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# VEXTREC TECHNOLOGY, INC.
GMB-486APS (VER. 1.00)
Device Type Mainboard
Processor 80486SX/DX/DX2/DX4/P24/AM486DX2/DX4/ AM
5X86/AM K5/AM K6/CX486DX/DX2/DX4/CX 5X86/CX
6X86/CX 6X86L/TI 486DX2/SGS ST486SX
Processor Speed 25/33/40/50/60/66/75/90/100/120/133
Chip Set ALI
Maximum Onboard 128MB (EDO & SDRAM supported)
Memory
Cache 128/256/512KB
BIOS Award
Dimensions 220mm x 220mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
IDE interfaces (2), parallel port, serial
ports (2), IR connector, Green PC connector
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| IDE interface 1 | CN1 | Reset switch | J2 |
|-------------------+----------+------------------+----------|
| IDE interface 2 | CN2 | Turbo switch | J3 |
|-------------------+----------+------------------+----------|
| Parallel port | CN3 | Turbo LED | J4 |
|-------------------+----------+------------------+----------|
| Floppy drive | CN4 | Power LED & | J5 |
| interface | | keylock | |
|-------------------+----------+------------------+----------|
| IR connector | CN5 | Speaker | J6 |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN6 | IDE interface | J7 |
| | | LED | |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN7 | Green PC | JP21 |
| | | connector | |
|-------------------+----------+------------------+----------|
| External battery | J1 | 32-bit PCI slots | PC1 - |
| | | | PC4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-----------------------------------+-------+----------------|
| » | CMOS memory normal operation | J1 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | CMOS memory clear | J1 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | Flash BIOS voltage select 5V | JP9 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | Flash BIOS voltage select 12V | JP9 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 2MB | (2) 256K x 36 | None |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 4MB | (2) 512K x 36 | None |
|------------------+--------------------+--------------------|
| 8MB | (2) 512K x 36 | (2) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1MB x 36 | None |
|------------------+--------------------+--------------------|
| 16MB | (2) 1MB x 36 | (2) 1MB x 36 |
|------------------+--------------------+--------------------|
| 16MB | (2) 2MB x 36 | None |
|------------------+--------------------+--------------------|
| 24MB | (2) 2MB x 36 | (2) 1MB x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 2MB x 36 | (2) 2MB x 36 |
|------------------+--------------------+--------------------|
| 32MB | (2) 4MB x 36 | None |
|------------------+--------------------+--------------------|
| 40MB | (2) 4MB x 36 | (2) 1MB x 36 |
|------------------+--------------------+--------------------|
| 48MB | (2) 4MB x 36 | (2) 2MB x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 4MB x 36 | (2) 4MB x 36 |
|------------------+--------------------+--------------------|
| 64MB | (2) 8MB x 36 | None |
|------------------+--------------------+--------------------|
| 72MB | (2) 8MB x 36 | (2) 1MB x 36 |
|------------------+--------------------+--------------------|
| 80MB | (2) 8MB x 36 | (2) 2MB x 36 |
|------------------+--------------------+--------------------|
| 96MB | (2) 8MB x 36 | (2) 4MB x 36 |
|------------------+--------------------+--------------------|
| 128MB | (2) 8MB x 36 | (2) 8MB x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 128KB | 32K x 8 | 8K x 8 |
|------------------+--------------------+--------------------|
| 256KB | 64K x 8 | 16K x 8 |
|------------------+--------------------+--------------------|
| 512KB | 128K x 8 | 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP15 | JP30 |
|------------+--------------------------+--------------------|
| 128KB | Open | Pins 2 & 3 closed |
|------------+--------------------------+--------------------|
| 256KB | Pins 2 & 3 closed | Pins 1 & 2 closed |
|------------+--------------------------+--------------------|
| 512KB | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP2 | JP5 | JP6 | JP7 | JP8 |
|----------+---------+---------+---------+---------+---------|
| 25MHz | 1 & 2 | Open | Open | 1 & 2 | Open |
|----------+---------+---------+---------+---------+---------|
| 33MHz | 1 & 2 | Closed | Closed | 1 & 2 | Open |
|----------+---------+---------+---------+---------+---------|
| 40MHz | 2 & 3 | Closed | Open | 2 & 3 | Closed |
|------------------------------------------------------------|
| Note: Pins designated are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (INTEL) |
|------------------------------------------------------------|
| CPU type | JP19 | JP20 | JP22 | JP23 | JP24 |
|---------------------+-------+------+-------+-------+-------|
| 80486DX2/DX4 (P24C) | 2 & 3 | Open | Open | 1 & 2 | 1 & 2 |
|---------------------+-------+------+-------+-------+-------|
| 80486DX2 (P24D) | 2 & 3 | Open | 5 & 6 | 2 & 3 | 1 & 2 |
| (L1WB) | | | | | |
|---------------------+-------+------+-------+-------+-------|
| 80486DX/DX2 | 2 & 3 | Open | Open | 1 & 2 | Open |
|---------------------+-------+------+-------+-------+-------|
| 80487SX | 1 & 2 | Open | Open | 1 & 2 | Open |
|---------------------+-------+------+-------+-------+-------|
| 80486SX/SX2 | Open | Open | Open | 1 & 2 | 1 & 2 |
|---------------------+-------+------+-------+-------+-------|
| 80486SX | Open | Open | Open | 1 & 2 | Open |
|---------------------+-------+------+-------+-------+-------|
| P24T | 1 & 2 | Open | Open | 2 & 3 | 1 & 2 |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (INTEL) (CON’T) |
|------------------------------------------------------------|
| Type | JP25 | JP26 | JP27 | JP28 | JP29 |
|-------------------+--------+-------+-------+-------+-------|
| 80486DX2/DX4 | Closed | 3 & 4 | 1 & 2 | 2 & 3 | Open |
| (P24C) | | | | | |
|-------------------+--------+-------+-------+-------+-------|
| 80486DX2 (P24D) | Closed | 3 & 4 | 1 & 2 | 2 & 3 | 3 & 4 |
| (L1WB) | | | | | |
|-------------------+--------+-------+-------+-------+-------|
| 80486DX/DX2 | Open | 1 & 2 | Open | 2 & 3 | Open |
|-------------------+--------+-------+-------+-------+-------|
| 80487SX | Open | 1 & 2 | Open | 2 & 3 | Open |
|-------------------+--------+-------+-------+-------+-------|
| 80486SX/SX2 | Closed | 3 & 4 | 1 & 2 | 1 & 2 | Open |
|-------------------+--------+-------+-------+-------+-------|
| 80486SX | Open | 1 & 2 | Open | 1 & 2 | Open |
|-------------------+--------+-------+-------+-------+-------|
| P24T | Closed | 3 & 4 | 1 & 2 | 2 & 3 | Open |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CYRIX) |
|------------------------------------------------------------|
| Type | JP19 | JP20 | JP22 | JP23 | JP24 |
|---------------------+-------+------+-------+-------+-------|
| 486DX4-GP4 | 2 & 3 | Open | Open | 1 & 2 | 1 & 2 |
|---------------------+-------+------+-------+-------+-------|
| DX/DX2/DX2-V/DX4-GP | 2 & 3 | Open | 1 & 2 | 1 & 2 | 3 & 4 |
|---------------------+-------+------+-------+-------+-------|
| CX 5X86 | 2 & 3 | Open | 5 & 6 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CYRIX) (CON’T) |
|------------------------------------------------------------|
| Type | JP25 | JP26 | JP27 | JP28 | JP29 |
|---------------------+--------+-------+-------+------+------|
| 486DX4-GP4 | Closed | 3 & 4 | 1 & 2 | 2 & | Open |
| | | | | 3 | |
|---------------------+--------+-------+-------+------+------|
| DX/DX2/DX2-V/DX4-GP | Closed | 5 & 6 | 3 & 4 | 2 & | 1 & |
| | | | | 3 | 2 |
|---------------------+--------+-------+-------+------+------|
| CX 5X86 | Closed | 3 & 4 | 1 & 2 | 2 & | 3 & |
| | | | | 3 | 4 |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (AMD) |
|------------------------------------------------------------|
| Type | JP19 | JP20 | JP22 | JP23 | JP24 |
|---------------------+-------+------+-------+-------+-------|
| Am486DX2/DX4 | 2 & 3 | Open | Open | 1 & 2 | 1 & 2 |
|---------------------+-------+------+-------+-------+-------|
| Am486DX2/DX4 (SV8B) | 2 & 3 | Open | 5 & 6 | 2 & 3 | 1 & 2 |
|---------------------+-------+------+-------+-------+-------|
| AMD-5X86 (AMD-5X) | 2 & 3 | Open | 5 & 6 | 2 & 3 | 1 & 2 |
|---------------------+-------+------+-------+-------+-------|
| Am486DX/DX2 | 2 & 3 | Open | Open | 1 & 2 | Open |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (AMD) (CON’T) |
|------------------------------------------------------------|
| Type | JP25 | JP26 | JP27 | JP28 | JP29 |
|-------------------+--------+-------+-------+-------+-------|
| Am486DX2/DX4 | Closed | 3 & 4 | 1 & 2 | 2 & 3 | Open |
|-------------------+--------+-------+-------+-------+-------|
| Am486DX2/DX4 | Closed | 3 & 4 | 1 & 2 | 2 & 3 | 3 & 4 |
| (SV8B) | | | | | |
|-------------------+--------+-------+-------+-------+-------|
| AMD-5X86 (AMD-5X) | Closed | 3 & 4 | 1 & 2 | 2 & 3 | 3 & 4 |
|-------------------+--------+-------+-------+-------+-------|
| Am486DX/DX2 | Open | 1 & 2 | Open | 2 & 3 | Open |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (SGS/THOMSON) |
|------------------------------------------------------------|
| Type | JP19 | JP20 | JP22 | JP23 | JP24 |
|-----------------+--------+-------+-------+--------+--------|
| ST486DX4V10HS | 2 & 3 | Open | Open | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (SGS/THOMSON) (CON’T) |
|------------------------------------------------------------|
| Type | JP25 | JP26 | JP27 | JP28 | JP29 |
|----------------+---------+--------+--------+--------+------|
| ST486DX4V10HS | Closed | 3 & 4 | 1 & 2 | 2 & 3 | Open |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (TEXAS INSTUMENTS) |
|------------------------------------------------------------|
| Type | JP19 | JP20 | JP22 | JP23 | JP24 |
|--------------+---------+--------+--------+--------+--------|
| 486DX2 | 2 & 3 | Open | 1 & 2 | 1 & 2 | 3 & 4 |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (TEXAS INSTUMENTS) (CON’T) |
|------------------------------------------------------------|
| Type | JP25 | JP26 | JP27 | JP28 | JP29 |
|--------------+---------+--------+--------+--------+--------|
| 486DX2 | Closed | 5 & 6 | 3 & 4 | 2 & 3 | 1 & 2 |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (IBM) |
|------------------------------------------------------------|
| Type | JP19 | JP20 | JP22 | JP23 | JP24 |
|----------------+--------+-------+--------+--------+--------|
| 486-4V3100GC | 2 & 3 | Open | 1 & 2 | 1 & 2 | 3 & 4 |
|----------------+--------+-------+--------+--------+--------|
| 486-4V3100GIC | 2 & 3 | Open | 5 & 6 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (IBM) (CON’T) |
|------------------------------------------------------------|
| Type | JP25 | JP26 | JP27 | JP28 | JP29 |
|----------------+---------+--------+--------+-------+-------|
| 486-4V3100GC | Closed | 5 & 6 | 3 & 4 | 2 & 3 | 1 & 2 |
|----------------+---------+--------+--------+-------+-------|
| 486-4V3100GIC | Closed | 3 & 4 | 1 & 2 | 2 & 3 | 3 & 4 |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (UMC) |
|------------------------------------------------------------|
| Type | JP19 | JP20 | JP22 | JP23 | JP24 |
|--------------+---------+--------+--------+--------+--------|
| U5S-Super | 2 & 3 | Open | Open | 1 & 2 | Open |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (UMC) (CON’T) |
|------------------------------------------------------------|
| Type | JP25 | JP26 | JP27 | JP28 | JP29 |
|--------------+---------+--------+--------+--------+--------|
| U5S-Super | Open | 1 & 2 | Open | 2 & 3 | Open |
|------------------------------------------------------------|
| Note: Designated pins are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP13/pins 1 | JP13/pins | JP13/pins | JP13/pins |
| | & 2 | 3 & 4 | 5 & 6 | 7 & 8 |
|---------+--------------+-----------+-----------+-----------|
| 3.3v | Open | Closed | Open | Open |
|---------+--------------+-----------+-----------+-----------|
| 3.45v | Open | Open | Closed | Open |
|---------+--------------+-----------+-----------+-----------|
| 3.6v | Open | Open | Open | Closed |
|---------+--------------+-----------+-----------+-----------|
| 4v | Open | Open | Open | Open |
|---------+--------------+-----------+-----------+-----------|
| 5v | Closed | Open | Open | Open |
+------------------------------------------------------------+