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# EFA CORPORATION
ECA 33M50
Processor 80386DX/80486SX/80486DX
Processor Speed 16/20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set UMC
Max. Onboard 32MB
DRAM
SRAM Cache 64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Power LED & | J1 | Turbo LED | J4 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Speaker | J2 | Turbo switch | J5 |
|-------------------+----------+------------------+----------|
| Reset switch | J3 | External battery | J17 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome | J16 | open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | J16 | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J21 | open |
| | alter | | |
|---+----------------------------------+--------+------------|
| | BIOS type select 64K | J22 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | BIOS type select 128K | J22 | pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM | Location | TAG (U22) | TAG (U24) |
|-------+-------------+------------+------------+------------|
| 64KB | (8) 8K x 8 | Banks 0 & | (1) 32K x | (1) 16K x |
| | | 1 | 8 | 4 |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 32K x | (1) 16K x |
| | | | 8 | 4 |
|-------+-------------+------------+------------+------------|
| 256KB | (8) 32K x 8 | Banks 0 & | (1) 32K x | (1) 16K x |
| | | 1 | 8 | 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
|Size | J7 |J8 | J9 | J10 | J11 | J12 | J13 |J14 | J15 |
|-----+----+---+------+------+------+------+------+----+-----|
|64KB |2 & |2 &| open | open | open | open |closed|1 & |open |
| | 3 | 3 | | | | | | 2 | |
|-----+----+---+------+------+------+------+------+----+-----|
|128KB|1 & |2 &| open |closed| open |closed|closed|2 & |1 & 2|
| | 2 | 3 | | | | | | 3 | |
|-----+----+---+------+------+------+------+------+----+-----|
|256KB|1 & |1 &|closed|closed|closed|closed|closed|1 & |2 & 3|
| | 2 | 2 | | | | | | 2 | |
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU | S1 | S1 | S1 | S1 | S2 |Jumper |
| | | | | | | |
| |switch 1|switch 2|switch |switch |switch | J23 |
| | | | 3 | 4 | 1-6 | |
|----------+--------+--------+-------+-------+-------+-------|
| 80486DX2 | closed | closed | open | open | open |pins 1 |
| | | | | | | & 2 |
|----------+--------+--------+-------+-------+-------+-------|
| ODP486SX | closed | closed | open | open | open |pins 2 |
| | | | | | | & 3 |
|----------+--------+--------+-------+-------+-------+-------|
| 80486DX | closed | closed | open | open | open |pins 1 |
| | | | | | | & 2 |
|----------+--------+--------+-------+-------+-------+-------|
|80487SX-25| closed | closed | open | open | open |pins 2 |
| | | | | | | & 3 |
|----------+--------+--------+-------+-------+-------+-------|
|80487SX-20| closed | closed | open |closed | open |pins 2 |
| | | | | | | & 3 |
|----------+--------+--------+-------+-------+-------+-------|
|80486SX-25| open | open |closed | open | open | open |
|----------+--------+--------+-------+-------+-------+-------|
|80486SX-20| open | open |closed |closed | open | open |
|----------+--------+--------+-------+-------+-------+-------|
| 80386DX | closed | closed | open | open |closed | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU |iOSC | S3 | S3 | S3 | S3 | S2 |
| | | | | | | |
| |SPEED|switch 1|switch 2|switch |switch |switchs |
| | | | | 3 | 4 | 1-6 |
|-----------+-----+--------+--------+-------+-------+--------|
|80486DX2-50|25MHz| closed | closed | open |closed | open |
|-----------+-----+--------+--------+-------+-------+--------|
|ODP486SX-66|33MHz| closed | open |closed |closed | open |
|-----------+-----+--------+--------+-------+-------+--------|
|ODP486SX-50|25MHz| closed | closed | open |closed | open |
|-----------+-----+--------+--------+-------+-------+--------|
|80486DX-50 |50MHz| open | open | open | open | open |
|-----------+-----+--------+--------+-------+-------+--------|
|80486DX-33 |33MHz| closed | open |closed |closed | open |
|-----------+-----+--------+--------+-------+-------+--------|
|80486DX-25 |25MHz| closed | closed | open |closed | open |
|-----------+-----+--------+--------+-------+-------+--------|
|80487SX-25 |25MHz| closed | closed | open |closed | open |
|-----------+-----+--------+--------+-------+-------+--------|
|80487SX-20 |40MHz| open | open |closed | open | open |
|-----------+-----+--------+--------+-------+-------+--------|
|80486SX-25 |25MHz| closed | closed | open |closed | open |
|-----------+-----+--------+--------+-------+-------+--------|
|80486SX-20 |40MHz| open | open |closed | open | open |
|-----------+-----+--------+--------+-------+-------+--------|
|80386DX-40 |80MHz| closed | open | open | open | closed |
|-----------+-----+--------+--------+-------+-------+--------|
|80386DX-33 |66MHz| open | open | open |closed | closed |
|-----------+-----+--------+--------+-------+-------+--------|
|80386DX-20 |20MHz| closed | closed |closed | open | closed |
|-----------+-----+--------+--------+-------+-------+--------|
|80386DX-16 |16MHz| closed | closed |closed |closed | closed |
+------------------------------------------------------------+