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# GCH SYSTEMS, INC.
33MHz 80486 Baby AT (Rev. B)
Processor 80486DX
Processor Speed 33MHz
Chip Set ETEQ
Max. Onboard DRAM 32MB
Cache 64/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| External battery | JP1 | Reset switch | JP24 |
|---------------------+----------+----------------+----------|
| Power LED & keylock | JP22 | Turbo LED | JP25 |
|---------------------+----------+----------------+----------|
| Speaker | JP23 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-----------------------------------+--------+---------------|
| » | Monitor type select color | JP2 | Closed |
|---+-------------------------------+--------+---------------|
| | Monitor type select | JP2 | Open |
| | monochrome | | |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP3 | pins 1 & 2, 3 |
| | alter | | & 4 closed |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP4 | pins 1 & 2, 3 |
| | alter | | & 4 closed |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP5 | pins 2 & 3 |
| | alter | | closed |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP6 | Closed |
| | alter | | |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP7 | pins 1 & 2 |
| | alter | | closed |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP10 | pins 1 & 2 |
| | alter | | closed |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP11 | Closed |
| | alter | | |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP12 | Closed |
| | alter | | |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP13 | Closed |
| | alter | | |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP16 | Closed |
| | alter | | |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP18 | Closed |
| | alter | | |
|---+-------------------------------+--------+---------------|
| » | Factory configured - do not | JP19 | pins 1 & 2 |
| | alter | | closed |
|---+-------------------------------+--------+---------------|
| » | CPU speed select iOSC/2 | JP21 | Closed |
|---+-------------------------------+--------+---------------|
| | CPU speed select iOSC/1 | JP21 | Open |
|---+-------------------------------+--------+---------------|
| » | NPU disabled | JP20 | Open |
|---+-------------------------------+--------+---------------|
| | NPU enabled | JP20 | 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) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 64KB | (8) 8K x 8 | (2) 16K x 4 |
|------------------+--------------------+--------------------|
| 256KB | (8) 32K x 8 | (2) 16K x 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP14 | JP15 | JP17 |
|----------+---------+---------+---------+---------+---------|
| 64KB | 2 & 3 | 2 & 3 | Open | Open | Open |
|----------+---------+---------+---------+---------+---------|
| 256KB | 1 & 2 | 1 & 2 | Closed | Closed | Closed |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+