(TXT) View Source
# FIRST INTERNATIONAL COMPUTER, INC.
LEO 486-PSD-10
Processor 80486SX/80486DX/80486DX2/80486DX4/Pentium Overdrive
Processor 25/33/40/50(internal)/66(internal)/100(internal)MHz
Speed
Chip Set INTEL
Max. 128MB
Onboard
DRAM
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Floppy drive interface, IDE interface,mouse
Options connector, parallel port,
P/S2 mouse connector, serial ports (2), VGA
connector
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| Bus mouse | CN1 | IDE LED | J11 |
| connector | | | |
|-----------------+----------+--------------------+----------|
| P/S2 mouse | CN4 | Green power supply | J16 |
| connector | | connector | |
|-----------------+----------+--------------------+----------|
| Floppy drive | CN6 | Turbo switch | J29 |
| interface | | | |
|-----------------+----------+--------------------+----------|
| IDE connector | CN7 | Turbo LED | J30 |
|-----------------+----------+--------------------+----------|
| Serial port 1 | CN8 | Reset switch | J31 |
|-----------------+----------+--------------------+----------|
| Serial port 2 | CN9 | Speaker | J32 |
|-----------------+----------+--------------------+----------|
| Parallel port | CN10 | Power LED & | J33 |
| | | keylock | |
|-----------------+----------+--------------------+----------|
| SCSI connector | CN11 | PCI slots | PCI 1, |
| | | | 2, & 3 |
|-----------------+----------+--------------------+----------|
| SCSI busy LED | J7 | 3.3V daughter | PS3V |
| | | board (80486DX4) | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CPU generate parity | J4 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | DPU generate parity | J4 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Do not force parity error | J5 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Force parity error | J5 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | SCSI enable | J6 | closed |
|---+----------------------------------+--------+------------|
| | SCSI disable | J6 | open |
|---+----------------------------------+--------+------------|
| » | SCSI power source from | J8 | open |
| | peripheral device | | |
|---+----------------------------------+--------+------------|
| | SCSI power source from system | J8 | closed |
|---+----------------------------------+--------+------------|
| | IDE connector pin 27 linked to | J9 | closed |
| | IOCHRDY signal | | |
|---+----------------------------------+--------+------------|
| | IDE connector pin 27 open | J9 | open |
|---+----------------------------------+--------+------------|
| | IDE connector pin 28 linked to | J10 | closed |
| | BALE signal | | |
|---+----------------------------------+--------+------------|
| | IDE connector pin 28 open | J10 | open |
|---+----------------------------------+--------+------------|
| » | Normal operation | J17 | Open |
|---+----------------------------------+--------+------------|
| | Clear password | J17 | closed |
|---+----------------------------------+--------+------------|
| » | Saturn B-step chip | J23 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Saturn II/II-50 | J23 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Cache set at 256K | J24 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Cache set at 64K | J24 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Level 2 write-back cache | J25 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Level 2 write-through cache | J25 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | 80486DX4 2.5X mode | J26 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | 80486DX4 2X mode | J26 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | 80486DX4 3X mode | J26 | open |
|---+----------------------------------+--------+------------|
| » | Pentium Overdrive internal | J27 | pins 1 & 2 |
| | write-back cache | | closed |
|---+----------------------------------+--------+------------|
| | Pentium Overdrive internal | J27 | pins 2 & 3 |
| | write-through cache | | closed |
|---+----------------------------------+--------+------------|
| » | No cache wait state | JF3 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | One cache wait state | JF3 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Saturn II/II-50 chipset with | JF9 | pins 2 & 3 |
| | SL-enhan/DX4/Pentium overdrive | | closed |
|---+----------------------------------+--------+------------|
| | Saturn II/II-50 chipset with | JF9 | pins 1 & 2 |
| | other CPUs | | closed |
|---+----------------------------------+--------+------------|
| | Saturn II/II-50 chipset for | JF9 | open |
| | Saturn B-step chipset use | | |
|---+----------------------------------+--------+------------|
| » | PCI SCSI IRQ at IRQ9 | JN1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | PCI SCSI IRQ at IRQ11 | JN1 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 34MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | (1) 256K x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 16M x | (1) 16M x | NONE | NONE |
| | 36 | 36 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CONTINUED) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-----------+-----------+---------------+------------|
| 66MB | (1) 16M x | (1) 16M x | (1) 256K x 36 | (1) 256K x |
| | 36 | 36 | | 36 |
|-------+-----------+-----------+---------------+------------|
| 72MB | (1) 16M x | (1) 16M x | (1) 1M x 36 | (1) 1M x |
| | 36 | 36 | | 36 |
|-------+-----------+-----------+---------------+------------|
| 96MB | (1) 16M x | (1) 16M x | (1) 16M x 36 | (1) 16M x |
| | 36 | 36 | | 36 |
|-------+-----------+-----------+---------------+------------|
| 128MB | (1) 16M x | (1) 16M x | (1) 16M x 36 | (1) 16M x |
| | 36 | 36 | | 36 |
|------------------------------------------------------------|
| Note:A {(1) 32M x 36} is a double RAS SIMM. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Data RAM | TAG RAM | U32 (dirty bit) |
|----------+---------------+---------------+-----------------|
| 64KB | (8) 8K x 8 | (1) 1K x 8 | 64K x 1 |
|----------+---------------+---------------+-----------------|
| 256KB | (8) 32K x 8 | (1) 32K x 8 | 64K x 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J14 | J15 | J18 | J19 |
|---------+------------+------------+------------+-----------|
| 64KB | Open | Open | Open | Open |
|---------+------------+------------+------------+-----------|
| 256KB | Closed | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE INTERLEAVE CONFIGURATION |
|------------------------------------------------------------|
| Type | J20 | J21 | J22 |
|-------------+------------------+-------------+-------------|
| Interleave | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------------+------------------+-------------+-------------|
| Standard | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|------------------------------------------------------------|
| Note:Interleave setting is for the Saturn II-50 chipset |
| only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JC1 | JC2, JC3 |
|--------------------+------------------+--------------------|
| 80486SX | Open | pins 2 & 3 |
|--------------------+------------------+--------------------|
| 80486DX | Open | pins 1 & 2 |
|--------------------+------------------+--------------------|
| 80486DX2 | Open | pins 1 & 2 |
|--------------------+------------------+--------------------|
| 80486DX4 | Open | pins 1 & 2 |
|--------------------+------------------+--------------------|
| Pentium Overdrive | Closed | pins 1 & 2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CONTINUED) |
|------------------------------------------------------------|
| Type | JC4, J12 | JC5 | JC6 |
|---------------+---------------+------------+---------------|
| 80486SX 1 | Closed | Open | pins 1 & 2 |
|---------------+---------------+------------+---------------|
| 80486SX 2 | Closed | Open | pins 1 & 2 |
|---------------+---------------+------------+---------------|
| 80486DX 1 | Closed | Open | pins 1 & 2 |
|---------------+---------------+------------+---------------|
| 80486DX 2 | Closed | Open | pins 1 & 2 |
|---------------+---------------+------------+---------------|
| 80486DX2 1 | Closed | Open | pins 1 & 2 |
|---------------+---------------+------------+---------------|
| 80486DX2 2 | Closed | Open | pins 1 & 2 |
|---------------+---------------+------------+---------------|
| 80486DX4 1 | Closed | Open | pins 1 & 2 |
|---------------+---------------+------------+---------------|
| 80486DX4 2 | Closed | Closed | pins 2 & 3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CONTINUED) |
|------------------------------------------------------------|
| Type | JC4, J12 | JC5 | JC6 |
|---------------------+------------+----------+--------------|
| SL enhanced 1 | Closed | open | pins 1 & 2 |
|---------------------+------------+----------+--------------|
| SL enhanced 2 | Closed | closed | pins 2 & 3 |
|---------------------+------------+----------+--------------|
| Pentium Overdrive 1 | Open | open | pins 1 & 2 |
|---------------------+------------+----------+--------------|
| Pentium Overdrive 2 | Open | closed | pins 2 & 3 |
|------------------------------------------------------------|
| Note: 1 denotes Saturn B-step chipset used with CPU. |
|------------------------------------------------------------|
| 2 denotes Saturn II/II-50 chipset used with CPU. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK (VT8225N) CONFIGURATION |
|------------------------------------------------------------|
| Speed | JK1 | JK2 |
|------------------+--------------------+--------------------|
| CLK2 50 Mhz | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| CLK2 66.6 Mhz | pins 2 & 3 closed | pins 1 & 2 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JF6 | JF7 |
|-------------------+--------------------+-------------------|
| Reserved | pins 2 & 3 | pins 1 & 2 |
|-------------------+--------------------+-------------------|
| 25MHz | pins 1 & 2 | pins 1 & 2 |
|-------------------+--------------------+-------------------|
| 33Mhz | pins 1 & 2 | pins 2 & 3 |
|-------------------+--------------------+-------------------|
| 50iMHz | pins 1 & 2 | pins 1 & 2 |
|-------------------+--------------------+-------------------|
| 50iMHz 1 | pins 2 & 3 | pins 2 & 3 |
|-------------------+--------------------+-------------------|
| 66iMHz | pins 1 & 2 | pins 2 & 3 |
|------------------------------------------------------------|
| Note: 1 denotes Saturn II-50 chipset only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI1 IRQ SELECTION |
|------------------------------------------------------------|
| Jumper | IRQ | Setting |
|--------------------+------------------+--------------------|
| JI1 | IRQ5 | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| JI2 | IRQ9 | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| JI3 | IRQ10 | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| JI4 | IRQ11 | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| JI5 | IRQ12 | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| JI6 | IRQ14 | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| JI7 | IRQ15 | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI2 & PCI3 IRQ SELECTION |
|------------------------------------------------------------|
| Jumper | IRQ | Setting |
|--------------------+------------------+--------------------|
| JI1 | IRQ5 | pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| JI2 | IRQ9 | pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| JI3 | IRQ10 | pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| JI4 | IRQ11 | pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| JI5 | IRQ12 | pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| JI6 | IRQ14 | pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| JI7 | IRQ15 | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TAG ADDRESS CONFIGURATION |
|------------------------------------------------------------|
| Address | JF1 | JF2 |
|------------------+--------------------+--------------------|
| 8-bit | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 7-bit | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 9-bit | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| Reserved | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note:1. When using the PCI1 slot on the mainboard, jumper |
| choice should only be limited to pins 1 & 2 of jumpers |
| JI1 to JI7 |
|------------------------------------------------------------|
| 2. When using PCI2 or PCI3 slots on the mainboard, jumper |
| choice should only be limited to pins |
|------------------------------------------------------------|
| 2 & 3 of jumpers JI1 to JI7. |
|------------------------------------------------------------|
| 3. When using the Saturn B-step chipset, PCI1 slot serves |
| as the master slot while PCI2 and PCI |
|------------------------------------------------------------|
| 3 slots serve as slave slots. |
|------------------------------------------------------------|
| 4. When using the Saturn II/II-50 chipset, PCI1, PCI2, |
| PCI3 slots can serve both as master or |
|------------------------------------------------------------|
| slave slot. |
+------------------------------------------------------------+