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# ABIT COMPUTER CORPORATION
CACHE 386/486 SYSTEM DOMINATOR AK3/4
Processor AM386DX/80386DX/CX486DLC
Processor Speed 33/40MHz
Chip Set UMC
Max. Onboard DRAM 32MB
Cache 32/128KB
BIOS Award
Dimensions 170mm x 220mm
NPU Options Intel 80387D/CX87DLC/IIT3C87-33-40
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| Keyboard Connector | J1 | Turbo switch | J5 |
|--------------------+----------+-----------------+----------|
| External battery | J2 | Turbo LED | J6 |
|--------------------+----------+-----------------+----------|
| Power Input | J3 | Speaker | J7 |
|--------------------+----------+-----------------+----------|
| Reset switch | J4 | Power LED & | J8 |
| | | keylock | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | NPU disabled | JP1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | NPU enabled | JP1 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | CPU speed select 40 MHz | JP7 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU speed select 33 MHz | JP7 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP8 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Power good signal detect from | JP9 | pins 2 & 3 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | JP9 | pins 1 & 2 |
| | power supply | | 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 | Max Cachable | Bank 0 | TAG |
|-------------+---------------+---------------+--------------|
| 32KB | 8MB | (4) 8K x 8 | 8K x 8 |
|-------------+---------------+---------------+--------------|
| 128KB | 16MB | (4) 32K x 8 | 8K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP3 | JP4 | JP5 |
|--------------+---------------+--------------+--------------|
| 32KB | Open | Open | Open |
|--------------+---------------+--------------+--------------|
| 128KB | Closed | Closed | Closed |
+------------------------------------------------------------+