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# EFA CORPORATION
4M50HL2S
Processor 80486SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed 20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set UMC
Max. Onboard DRAM 32MB
Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2)
NPU Options None
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J1 | Reset switch | J10 |
|------------------+----------+-------------------+----------|
| Turbo LED | J7 | 32-bit VESA Local | S1 |
| | | bus slot | |
|------------------+----------+-------------------+----------|
| Speaker | J8 | 32-bit VESA Local | S2 |
| | | bus slot | |
|------------------+----------+-------------------+----------|
| Power LED & | J9 | | |
| keylock | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | J3 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Speed set Turbo | J11 | Open |
|---+----------------------------------+--------+------------|
| | Speed normal | J11 | Closed |
|---+----------------------------------+--------+------------|
| » | CPU type package PGA | J12 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU type package PQFP | J12 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J13 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Western Digital HDD WDAC2340 | J17 | pins 2 & 3 |
| | installed | | closed |
|---+----------------------------------+--------+------------|
| | Western Digital HDD WDAC2340 not | J17 | pins 1 & 2 |
| | installed | | closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | W1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | W1 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | On board battery enabled | W2 | Closed |
|---+----------------------------------+--------+------------|
| | On board battery disabled | W2 | Open |
|------------------------------------------------------------|
| Note:The exact location of W2 is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+----------------+----------------+-------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | 8K x 8 |
|------------+----------------+----------------+-------------|
| 128KB | (4) 32K x 8 | NONE | 8K x 8 |
|------------+----------------+----------------+-------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | W4 | W5 | W6 | W7 | W8 | W9 | W10 | W11 |
|------+------+------+-----+-----+------+------+------+------|
| 64KB |1 & 2 |1 & 2 |1 & 2|Open | Open | Open | Open | Open |
|------+------+------+-----+-----+------+------+------+------|
|128KB |2 & 3 |1 & 2 |2 & 3|1 & 2| Open |Closed| Open |Closed|
|------+------+------+-----+-----+------+------+------+------|
|256KB |2 & 3 |2 & 3 |1 & 2|2 & 3|Closed|Closed|Closed|Closed|
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | SW3/1 | SW3/2 | SW3/3 | SW3/4 | SW3/5 | SW3/6 |
|------------+-------+-------+-------+-------+-------+-------|
| 80486SX/20 | Off | Off | Off | On | On | Off |
|------------+-------+-------+-------+-------+-------+-------|
| 80486SX/25 | Off | Off | Off | Off | On | Off |
|------------+-------+-------+-------+-------+-------+-------|
| 80486SX/33 | Off | Off | Off | Off | On | Off |
|------------+-------+-------+-------+-------+-------+-------|
| 80486DX | Off | On | On | Off | Off | Off |
|------------+-------+-------+-------+-------+-------+-------|
| Pentium | Off | On | On | Off | Off | Off |
| Overdrive | | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | J6 | J13 | J14 | J15 | JP1 | JP3 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486SX | pins 2 | pins 2 | pins | pins | pins | pins |
| | & 3 | & 3 | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486DX | pins 2 | pins 2 | pins | pins | pins | pins |
| | & 3 | & 3 | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486DX2 | pins 2 | pins 2 | pins | pins | pins | pins |
| | & 3 | & 3 | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |
|----------+--------+--------+-------+-------+-------+-------|
| ODP486SX | pins 2 | pins 2 | pins | pins | pins | pins |
| | & 3 | & 3 | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|-------------+-----------+-----------+-----------+----------|
| 20MHz | Off | Off | On | Off |
|-------------+-----------+-----------+-----------+----------|
| 25MHz | On | On | Off | On |
|-------------+-----------+-----------+-----------+----------|
| 33MHz | On | Off | On | On |
|-------------+-----------+-----------+-----------+----------|
| 40MHz | Off | Off | On | Off |
|-------------+-----------+-----------+-----------+----------|
| 50i MHz | On | On | Off | On |
|-------------+-----------+-----------+-----------+----------|
| 50MHz | Off | Off | Off | Off |
|-------------+-----------+-----------+-----------+----------|
| 66i MHz | On | Off | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE/BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | Wait | J4 | J5 | J16 |
| | states | | | |
|-----------+--------+---------------+------------+----------|
| £ 33MHz | 0 wait | pins 1 & 2 | pins 1 & 2 | pins 1 & |
| | states | closed | closed | 2 closed |
|-----------+--------+---------------+------------+----------|
| > 33MHz | 1 wait | pins 2 & 3 | pins 2 & 3 | pins 2 & |
| | state | closed | closed | 3 closed |
+------------------------------------------------------------+