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# EFA CORPORATION
4MAHL, 4DMU-50AHL
Processor CX486SX/CX487SX/80486SX/80486DX/ODP486SX/80486DX2
Processor 20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set UMC
Max. Onboard 64MB
DRAM
Cache 32/64/128/256KB
BIOS AMI
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2), floppy drive
interface,
game port, IDE interface (2), parallel port,
serial ports (2)
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| Serial port 2 | CN2 | Power LED & | J8 |
| | | keylock | |
|--------------------+----------+-----------------+----------|
| Serial port 1 | CN3 | Reset switch | J9 |
|--------------------+----------+-----------------+----------|
| Floppy drive | CN11 | Game port | JP1 |
| interface | | | |
|--------------------+----------+-----------------+----------|
| IDE interface | CN12 | Turbo switch | JP31 |
|--------------------+----------+-----------------+----------|
| AT bus hard drive | CN13 | Turbo LED | JP32 |
| interface | | | |
|--------------------+----------+-----------------+----------|
| Parallel port | CN14 | Speaker | JP33 |
|--------------------+----------+-----------------+----------|
| External battery | J1 | 32-bit VESA | S1 |
| | | Local bus slot | |
|--------------------+----------+-----------------+----------|
| Hard drive LED | J6 | 32-bit VESA | S2 |
| (AT12) | | Local bus slot | |
|--------------------+----------+-----------------+----------|
| AT bus hard drive | J7 | | |
| LED | | | |
|------------------------------------------------------------|
| Note:The exact location of J7 is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+---------+------------|
| » | HDD I/O CHRDY# disabled | J5 | Open |
|----+--------------------------------+---------+------------|
| | HDD I/O CHRDY# enabled | J5 | Closed |
|----+--------------------------------+---------+------------|
| » | Game port enabled | JP1 | pins 1 & 2 |
| | | | closed |
|----+--------------------------------+---------+------------|
| | Game port disabled | JP1 | pins 2 & 3 |
| | | | closed |
|----+--------------------------------+---------+------------|
| » | IDE interface disabled | JP3 | pins 2 & 3 |
| | | | closed |
|----+--------------------------------+---------+------------|
| | IDE interface enabled | JP3 | pins 1 & 2 |
| | | | closed |
|----+--------------------------------+---------+------------|
| » | Floppy drive interface enabled | JP4 | pins 1 & 2 |
| | | | closed |
|----+--------------------------------+---------+------------|
| | Floppy drive interface | JP4 | pins 2 & 3 |
| | disabled | | closed |
|----+--------------------------------+---------+------------|
| » | AT bus IDE interface or HDC | JP6 | pins 2 & 3 |
| | enabled | | closed |
|----+--------------------------------+---------+------------|
| | AT bus IDE interface or HDC | JP6 | pins 1 & 2 |
| | disabled | | closed |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP8 | Closed |
| | alter | | |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP9 | Open |
| | alter | | |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP10 | N/A |
| | alter | | |
|----+--------------------------------+---------+------------|
| » | AD12 local bus IDE HDD enabled | JP14 | pins 2 & 3 |
| | | | closed |
|----+--------------------------------+---------+------------|
| | AD12 local bus IDE HDD | JP14 | pins 1 & 2 |
| | disabled | | closed |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP15 | pins 2 & 3 |
| | alter | | closed |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP17 | pins 2 & 3 |
| | alter | | closed |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP18 | pins 2 & 3 |
| | alter | | closed |
|----+--------------------------------+---------+------------|
| | 80486SX enabled | JP28 | pins 1 & 2 |
| | | | closed |
|----+--------------------------------+---------+------------|
| | Other CPU enabled | JP28 | pins 2 & 3 |
| | | | closed |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP29 | pins 1 & 2 |
| | alter | | closed |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP30 | pins 1 & 2 |
| | alter | | closed |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP35 | pins 1 & 2 |
| | alter | | closed |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP39 | Open |
| | alter | | |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP40 | Open |
| | alter | | |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP41 | Open |
| | alter | | |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP42 | Open |
| | alter | | |
|----+--------------------------------+---------+------------|
| » | Factory configured - do not | JP50 | N/A |
| | alter | | |
|------------------------------------------------------------|
| Note: JP28 is only configurable when you have a 80486SX |
| PQFP mounted on the mainboard. |
|------------------------------------------------------------|
| The exact location of JP41 is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT CONFIGURATION |
|------------------------------------------------------------|
| Port 1 (CN3) | JP7 | JP5 |
|------------------+--------------------+--------------------|
| » | COM1 | Pins 1 & 2 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | COM3 | Pins 2 & 3 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | Disabled | N/A | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT CONFIGURATION |
|------------------------------------------------------------|
| Port 2 (CN2) | JP11 | JP13 |
|------------------+--------------------+--------------------|
| » | COM2 | Pins 1 & 2 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | COM4 | Pins 2 & 3 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | Disabled | N/A | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT CONFIGURATION |
|------------------------------------------------------------|
| Port | JP2 | JP12 |
|------------------+--------------------+--------------------|
| » | LPT2 | pins 1 & 2 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | LPT3 | pins 2 & 3 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | Disabled | N/A | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 1MB | NONE | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 4MB | NONE | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 16MB | NONE | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 4M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
|------------------+--------------------+--------------------|
| 64MB | NONE | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP21 | JP22 | JP23 | JP26 | JP27 |
|-------+--------+--------+--------+------------+------------|
| 32KB | Open | Open | Open | Open | pins 2 & 3 |
|-------+--------+--------+--------+------------+------------|
| 64KB | Open | Open | Closed | Open | pins 1 & 2 |
|-------+--------+--------+--------+------------+------------|
| 128KB | Open | Closed | Closed | pins 1 & 2 | pins 2 & 3 |
|-------+--------+--------+--------+------------+------------|
| 256KB | Closed | Closed | Closed | pins 2 & 3 | pins 1 & 2 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |SW1/6|SW1/7|
|-------------+------+------+------+------+------+-----+-----|
| CX486SX | On | Off | On | Off | On | Off | Off |
|-------------+------+------+------+------+------+-----+-----|
| CX487SX | On | Off | On | Off | On | Off | Off |
|-------------+------+------+------+------+------+-----+-----|
| CX486S | Off | Off | Off | On | Off | Off | Off |
|-------------+------+------+------+------+------+-----+-----|
| 80486SX | Off | Off | Off | On | Off | Off | Off |
|-------------+------+------+------+------+------+-----+-----|
|80486DX(PQFP)| On | Off | On | Off | On | On | On |
|-------------+------+------+------+------+------+-----+-----|
| 80486DX | On | Off | On | Off | On | Off | Off |
|-------------+------+------+------+------+------+-----+-----|
| ODP486SX | On | On | Off | Off | On | Off | Off |
|-------------+------+------+------+------+------+-----+-----|
| 80486DX2 | On | Off | On | Off | On | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CONT.) |
|------------------------------------------------------------|
| Speed | JP47 | JP49 |
|--------------------+------------------+--------------------|
| CX486SX | N/A | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| CX487SX | N/A | N/A |
|--------------------+------------------+--------------------|
| CX486SX + CX487SX | Closed | pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| CX486S | Open | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| 80486SX | Open | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| 80486DX(PQFP) | Open | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| 80486DX | Open | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| ODP486SX | Open | pins 1 & 2 closed |
|--------------------+------------------+--------------------|
| 80486DX2 | Open | pins 1 & 2 closed |
|------------------------------------------------------------|
| Note:The exact location of JP49 is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | SW2/1 | SW2/2 | SW2/3 | JP48 |
|-----------+---------+---------+--------+-------------------|
| 20MHz | Off | Off | Off | pins 2 & 3 closed |
|-----------+---------+---------+--------+-------------------|
| 25MHz | On | Off | Off | pins 2 & 3 closed |
|-----------+---------+---------+--------+-------------------|
| 33MHz | On | On | On | pins 2 & 3 closed |
|-----------+---------+---------+--------+-------------------|
| 40MHz | On | On | Off | pins 1 & 2 closed |
|-----------+---------+---------+--------+-------------------|
| 50i MHz | On | Off | Off | pins 1 & 2 closed |
|-----------+---------+---------+--------+-------------------|
| 50MHz | Off | Off | On | pins 1 & 2 closed |
|-----------+---------+---------+--------+-------------------|
| 66i MHz | On | On | On | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE/BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | Wait | JP36 | JP37 | JP38 |
| | 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 |
+------------------------------------------------------------+