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# GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486AM/AMS (REV. 2.20)
Processor CX486/AM486/UMC/SL80486SX/80486SX/SL80486DX/80486DX/
SL80486DX2/80486DX2/P24D/AM486DX4/80486DX4/Pentium Overdrive
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set UMC
Max. 128MB
Onboard
DRAM
Cache 128/256/512/1024KB
BIOS Award
Dimensions 250mm x 220mm
I/O 32-bit PCI slots (3), floppy drive interface, green PC connector,
Options IDE interfaces (2), parallel port, serial ports (2)
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| IDE interface 1 | CN1 | Speaker | J3 |
|-------------------+----------+------------------+----------|
| IDE interface 2 | CN2 | Power LED & | J4 |
| | | keylock | |
|-------------------+----------+------------------+----------|
| Floppy drive | CN3 | IDE interface | JP1 |
| interface | | LED | |
|-------------------+----------+------------------+----------|
| Parallel port | CN4 | Turbo LED | JP2 |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN5 | Green PC | JP3 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN6 | Green PC LED | JP4 |
|-------------------+----------+------------------+----------|
| Reset switch | J1 | Green PC | JP25 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Turbo switch | J2 | 32-bit PCI slots | PC1 - |
| | | | PC3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JP14 | Pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP18 | Pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP19 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Cache type select write through | JP20 | Closed |
|---+----------------------------------+--------+------------|
| | Cache type select write back | JP20 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 1M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 2M x 36 | NONE |
|------------------+--------------------+--------------------|
| 18MB | (2) 2M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 2M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 2M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 2M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 4M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 4M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 4M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8M x 36 | NONE |
|------------------+--------------------+--------------------|
| 66MB | (2) 8M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 8M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8M x 36 | (2) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-------------+---------------+---------------+--------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|-------------+---------------+---------------+--------------|
| 256KB (A) | (4) 32K x 8 | (4) 32K x 8 | (1) 16K x 8 |
|-------------+---------------+---------------+--------------|
| 256KB (B) | (4) 64K x 8 | NONE | (1) 16K x 8 |
|-------------+---------------+---------------+--------------|
| 512KB (A) | (4) 64K x 8 | (4) 64K x 8 | (1) 32K x 8 |
|-------------+---------------+---------------+--------------|
| 512KB (B) | (4) 128K x 8 | NONE | (1) 32K x 8 |
|-------------+---------------+---------------+--------------|
| 1MB | (4) 128K x 8 | (4) 128K x 8 | (1) 64K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP24 | JP26 |
|-----------+----------------------------+-------------------|
| 128KB | Open | Pins 3 & 5 closed |
|-----------+----------------------------+-------------------|
| 256KB (A) | Pins 1 & 2 closed | Pins 1 & 3 closed |
|-----------+----------------------------+-------------------|
| 256KB (B) | Pins 1 & 2 closed | Pins 3 & 5 closed |
|-----------+----------------------------+-------------------|
| 512KB (A) | Pins 1 & 2, 3 & 4 closed | Pins 2 & 4 closed |
|-----------+----------------------------+-------------------|
| 512KB (B) | Pins 1 & 2, 3 & 4 closed | Pins 3 & 5 closed |
|-----------+----------------------------+-------------------|
| 1MB | Pins 1 & 2, 3 & 4, 5 & 6 | Pins 4 & 6 closed |
| | closed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
|Type | RN1 | RN2 | RN3 | RN4 | RN5 |
|-----+----------+----------+----------+----------+----------|
|Cyrix|Installed | Not | Not |Installed | Not |
| | |installed |installed | |installed |
|-----+----------+----------+----------+----------+----------|
| AMD | Not |Installed | Not | Not |Installed |
| |installed | |installed |installed | |
|-----+----------+----------+----------+----------+----------|
| UMC | Not | Not |Installed | Not | Not |
| |installed |installed | |installed |installed |
|-----+----------+----------+----------+----------+----------|
|Intel| Not |Installed | Not | Not |Installed |
| |installed | |installed |installed | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP8 |
|----------------------------+-------------------------------|
| All CPU types | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| Intel S-series | Pins 3 & 4 closed |
|----------------------------+-------------------------------|
| AMD S-series | Pins 3 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP9 |
|-------------------------------+----------------------------|
| All CPU types | Closed |
|-------------------------------+----------------------------|
| AMD | Open |
|-------------------------------+----------------------------|
| UMC | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP11 |
|----------------------------+-------------------------------|
| 80486SX | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 80486DX | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP13 |
|-------------------------------+----------------------------|
| All CPU types | Closed |
|-------------------------------+----------------------------|
| 80486DX4 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP5 |
|----------------------------+-------------------------------|
| Cyrix | Pins 1 & 2, 3 & 4 closed |
|----------------------------+-------------------------------|
| AMD | Pins 3 & 4, 5 & 6 closed |
|----------------------------+-------------------------------|
| UMC | Pins 5 & 6, 7 & 8 closed |
|----------------------------+-------------------------------|
| Intel | Pins 3 & 4, 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP15 |
|--------------------------+---------------------------------|
| 25MHz | Pins 1 & 2 closed |
|--------------------------+---------------------------------|
| 33MHz | Pins 1 & 2, 3 & 4, 5 & 6 closed |
|--------------------------+---------------------------------|
| 40MHz | Pins 1 & 2, 3 & 4 closed |
|--------------------------+---------------------------------|
| 50iMHz | Pins 1 & 2 closed |
|--------------------------+---------------------------------|
| 50MHz | Pins 5 & 6 closed |
|--------------------------+---------------------------------|
| 66iMHz | Pins 1 & 2, 3 & 4, 5 & 6 closed |
|--------------------------+---------------------------------|
| 75iMHz | Pins 1 & 2 closed |
|--------------------------+---------------------------------|
| 100iMHz | Pins 1 & 2, 3 & 4, 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (P24D & AM486DX4 ONLY) |
|------------------------------------------------------------|
| Speed | JP12 |
|----------------------------+-------------------------------|
| 2x | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3x | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486DX4 ONLY) |
|------------------------------------------------------------|
| Speed | JP10 |
|------------------------------+-----------------------------|
| 2x | Closed |
|------------------------------+-----------------------------|
| 3x | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP21 | JP22 |
|--------------------+-------------------+-------------------|
| 3.3v | Open | Open |
|--------------------+-------------------+-------------------|
| 4v | Open | Closed |
|--------------------+-------------------+-------------------|
| 5v | Closed | Open |
+------------------------------------------------------------+