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# ROBOTECH, INC.
COBRA-RT VER. B/C/D/E
Processor CX486S/80486SX/CX487S/80487SX/80486DX/ODP486SX/80486DX2/
80486DX4/Pentium Overdrive
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set SIS
Max. 64MB
Onboard
DRAM
Cache 32/64/128/256KB
BIOS AMI
Dimensions 254mm x 220mm
I/O 32-bit VESA local bus slots (3), green PC connector
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Daughter board | BC20 | Reset switch | JP15D |
| interface | | | |
|-------------------+----------+------------------+----------|
| External battery | JP8 | Turbo switch | JP15E |
|-------------------+----------+------------------+----------|
| Speaker | JP15A | +5vDC ground | JP15F |
|-------------------+----------+------------------+----------|
| Power LED & | JP15B | Green PC | JP34 |
| keylock | | connector | |
|-------------------+----------+------------------+----------|
| Turbo LED | JP15C | 32-bit VESA | SL1 - |
| | | local bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal operation | JP3 | Open |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP3 | Closed |
|---+----------------------------------+--------+------------|
| » | Power good signal detect from | JP11 | pins 1 & 2 |
| | power supply | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | JP11 | pins 2 & 3 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| » | CPU type select 1 CPU on board | JP12 | pins 1 & 2 |
| | (PQFP or PGA) | | closed |
|---+----------------------------------+--------+------------|
| | CPU type select 2 CPU on board | JP12 | pins 2 & 3 |
| | (PGA enabled PQFP disabled) | | closed |
|---+----------------------------------+--------+------------|
| » | Green PC mode enabled | JP14 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Green PC mode disabled | JP14 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | VESA bus address type select | JP19 | pins 1 & 2 |
| | asynchronous (40/50mhz CPU) | | closed |
|---+----------------------------------+--------+------------|
| | VESA bus address type select | JP19 | pins 2 & 3 |
| | synchronous | | closed |
|---+----------------------------------+--------+------------|
| » | VESA bus data type select | JP20 | pins 1 & 2 |
| | synchronous | | closed |
|---+----------------------------------+--------+------------|
| | VESA bus data type select | JP20 | pins 2 & 3 |
| | aynchronous | | closed |
|---+----------------------------------+--------+------------|
| » | VGA card select normal | JP28 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | VGA card select Weitek Power | JP28 | pins 2 & 3 |
| | 9000 VGA only | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP36 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Mouse COM port select COM2 | JP39 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Mouse COM port select COM1 | JP39 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | 80486DX4 CPU speed select 3x | JP41 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | 80486DX4 CPU speed select 2x | JP41 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 32KB | (4) 8K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 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) 16K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP5 | JP6 | JP7 | JP9 | JP10 |
|----------+----------+---------+---------+---------+--------|
| 32KB | 2 & 3 | Open | Open | Open | Open |
|----------+----------+---------+---------+---------+--------|
| 64KB | 1 & 2 | Open | Open | Closed | Open |
|----------+----------+---------+---------+---------+--------|
| 128KB | 2 & 3 | 2 & 3 | Closed | Closed | Open |
|----------+----------+---------+---------+---------+--------|
| 256KB | 1 & 2 | 1 & 2 | Closed | Closed | 2 & 3 |
|----------+----------+---------+---------+---------+--------|
| 256KB | 1 & 2 | 1 & 2 | Closed | Closed | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP16 | JP17 |
|-------------------+-------------------+--------------------|
| CX486S | Open | pins 2 & 3 closed |
|-------------------+-------------------+--------------------|
| 80486SX | Open | pins 2 & 3 closed |
|-------------------+-------------------+--------------------|
| 80487SX | pins 2 & 3 closed | pins 1 & 2, 3 & 4 |
| | | closed |
|-------------------+-------------------+--------------------|
| ODP486SX | pins 2 & 3 closed | pins 1 & 2, 3 & 4 |
| | | closed |
|-------------------+-------------------+--------------------|
| 80486DX/DX2/DX4 | pins 1 & 2 closed | pins 1 & 2, 3 & 4 |
| | | closed |
|-------------------+-------------------+--------------------|
| Pentium Overdrive | pins 1 & 2 closed | pins 1 & 2, 3 & 4 |
| | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP21 | JP22 | JP23 | JP27 |
|------------+-----------+-----------+-----------+-----------|
| 25MHz | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 33MHz | Closed | Closed | Open | Open |
|------------+-----------+-----------+-----------+-----------|
| 40MHz | Open | Open | Closed | Closed |
|------------+-----------+-----------+-----------+-----------|
| 50iMHz | Closed | Open | Closed | Open |
|------------+-----------+-----------+-----------+-----------|
| 50MHz | Open | Closed | Open | Closed |
|------------+-----------+-----------+-----------+-----------|
| 66iMHz | Closed | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP42 | JP44 |
|-----------------+----------------------+-------------------|
| 3.3v (80486DX4) | Open | Open |
|-----------------+----------------------+-------------------|
| 5v | pins 3 & 5, 4 & 6 | pins 1 & 2, 3 & 4 |
| | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA BUS CLOCK CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP25 | JP26 | JP29 |
|--------------+-------------------+------------+------------|
| Synchronous | pins 1 & 2 closed | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|--------------+-------------------+------------+------------|
| Asynchronous | pins 2 & 3 closed | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
|------------------------------------------------------------|
| Note: these settings are valid for SL1, SL2 & SL3. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CIRRUS LOGIC VIDEO CARD CONFIGURATION (VER. AB) |
|------------------------------------------------------------|
| CPU speed | JP19 | JP20 |
|------------------+--------------------+--------------------|
| 25MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 33MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 40MHz | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 50iMHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 50MHz | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 66iMHz | pins 2 & 3 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CIRRUS LOGIC VIDEO CARD CONFIGURATION (VER. AC) |
|------------------------------------------------------------|
| CPU speed | JP19 | JP20 |
|------------------+--------------------+--------------------|
| 25MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 33MHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 40MHz | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 50iMHz | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 50MHz | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 66iMHz | pins 2 & 3 closed | pins 1 & 2 closed |
+------------------------------------------------------------+