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# BETHEL ELECTRONICS INTERNATIONAL, INC.
HYF-82481Q
Processor CX486S/80486SX/SL80486SX/CX486DX/UMCU5/80486DX/SL80486DX/
CX486DX2/AM486DX2/80486DX2/SL80486DX2/AM486DX4/80486DX4
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set Unidentified
Max. 128MB
Onboard
DRAM
Cache 128/256/512/1024KB
BIOS Award
Dimensions 250mm x 220mm
I/O 32-bit VESA local bus slots (3)
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Chassis fan power | CN1 | Turbo switch | JP9 |
|-------------------+----------+------------------+----------|
| Speaker | JP6 | Power LED & | JP10 |
| | | keylock | |
|-------------------+----------+------------------+----------|
| Reset switch | JP7 | 32-bit VESA | SL1 - |
| | | local bus slots | SL3 |
|-------------------+----------+------------------+----------|
| Turbo LED | JP8 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|------------------------------------+----------+------------|
| » | CMOS memory normal operation | JP3 | Open |
|---+--------------------------------+----------+------------|
| | CMOS memory clear | JP3 | Closed |
|---+--------------------------------+----------+------------|
| » | Turbo switch enabled | JP9 | Open |
|---+--------------------------------+----------+------------|
| | Turbo switch disabled | JP9 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+---------------+-------------+------------+----------|
| 1MB | (1) 256K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 256K x 36 | (1) 256K x | NONE | NONE |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 512K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 256K x 36 | (1) 256K x | (1) 512K x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 512K x 36 | (1) 512K x | NONE | NONE |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 5MB | (1) 256K x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 6MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 6MB | (1) 512K x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 256K x 36 | (1) 256K x | (1) 512K x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 10MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 12MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 17MB | (1) 256K x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 18MB | (1) 256K x 36 | (1) 256K x | (1) 4M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 18MB | (1) 512K x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 20MB | (1) 512K x 36 | (1) 512K x | (1) 4M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 32MB | (1) 8M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 36MB | (1) 512K x 36 | (1) 512K x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 36MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 36MB | (1) 1M x 36 | (1) 8M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 40MB | (1) 1M x 36 | (1) 1M x 36 | (1) 8M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 48MB | (1) 4M x 36 | (1) 8M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 64MB | (1) 16M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 8M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 | NONE | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 65MB | (1) 256K x | (1) 16M x | NONE | NONE |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 68MB | (1) 1M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 68MB | (1) 1M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 72MB | (1) 1M x 36 | (1) 1M x | (1) 16M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 72MB | (1) 1M x 36 | (1) 1M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 80MB | (1) 4M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 80MB | (1) 4M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 4M x 36 | (1) 4M x | (1) 16M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 16M x | (1) 16M x | NONE | NONE |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 64K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 128K x 8 | (4) 128K x 8 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP11 | JP12 | W3 |
|---------------+------------------+------------+------------|
| 80486SX | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|---------------+------------------+------------+------------|
| 80486DX | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|---------------+------------------+------------+------------|
| 80486DX2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| (3.3v) | closed | closed | closed |
|---------------+------------------+------------+------------|
| 80486DX2 (5v) | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|---------------+------------------+------------+------------|
| 80486DX4 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| (3.3v) | closed | closed | closed |
|---------------+------------------+------------+------------|
| 80486DX4 (5v) | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | W1 |
|----------------------------+-------------------------------|
| 25MHz | Open |
|----------------------------+-------------------------------|
| 33MHz | pins 1 & 2, 3 & 4 closed |
|----------------------------+-------------------------------|
| 40MHz | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| 50iMHz | Open |
|----------------------------+-------------------------------|
| 50MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 66iMHz | pins 1 & 2, 3 & 4 closed |
|----------------------------+-------------------------------|
| 75iMHz | Open |
|----------------------------+-------------------------------|
| 100iMHz | pins 1 & 2, 3 & 4 closed |
+------------------------------------------------------------+