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# EPSON, INC.
ACTION DESK 4000
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 25/33/50(internal)/66(internal)MHz
Chip Set Unidentified
Video Chip Set Cirrus Logic
Maximum Onboard 64MB
Memory
Maximum Video 2MB
Memory
Cache 64/128/256KB
BIOS Unidentified
Dimensions 220mm x 220mm
I/O Options Floppy drive interface, IDE interface,
parallel port, PS/2 mouse port, serial ports
(2), VGA port, riser slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Floppy drive | CN1 | VGA port | CN6 |
| interface | | | |
|-------------------+----------+------------------+----------|
| PS/2 mouse port | CN2 | IDE interface 1 | CN7 |
|-------------------+----------+------------------+----------|
| Serial port 1 | CN3 | Front panel | CN8 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Serial port 2 | CN4 | Turbo switch | J22 |
|-------------------+----------+------------------+----------|
| Parallel port | CN5 | Riser slot | SL1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Parallel port LPT select LPT1 | J5 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Parallel port LPT select LPT2 | J5 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Serial port 1 COM select COM1 | J6 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Serial port 1 COM select COM3 | J6 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Serial port 2 COM select COM2 | J7 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Serial port 2 COM select COM4 | J7 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Floppy drive interface enabled | J8 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Floppy drive interface disabled | J8 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Turbo enabled | J22 | Open |
|---+---------------------------------+-------+--------------|
| | Turbo disabled | J22 | Closed |
|---+---------------------------------+-------+--------------|
| » | Battery type select internal | J34 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | CMOS memory clear | J34 | Pins 3 & 4 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | IDE interface enabled | J35 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | IDE interface disabled | J35 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (1) 1M x 36 | None |
|------------------+--------------------+--------------------|
| 5MB | (1) 1M x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 6MB | (1) 1M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 2M x 36 | None |
|------------------+--------------------+--------------------|
| 9MB | (1) 2M x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 10MB | (1) 2M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 12MB | (1) 1M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (1) 2M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 4M x 36 | None |
|------------------+--------------------+--------------------|
| 17MB | (1) 4M x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 18MB | (1) 4M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 4M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 24MB | (1) 4M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 8M x 36 | None |
|------------------+--------------------+--------------------|
| 33MB | (1) 8M x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 34MB | (1) 8M x 36 | (1) 512K x 36 |
|------------------+--------------------+--------------------|
| 36MB | (1) 8M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 40MB | (1) 8M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (1) 4M x 36 | (1) 8M x 36 |
|------------------+--------------------+--------------------|
| 48MB | (1) 8M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 64MB | (1) 8M x 36 | (1) 8M x 36 |
|------------------------------------------------------------|
| Note: The location of banks 0 & 1 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------------------------------------------------|
| Note: The location of banks 0 & 1 and the TAG are |
| unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J25 | J26 | J27 | J28 |
|-------+-------------+------------+------------+------------|
| 64KB | Pins 1 & 2 | Pins 1 & 2 | Open | Pins 2 & 3 |
| | closed | closed | | closed |
|-------+-------------+------------+------------+------------|
| 128KB | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 256KB | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|----------------+------------------+------------------------|
| 1MB | 1MB | None |
|----------------+------------------+------------------------|
| 2MB | 1MB | (2) 256K x 16 |
|------------------------------------------------------------|
| Note: Bank 0 is factory installed and is not configurable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | J16 |
|----------------------------+-------------------------------|
| 25MHz | Pins 5 & 6 closed |
|----------------------------+-------------------------------|
| 33MHz | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 50iMHz | Pins 5 & 6 closed |
|----------------------------+-------------------------------|
| 66iMHz | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | J17 | J19 |
|------------+--------------------------+--------------------|
| 80486SX | Pins 2 & 3 closed | Open |
|------------+--------------------------+--------------------|
| 80487SX | Pins 1 & 2, 3 & 4 closed | Pins 2 & 3 closed |
|------------+--------------------------+--------------------|
| 80486DX | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed |
|------------+--------------------------+--------------------|
| 80486DX2 | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed |
+------------------------------------------------------------+