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# EPSON, INC.
EQUITY 4 SERIES
Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor 20/25/33/50(internal)/66(internal) MHz
Speed
Chip Set Toshiba
Max. Onboard 32MB
DRAM
SRAM Cache None
BIOS Award
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, IDE interface, parallel
port, PS/2 mouse port, PS/2 keyboard connector,
proprietary riser card, serial port (2), VGA
feature connector, VGA port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| PS/2 mouse port | CN2 | Reserved for | CN11 |
| | | future use | |
|------------------+----------+-------------------+----------|
| PS/2 keyboard | CN3 | Speaker | CN12 |
|------------------+----------+-------------------+----------|
| Serial port 2 | CN4 | Reserved for | CN13 |
| | | future use | |
|------------------+----------+-------------------+----------|
| Serial port 1 | CN5 | Reserved for | CN14 |
| | | future use | |
|------------------+----------+-------------------+----------|
| Parallel port | CN6 | Reserved for | CN15 |
| | | future use | |
|------------------+----------+-------------------+----------|
| VGA port | CN7 | IDE interface LED | CN16 |
|------------------+----------+-------------------+----------|
| VGA feature | CN8 | Power LED | CN17 |
| connector | | | |
|------------------+----------+-------------------+----------|
| Floppy drive | CN9 | Proprietary riser | SLOT1 |
| interface | | card | |
|------------------+----------+-------------------+----------|
| IDE interface | CN10 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select monochrome | J5 | Open |
|---+----------------------------------+--------+------------|
| | Monitor type select color | J5 | Closed |
|---+----------------------------------+--------+------------|
| » | Onboard video enabled | J6 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Onboard video disabled | J6 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | J7 | Open |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | J7 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J8 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J13 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J14 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J15 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Fast Gate A20 enabled | J18 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Fast Gate A20 disabled | J18 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (1) 256K x 36 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (1) 256K x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 4MB | (1) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (1) 256K x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 4M x 36 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (1) 256K x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | J19 | J20 | J21 | J22 |
|------------+------------+----------+------------+----------|
| 20MHz | Closed | Open | Closed | Open |
|------------+------------+----------+------------+----------|
| 25/50i MHz | Open | Open | Closed | Open |
|------------+------------+----------+------------+----------|
| 33/66i MHz | Closed | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU | Type | J10 | J11 | J12 | J23 |
|---------+------+----------+----------+----------+----------|
| 80486SX | PQFP | pins 1 & | pins 1 & | pins 2 & | pins 1 & |
| | | 2 | 2 | 3 | 2 |
|---------+------+----------+----------+----------+----------|
| 80486SX | PGA | pins 2 & | pins 2 & | Open | pins 2 & |
| | | 3 | 3 | | 3 |
|---------+------+----------+----------+----------+----------|
| 80487SX | PGA | pins 1 & | pins 1 & | pins 2 & | pins 2 & |
| | | 2 | 2 | 3 | 3 |
|---------+------+----------+----------+----------+----------|
| 80486DX | PGA | pins 1 & | pins 1 & | pins 1 & | pins 2 & |
| | | 2 | 2 | 2 | 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+