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# BIOSTAR MICROTECH INTERNATIONAL CORPORATION
MB-8433AEP
Processor 80486SX/CX486M7/CX486DX/AM486DX/AM486DX PLUS/UMC U5/80486DX/
CX486DX2/AM486DX2/AM486DX2 PLUS/80486DX2/AM486DX4/80486DX4/ SL Pentium
Overdrive/Cyrix M1
Processor 25/33/40/66(internal)/75(internal)/80(internal)/100(internal)/120(internal)MHz
Speed
Chip Set AMD
Max. 64MB
Onboard
DRAM
Cache 128/256/512KB
BIOS AMI
Dimensions 220mm x 210mm
I/O PS/2 mouse port, parallel port, serial ports (2), 32-bit PCI slots (3), floppy
Options drive interface, IDE interfaces (2)
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+-------------+--------------+-------------|
| Floppy drive | J4 | Turbo LED | J12 (pins |
| interface | | | 10 & 11) |
|-----------------+-------------+--------------+-------------|
| IDE interface | J5 | Reset switch | J12 (pins |
| (primary) | | | 12 & 13) |
|-----------------+-------------+--------------+-------------|
| Serial port 2 | J6 | Green PC | J12 (pins |
| | | connector | 17 - 19) |
|-----------------+-------------+--------------+-------------|
| IDE interface | J8 | IDE | J12 (pins |
| (secondary) | | interface | 20 - 22) |
| | | LED | |
|-----------------+-------------+--------------+-------------|
| Serial port 1 | J9 | Turbo switch | J12 (pins |
| | | | 23 & 24) |
|-----------------+-------------+--------------+-------------|
| Parallel port | J10 | Chassis fan | JP2 |
| | | power | |
|-----------------+-------------+--------------+-------------|
| External | J11 | 32-bit PCI | PCI1 - PCI3 |
| battery | | slots | |
|-----------------+-------------+--------------+-------------|
| Speaker | J12 (pins 1 | PS/2 mouse | S1 |
| | - 4) | port | |
|-----------------+-------------+--------------+-------------|
| Power LED & | J12 (pins 5 | | |
| keylock | - 9) | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal operation | J11 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | J11 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J13 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| | Flash BIOS voltage select 5v | JP22 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Flash BIOS voltage select 12v | JP22 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Flash BIOS EPROM | JP22 | Open |
|---+----------------------------------+--------+------------|
| » | Internal battery enabled | JP25 | Closed |
|---+----------------------------------+--------+------------|
| | Internal battery disabled | JP25 | Open |
|---+----------------------------------+--------+------------|
| » | Power good signal detect from | JP26 | pins 1 & 2 |
| | power supply | | closed |
|---+----------------------------------+--------+------------|
| | Power good signal detect from | JP26 | pins 2 & 3 |
| | board | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | U2 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | U3 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 2MB | NONE | NONE | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 2M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 2M x 36 | (1) 2M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 4MB | NONE | NONE | (1) 2M x | (1) 2M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 2M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 6MB | NONE | NONE | (1) 2M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | NONE | NONE | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 8M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 2M x 36 | (1) 8M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 10MB | NONE | NONE | (1) 2M x | (1) 8M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 4M x 36 | (1) 8M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 12MB | NONE | NONE | (1) 4M x | (1) 8M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 8M x 36 | (1) 8M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 16MB | NONE | NONE | (1) 8M x | (1) 8M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 16M x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 2M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 18MB | NONE | NONE | (1) 2M x | (1) 16M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 4M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 20MB | NONE | NONE | (1) 4M x | (1) 16M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 8M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 24MB | NONE | NONE | (1) 8M x | (1) 16M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 32M x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 33MB | (1) 1M x 36 | (1) 32M x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 33MB | NONE | NONE | (1) 1M x | (1) 32M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 34MB | (1) 2M x 36 | (1) 32M x | NONE | NONE |
| | | 36 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 34MB | NONE | NONE | (1) 2M x | (1) 32M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 4M x 36 | (1) 32M x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 36MB | NONE | NONE | (1) 4M x | (1) 32M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 8M x 36 | (1) 32M x | NONE | NONE |
| | | 36 | | |
|------+-------------+-------------+------------+------------|
| 40MB | NONE | NONE | (1) 8M x | (1) 32M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 16M x | (1) 32M x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 48MB | NONE | NONE | (1) 16M x | (1) 32M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 32M x | (1) 32M x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 64MB | NONE | NONE | (1) 32M x | (1) 32M x |
| | | | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | (1) 8K x 8 |
|------------------+--------------------+--------------------|
| 256KB (A) | (4) 64K x 8 | (1) 16K x 8 |
|------------------+--------------------+--------------------|
| 256KB (B) | (4) 64K x 8 | (1) 32K x 8 |
|------------------+--------------------+--------------------|
| 512KB | (4) 64K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP20 | JP21 |
|------------------+--------------------+--------------------|
| 128KB | pins 1 & 2 closed | Open |
|------------------+--------------------+--------------------|
| 256KB (A) | Open | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 256KB (B) | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 512KB | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP5 | JP6 | JP7 | JP8 |
|----------------+----------+----------+----------+----------|
| 80486SX | 5 & 6 | Open | 2 & 3, 4 | Open |
| | | | & 5 | |
|----------------+----------+----------+----------+----------|
| CX486DX | 1 & 2, 4 | Open | 1 & 2, 4 | 1 & 2 |
| | & 5 | | & 5 | |
|----------------+----------+----------+----------+----------|
| AM486DX | 1 & 2, 4 | Open | 2 & 3, 4 | Open |
| | & 5 | | & 5 | |
|----------------+----------+----------+----------+----------|
| AM486DX PLUS | 1 & 2, 4 | Open | 1 & 2 | Open |
| WB | & 5 | | | |
|----------------+----------+----------+----------+----------|
| AM486DX PLUS | 1 & 2, 4 | 5 & 6 | 1 & 2, 4 | Open |
| WT | & 5 | | & 5 | |
|----------------+----------+----------+----------+----------|
| U5 | Open | Open | 4 & 5 | Open |
|----------------+----------+----------+----------+----------|
| 80486DX | 1 & 2, 4 | Open | 2 & 3, 4 | Open |
| | & 5 | | & 5 | |
|----------------+----------+----------+----------+----------|
| CX486DX2 | 1 & 2, 4 | 1 & 2 | 1 & 2, 4 | 1 & 2, 3 |
| | & 5 | | & 5 | & 4 |
|----------------+----------+----------+----------+----------|
| AM486DX2 | 1 & 2, 4 | 4 & 5 | 2 & 3, 4 | Open |
| | & 5 | | & 5 | |
|----------------+----------+----------+----------+----------|
| AM486DX2 PLUS | 1 & 2, 4 | 3 & 4 | 1 & 2 | Open |
| WB | & 5 | | | |
|----------------+----------+----------+----------+----------|
| AM486DX2 PLUS | 1 & 2, 4 | 3 & 4, 5 | 1 & 2, 4 | Open |
| WT | & 5 | & 6 | & 5 | |
|----------------+----------+----------+----------+----------|
| 80486DX2 | 1 & 2, 4 | 4 & 5 | 2 & 3, 4 | Open |
| | & 5 | | & 5 | |
|----------------+----------+----------+----------+----------|
| CX486DX4 | 1 & 2, 4 | Open | 1 & 2, 4 | 1 & 2 |
| | & 5 | | & 5 | |
|----------------+----------+----------+----------+----------|
| AM486DX4 | 1 & 2, 4 | Open | 2 & 3, 4 | Open |
| | & 5 | | & 5 | |
|----------------+----------+----------+----------+----------|
| AM486DX4 PLUS | 1 & 2, 4 | Open | 1 & 2 | Open |
| WB | & 5 | | | |
|----------------+----------+----------+----------+----------|
| AM486DX2 PLUS | 1 & 2, 4 | 5 & 6 | 1 & 2, 4 | Open |
| WT | & 5 | | & 5 | |
|----------------+----------+----------+----------+----------|
| 80486DX4 | 1 & 2, 4 | Open | 1 & 2, 4 | Open |
| | & 5 | | & 5 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP5 | JP6 | JP7 | JP8 |
|---------+----------------+--------+---------------+--------|
| P24D | 1 & 2, 4 & 5 | Open | 1 & 2 | Open |
|---------+----------------+--------+---------------+--------|
| M1 | 1 & 2, 4 & 5 | Open | 1 & 2, 4 & 5 | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | RN6 | RN7 | RN8 | RN9 |
|-----------+-----------+-----------+-----------+------------|
| 80486SX | Not | Installed | Not | Installed |
| | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| CX486DX | Not | Not | Installed | Not |
| | installed | installed | | installed |
|-----------+-----------+-----------+-----------+------------|
| AM486DX | Not | Installed | Not | Installed |
| | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| AM486DX | Not | Installed | Not | Installed |
| PLUS WB | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| AM486DX | Not | Installed | Not | 1 - 4 |
| PLUS WT | installed | | installed | installed |
| | | | | only |
|-----------+-----------+-----------+-----------+------------|
| U5 | Installed | Not | Not | Not |
| | | installed | installed | installed |
|-----------+-----------+-----------+-----------+------------|
| 80486DX | Not | Installed | Not | Installed |
| | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| CX486DX2 | Not | Not | Installed | Not |
| | installed | installed | | installed |
|-----------+-----------+-----------+-----------+------------|
| AM486DX2 | Not | Installed | Not | Installed |
| | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| AM486DX2 | Not | Installed | Not | Installed |
| PLUS WB | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| AM486DX2 | Not | Installed | Not | 1 - 4 |
| PLUS WT | installed | | installed | installed |
| | | | | only |
|-----------+-----------+-----------+-----------+------------|
| 80486DX2 | Not | Installed | Not | Installed |
| | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| CX486DX4 | Not | Not | Installed | Not |
| | installed | installed | | installed |
|-----------+-----------+-----------+-----------+------------|
| AM486DX4 | Not | Installed | Not | Installed |
| | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| AM486DX4 | Not | Installed | Not | Installed |
| PLUS WB | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| AM486DX4 | Not | Installed | Not | 1 - 4 |
| PLUS WT | installed | | installed | installed |
| | | | | only |
|-----------+-----------+-----------+-----------+------------|
| 80486DX4 | Not | Installed | Not | Installed |
| | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| P24D | Not | Installed | Not | Installed |
| | installed | | installed | |
|-----------+-----------+-----------+-----------+------------|
| M1 | Not | Installed | Not | 1 - 4 |
| | installed | | installed | installed |
| | | | | only |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP11 | JP16 | JP18 | JP19 |
|----------+-------------------+---------+---------+---------|
| 25MHz | pins 1 & 2 closed | Open | Open | Open |
|----------+-------------------+---------+---------+---------|
| 33MHz | pins 1 & 2 closed | Open | Closed | Closed |
|----------+-------------------+---------+---------+---------|
| 40MHz | pins 2 & 3 closed | Closed | Open | Closed |
|----------+-------------------+---------+---------+---------|
| 66iMHz | pins 1 & 2 closed | Open | Closed | Closed |
|----------+-------------------+---------+---------+---------|
| 75iMHz | pins 1 & 2 closed | Open | Open | Open |
|----------+-------------------+---------+---------+---------|
| 80iMHz | pins 2 & 3 closed | Closed | Open | Closed |
|----------+-------------------+---------+---------+---------|
| 100iMHz | pins 1 & 2 closed | Open | Closed | Closed |
|----------+-------------------+---------+---------+---------|
| 120iMHz | pins 2 & 3 closed | Closed | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP1 | JP3 | JP4 |
|--------------+-------------------+------------+------------|
| 3.45v | pins 2 & 3 closed | Open | Open |
|--------------+-------------------+------------+------------|
| 4v | pins 1 & 2 closed | Open | Open |
|--------------+-------------------+------------+------------|
| 5v | pins 2 & 3 closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CONFIGURATION |
|------------------------------------------------------------|
| DMA | JP9 | JP10 |
|------------------+--------------------+--------------------|
| DMA 1 | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| DMA 3 | pins 2 & 3 closed | pins 1 & 2 closed |
+------------------------------------------------------------+