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# GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486IM
Processor CX486/AM486/UMC/80486SX/80486DX/80486DX2/80486DX4/P24D/ 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 32/64/128/256/512/1024KB
BIOS Award
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (2), 32-bit PCI slots (4), green PC
Options connector
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Reset switch | J2 | Turbo LED | JP24 |
|---------------+----------+----------------------+----------|
| Turbo switch | J3 | Green PC LED | JP27 |
|---------------+----------+----------------------+----------|
| Speaker | J4 | Green PC connector | JP28 |
|---------------+----------+----------------------+----------|
| Power LED & | J5 | 32-bit PCI slots | PC1 - |
| keylock | | | PC4 |
|---------------+----------+----------------------+----------|
| Green PC | JP12 | 32-bit VESA local | SL1 & |
| connector | | bus slots | SL2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | P24D cache type select write | JP6 | pins 2 & 3 |
| | through | | closed |
|---+----------------------------------+--------+------------|
| | P24D cache type select write | JP6 | pins 1 & 2 |
| | back | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP17 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP22 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 256K x 36 | (2) 512K 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) 256K x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (2) 512K x 36 | (2) 1M 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) 256K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 18MB | (2) 2M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 512K x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (2) 2M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 24MB | (2) 1M x 36 | (2) 2M 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) 256K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 34MB | (2) 4M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 512K x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 36MB | (2) 4M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 1M x 36 | (2) 4M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (2) 4M x 36 | (2) 1M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 2M x 36 | (2) 4M 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) 256K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 66MB | (2) 8M x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 512K x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 68MB | (2) 8M x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 1M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 72MB | (2) 8M x 36 | (2) 1M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 80MB | (2) 2M x 36 | (2) 8M x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 8M x 36 | (2) 2M x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 4M x 36 | (2) 8M 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 | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 64K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP19 | JP20 | JP21 | JP26 |
|---------+----------+---------+---------+-------------------|
| 128KB | Open | Open | Closed | pins 2 & 3 closed |
|---------+----------+---------+---------+-------------------|
| 256KB | Open | Closed | Closed | pins 1 & 2 closed |
|---------+----------+---------+---------+-------------------|
| 256KB | Open | Closed | Closed | pins 2 & 3 closed |
|---------+----------+---------+---------+-------------------|
| 512KB | Closed | Closed | Closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP3 | JP16 |
|------------------+--------------------+--------------------|
| Cyrix | pins 1 & 2 closed | N/A |
|------------------+--------------------+--------------------|
| AMD | pins 1 & 2 closed | N/A |
|------------------+--------------------+--------------------|
| UMC | pins 1 & 2 closed | N/A |
|------------------+--------------------+--------------------|
| 80486SX | N/A | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 80486DX | N/A | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| Intel | pins 1 & 2 closed | N/A |
|------------------+--------------------+--------------------|
| Intel S-series | pins 3 & 4 closed | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
|Type | RN1 | RN2 | RN3 | RN4 | RN5 |
|-----+----------+----------+----------+----------+----------|
|Cyrix|Installed | Not | Not |Installed | Not |
| | |installed |installed | |installed |
|-----+----------+----------+----------+----------+----------|
| AMD | Not | 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 | JP1 | JP13 |
|----------------+--------------------------+----------------|
| Cyrix | pins 1 & 2, 3 & 4 closed | Open |
|----------------+--------------------------+----------------|
| AMD | pins 5 & 6, 7 & 8 closed | Open |
|----------------+--------------------------+----------------|
| UMC | pins 5 & 6, 7 & 8 closed | Open |
|----------------+--------------------------+----------------|
| Intel | pins 3 & 4, 5 & 6 closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP2 |
|--------------------------+---------------------------------|
| 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 (80486DX4 ONLY) |
|------------------------------------------------------------|
| Speed | JP4 | JP23 |
|-------------------+-------------------+--------------------|
| 2x | Closed | pins 2 & 3 closed |
|-------------------+-------------------+--------------------|
| 3x | Open | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP25 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA DELAY CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP7 | JP15 |
|----------------------------------+------------+------------|
| Normal card installed | pins 1 & 2 | pins 1 & 2 |
| | closed | closed |
|----------------------------------+------------+------------|
| Card installed needs address | pins 2 & 3 | pins 2 & 3 |
| setup time | closed | closed |
+------------------------------------------------------------+