI
Dimensions 220mm x 260mm
I/O 32-bit VESA local bus slots (3), green PC feature
Options
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+--------------------+-------------|
| External | J1 | Green monitor | JP63 |
| battery | | power supply | |
|--------------+----------+--------------------+-------------|
| Power LED & | JP2 | External power | JP68 |
| keylock | | management | |
| | | interface | |
|--------------+----------+--------------------+-------------|
| Turbo LED | JP16 | Reset switch | S1 |
|--------------+----------+--------------------+-------------|
| Turbo switch | JP17 | 32-bit VESA Local | SL1,SL2,SL3 |
| | | bus slots | |
|--------------+----------+--------------------+-------------|
| Speaker | JP18 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+--------+-------------|
| » | Monitor type select color | JP30 | Closed |
|---+---------------------------------+--------+-------------|
| | Monitor type select monochrome | JP30 | Open |
|---+---------------------------------+--------+-------------|
| » | Normal CPU ADS# operation | JP36 | pins 2 & 3 |
|---+---------------------------------+--------+-------------|
| | Delay CPU ADS# clock operation | JP36 | pins 1 & 2 |
|---+---------------------------------+--------+-------------|
| » | Power to CPU set at 5V | JP64 | pins 1 & 3, |
| | | | 2 & 4 |
|---+---------------------------------+--------+-------------|
| | Power to CPU set at 3.3V (for | JP64 | pins 4 & 6, |
| | Intel DX4 CPU) | | 3 & 5 |
|---+---------------------------------+--------+-------------|
| » | Set CPU external operation | JP65 | Open |
| | clock to 3X | | |
|---+---------------------------------+--------+-------------|
| | Set CPU external operation | JP65 | Closed |
| | clock to 2X | | |
|---+---------------------------------+--------+-------------|
| » | Cache size enabled 64KB or | JP67 | Closed |
| | 256KB | | |
|---+---------------------------------+--------+-------------|
| | Cache size enabled 128KB or | JP67 | Open |
| | 512KB | | |
|------------------------------------------------------------|
| Note:Jumper JP65, for any type of CPU other than above |
| listed, leave "Open". |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+------------+---------------+--------------+--------|
| 1MB | (4) 256K x | NONE | NONE | NONE |
| | 9 | | | |
|-------+------------+---------------+--------------+--------|
| 2MB | (1) 256K x | NONE | (1) 256K x | NONE |
| | 36 | | 36 | |
|-------+------------+---------------+--------------+--------|
| 4MB | (4) 1M x 9 | NONE | NONE | NONE |
|-------+------------+---------------+--------------+--------|
| 4MB | (1) 512K x | (1) 512K x 36 | | |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 4MB | (1) 1M x | NONE | NONE | NONE |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 6MB | (1) 512K x | (1) 1M x 36 | NONE | |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 8MB | (1) 2M X | NONE | NONE | |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 8MB | (1) 1M x | NONE | (1) 1M x 36 | NONE |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 8MB | (4) 1M x 9 | NONE | (1) 1M x 36 | NONE |
|-------+------------+---------------+--------------+--------|
| 10MB | (1) 512K x | (1) 2M x 36 | | |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 12MB | (1) 1M x | NONE | (1) 2M x 36 | |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 12MB | (4) 1M x 9 | NONE | (1) 2M x 36 | |
|-------+------------+---------------+--------------+--------|
| 16MB | (4) 4M x 9 | NONE | NONE | NONE |
|-------+------------+---------------+--------------+--------|
| 16MB | (1) 2M x | (1) 2M x 36 | | |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 16MB | (1) 4M x | NONE | NONE | NONE |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 20MB | (4) 1M x 9 | NONE | (1) 4M x 36 | NONE |
|-------+------------+---------------+--------------+--------|
| 20MB | (1) 1M X | NONE | (1) 4M x 36 | NONE |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 32MB | (4) 4M x 9 | NONE | (1) 4M x 36 | NONE |
|-------+------------+---------------+--------------+--------|
| 32MB | (1) 4M x | NONE | (1) 4M x 36 | NONE |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 64MB | (4) 16M x | NONE | NONE | NONE |
| | 9 | | | |
|-------+------------+---------------+--------------+--------|
| 64MB | (1) 8M x | (1) 8M x 36 | | |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 64MB | (1) 16M x | NONE | NONE | NONE |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 128MB | (1) 16M x | NONE | (1) 16M x 36 | NONE |
| | 36 | | | |
|-------+------------+---------------+--------------+--------|
| 128MB | (4) 16M x | NONE | (1) 16M x 36 | NONE |
| | 9 | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 32K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP10 | JP11 | JP13 | JP50 |
|---------+----------+---------+-------------------+---------|
| 64KB | Open | Open | pins 2 & 3 closed | Open |
|---------+----------+---------+-------------------+---------|
| 128KB | Open | Closed | pins 1 & 2 closed | Open |
|---------+----------+---------+-------------------+---------|
| 256KB | Closed | Closed | pins 2 & 3 closed | Open |
|---------+----------+---------+-------------------+---------|
| 512KB | Closed | Closed | pins 1 & 2 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERNAL CACHE TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | Internal Cache Type | JP58 | JP59 |
|--------------+---------------------+-----------+-----------|
| P24T | Write-Through | Open | N/A |
|--------------+---------------------+-----------+-----------|
| P24T | Write-Back | Closed | N/A |
|--------------+---------------------+-----------+-----------|
| P24D | Write-Through | N/A | Open |
|--------------+---------------------+-----------+-----------|
| P24D | Write-Back | N/A | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP3 | JP5 | JP8 | JP42 | JP43 | JP44 |
|----------+--------+-------+-------+-------+-------+--------|
| 80486SX | Open | Open | pins | Open | pins | Open |
| | | | 2 & 3 | | 1 & 2 | |
|----------+--------+-------+-------+-------+-------+--------|
| AM486 | pins 1 | pins | pins | Open | pins | Open |
| | & 2 | 2 & 3 | 1 & 2 | | 1 & 2 | |
|----------+--------+-------+-------+-------+-------+--------|
| Cx486S | Open | Open | pins | pins | pins | Open |
| | | | 2 & 3 | 2 & 3 | 1 & 2 | |
|----------+--------+-------+-------+-------+-------+--------|
| 80487SX | pins 2 | pins | pins | Open | pins | Open |
| | & 3 | 2 & 3 | 1 & 2 | | 1 & 2 | |
|----------+--------+-------+-------+-------+-------+--------|
| Cx486S2 | Open | Open | pins | pins | pins | Open |
| | | | 2 & 3 | 2 & 3 | 2 & 3 | |
|----------+--------+-------+-------+-------+-------+--------|
| 80486DX | pins 1 | pins | pins | Open | pins | Open |
| | & 2 | 2 & 3 | 1 & 2 | | 1 & 2 | |
|----------+--------+-------+-------+-------+-------+--------|
| Cx486DX | pins 1 | pins | pins | pins | pins | Open |
| | & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 | |
|----------+--------+-------+-------+-------+-------+--------|
| Cx486DX2 | pins 1 | pins | pins | pins | pins | Open |
| | & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 | |
|----------+--------+-------+-------+-------+-------+--------|
| P24C | pins 1 | pins | pins | pins | pins | Closed |
| (DX4) | & 2 | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | |
|----------+--------+-------+-------+-------+-------+--------|
| P24T | pins 2 | pins | pins | Open | pins | Open |
| | & 3 | 2 & 3 | 1 & 2 | | 1 & 2 | |
|----------+--------+-------+-------+-------+-------+--------|
| P24D | pins 2 | pins | pins | Open | pins | Open |
| | & 3 | 2 & 3 | 1 & 2 | | 1 & 2 | |
|------------------------------------------------------------|
| Note:Pins designated are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Type | JP45 | JP46 | JP47 | JP48 | JP49 |
|------------+--------+--------+--------+--------+-----------|
| 80486SX | Open | Open | Open | Open | pins 1 & |
| | | | | | 2 |
|------------+--------+--------+--------+--------+-----------|
| AMD486 | Open | Open | Open | Open | pins 1 & |
| | | | | | 2 |
|------------+--------+--------+--------+--------+-----------|
| Cx486S | Open | Open | Closed | Closed | pins 1 & |
| | | | | | 2 |
|------------+--------+--------+--------+--------+-----------|
| 80487SX | Open | Open | Open | Open | pins 1 & |
| | | | | | 2 |
|------------+--------+--------+--------+--------+-----------|
| Cx486S2 | Open | Open | Closed | Closed | pins 2 & |
| | | | | | 3 |
|------------+--------+--------+--------+--------+-----------|
| 80486DX | Open | Open | Open | Open | pins 1 & |
| | | | | | 2 |
|------------+--------+--------+--------+--------+-----------|
| Cx486DX | Open | Open | Closed | Closed | pins 1 & |
| | | | | | 2 |
|------------+--------+--------+--------+--------+-----------|
| Cx486DX2 | Open | Open | Closed | Closed | pins 2 & |
| | | | | | 3 |
|------------+--------+--------+--------+--------+-----------|
| P24C (DX4) | Closed | Closed | Open | Open | pins 1 & |
| | | | | | 2 |
|------------+--------+--------+--------+--------+-----------|
| P24T | Open | Open | Open | Open | pins 1 & |
| | | | | | 2 |
|------------+--------+--------+--------+--------+-----------|
| P24D | Open | Open | Open | Open | pins 1 & |
| | | | | | 2 |
|------------------------------------------------------------|
| Note:Pins designated are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE (S-SERIES) CONFIGURATION |
|------------------------------------------------------------|
| Type | JP3 | JP5 | JP8 | JP42 | JP43 | JP44 |
|---------+--------+--------+-------+-------+-------+--------|
| 80486SX | Open | Open | pins | pins | pins | Closed |
| | | | 2 & 3 | 1 & 2 | 1 & 2 | |
|---------+--------+--------+-------+-------+-------+--------|
| 80486DX | pins 1 | pins 2 | pins | pins | pins | Closed |
| | & 2 | & 3 | 1 & 2 | 1 & 2 | 1 & 2 | |
|------------------------------------------------------------|
| Note:Pins designated are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE (S-SERIES) CONFIGURATION |
|------------------------------------------------------------|
| Type | JP45 | JP46 | JP47 | JP48 | JP49 |
|----------+----------+---------+-------+-------+------------|
| 80486SX | Closed | Closed | Open | Open | pins 1 & 2 |
|----------+----------+---------+-------+-------+------------|
| 80486DX | Closed | Closed | Open | Open | pins 1 & 2 |
|------------------------------------------------------------|
| Note:Pins designated are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED (ID3) CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP34 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE (ID2) CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP33 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SYSTEM CLOCK (NOT FOR P24C) CONFIGURATION |
|------------------------------------------------------------|
| Frequency | JP21 | JP22 | JP23 |
|-----------+----------------+---------------+---------------|
| 20MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 25MHz | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 33MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 40MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 50MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SYSTEM CLOCK (FOR P24C (DX4)) CONFIGURATION |
|------------------------------------------------------------|
| Frequency | JP21 | JP22 | JP23 |
|-----------+----------------+---------------+---------------|
| 25MHz | pins 2 & 3 | Open | pins 2 & 3 |
| | closed | | closed |
|-----------+----------------+---------------+---------------|
| 33MHz | Open | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
|-----------+----------------+---------------+---------------|
| 50MHz | Open | pins 2 & 3 | Open |
| | | closed | |
+------------------------------------------------------------+