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# GENOA SYSTEMS CORPORATION
TURBOEXPRESS 486PCI-4G
Processor 80486SX/80486Overdrive/80487SX/80486DX/80486DX2
Processor 25/33/50(internal)/66(internal)MHz
Speed
Chip Set Unidentified
Video Chip Set None
Maximum 128MB
Onboard Memory
Maximum Video None
Memory
Cache 128/256/512KB
BIOS Award
Dimensions 254mm x 218mm
I/O Options 32-bit PCI slots (4)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | JP17 | Turbo LED | JP20 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | JP18 | Turbo switch | JP21 |
|-------------------+----------+------------------+----------|
| Reset switch | JP19 | 32-bit PCI slots | PC1 – |
| | | | PC4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (2) 512K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 1M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 36 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 18MB | (2) 2M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 2M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 1M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 36 | None |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 512K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 2M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | None |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 66MB | (2) 8M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 512K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
|------------------------------------------------------------|
| Note: Banks are interchangeable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 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 | JP2 | JP3 | JP12 | JP13 |
|-------+-----------------+----------------+--------+--------|
| 128KB | Pins 1 & 2 | Pins 2 & 3 | Open | Open |
| | closed | closed | | |
|-------+-----------------+----------------+--------+--------|
| 256KB | Pins 2 & 3 | Pins 1 & 2 | Closed | Open |
| | closed | closed | | |
|-------+-----------------+----------------+--------+--------|
| 512KB | Pins 2 & 3 | Pins 2 & 3 | Closed | Closed |
| | closed | closed | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP4 |
|----------------------------+-------------------------------|
| Enabled | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| Disabled | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP5 | JP10 | JP11 |
|-------------+-------------------+-------------+------------|
| 25MHz | Pins 1 & 2 closed | Open | Closed |
|-------------+-------------------+-------------+------------|
| 33MHz | Pins 2 & 3 closed | Closed | Open |
|-------------+-------------------+-------------+------------|
| 50iMHz | Pins 1 & 2 closed | Open | Closed |
|-------------+-------------------+-------------+------------|
| 66iMHz | Pins 2 & 3 closed | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP14 | JP15 | JP16 |
|--------------+------------+------------+-------------------|
| 80486SX | Pins 1 & 2 | Open | Pins 2 & 3 closed |
| | closed | | |
|--------------+------------+------------+-------------------|
| 486Overdrive | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2, 3 & 4 |
| (168 pin) | closed | closed | closed |
|--------------+------------+------------+-------------------|
| 486Overdrive | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2, 3 & 4 |
| (169 pin) | closed | closed | closed |
|--------------+------------+------------+-------------------|
| 80487SX | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2, 3 & 4 |
| | closed | closed | closed |
|--------------+------------+------------+-------------------|
| 80486DX | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2, 3 & 4 |
| | closed | closed | closed |
|--------------+------------+------------+-------------------|
| 8048DX2 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2, 3 & 4 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCI TRIGGER SELECTION |
|------------------------------------------------------------|
| Setting | JP27 | JP28 |
|----------------------+--------------------+----------------|
| » | ISA IDE | Pins 2 & 3 closed | Closed |
|---+------------------+--------------------+----------------|
| | Level | Pins 1 & 2 closed | Open |
|---+------------------+--------------------+----------------|
| | Edge | Pins 4 & 5 closed | Open |
+------------------------------------------------------------+