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# AMERICAN MEGATRENDS, INC.
486 GEMINI
Processor 80486DX
Processor Speed 25/33MHz
Chip Set C & T
Max. Onboard DRAM 20MB
Cache 64KB
BIOS AMI
Dimensions 355.6mm x 304mm
I/O Options 32-bit external memory card slot
NPU Options 3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Turbo LED | J1 | Power LED & keylock | J8 |
|--------------+----------+-----------------------+----------|
| Reset switch | J2 | External battery | J9 |
|--------------+----------+-----------------------+----------|
| Speaker | J7 | 32-bit external | S1 |
| | | memory card | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS ||
|-----------------------------------------------------------||
| Function | Switch | Position ||
|------------------------------------+----------+-----------||
| » | Factory configured - do not | SW1/1 | Off ||
| | alter | | ||
|---+--------------------------------+----------+-----------||
| » | Monitor type select monochrome | SW1/2 | Off ||
|---+--------------------------------+----------+-----------||
| | Monitor type select color | SW1/2 | On ||
|---+--------------------------------------------------------|
| | Note : Cache is factory installed and is not |
| | configurable. The size and location of cache and tag |
| | are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|--------------+---------------------+-----------------------|
| 1MB | (36) 41256 | NONE |
|--------------+---------------------+-----------------------|
| 1MB | NONE | (4) 256K x 9 |
|--------------+---------------------+-----------------------|
| 2MB | (36) 41256 | (4) 256K x 9 |
|--------------+---------------------+-----------------------|
| 4MB | (36) 411000 | NONE |
|--------------+---------------------+-----------------------|
| 4MB | NONE | (4) 1M x 9 |
|--------------+---------------------+-----------------------|
| 5MB | (36) 41256 | (4) 1M x 9 |
|--------------+---------------------+-----------------------|
| 5MB | (36) 411000 | (4) 256K x 9 |
|--------------+---------------------+-----------------------|
| 8MB | (36) 411000 | (4) 1M x 9 |
|--------------+---------------------+-----------------------|
| 16MB | NONE | (4) 4M x 9 |
|--------------+---------------------+-----------------------|
| 17MB | (36) 41256 | (4) 4M x 9 |
|--------------+---------------------+-----------------------|
| 20MB | (36) 411000 | (4) 4M x 9 |
|------------------------------------------------------------|
| Note : There were two versions of this board made, one |
| that had 1MB of DIPP DRAM installed and one that had 4MB |
| of DIPP DRAM installed. The 1MB version could be upgraded |
| by the factory to support 4MB of DIPP DRAM. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J26 | J27 |
|---------+--------------------+-----------------------------|
| 1MB | Open | pins 1 & 2 and 3 & 4 closed |
|---------+--------------------+-----------------------------|
| 1MB | Open | pins 2 & 3 and 4 & 5 closed |
|---------+--------------------+-----------------------------|
| 2MB | Open | pins 1 & 2 and 3 & 4 closed |
|---------+--------------------+-----------------------------|
| 4MB | Open | pins 1 & 2 and 3 & 4 closed |
|---------+--------------------+-----------------------------|
| 4MB | Open | pins 2 & 3 and 4 & 5 closed |
|---------+--------------------+-----------------------------|
| 5MB | Open | pins 1 & 2 and 3 & 4 closed |
|---------+--------------------+-----------------------------|
| 5MB | Open | pins 2 & 3 and 4 & 5 closed |
|---------+--------------------+-----------------------------|
| 8MB | Open | pins 2 & 3 and 4 & 5 closed |
|---------+--------------------+-----------------------------|
| 16MB | pins 1 & 2 closed | pins 2 & 3 and 4 & 5 closed |
|---------+--------------------+-----------------------------|
| 17MB | pins 1 & 2 closed | pins 1 & 2 and 3 & 4 closed |
|---------+--------------------+-----------------------------|
| 20MB | pins 1 & 2 closed | pins 1 & 2 and 3 & 4 closed |
+------------------------------------------------------------+