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# NEC TECHNOLOGIES, INC.
POWERMATE EXPRESS 486SX/20E, 486SX/25E
Processor 80486SX
Processor Speed 20/25MHz
Chip Set Intel
Max. Onboard DRAM 16MB
Cache None
BIOS NEC
Dimensions 330.2mm x 218.4mm
I/O Options Proprietary CPU module slot, keyboard/bus
mouse interface,serial ports (2), parallel
port, video port, proprietary video card
sockets, proprietary external memory card
slot, IDE interface, floppy drive interface
NPU Options 80487SX/4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Proprietary CPU | J6 | Video port | P6 |
| module | | | |
|------------------+----------+-------------------+----------|
| Proprietary | J7 | Keyboard/Bus | P7 |
| external memory | | mouse interface | |
| card | | | |
|------------------+----------+-------------------+----------|
| Proprietary | J8, J9, | Fan power | P8 |
| video card | & J10 | | |
|------------------+----------+-------------------+----------|
| IDE interface | P1 | IDE interface LED | P9 |
|------------------+----------+-------------------+----------|
| Floppy drive | P2 | External battery | P10 |
| interface | | | |
|------------------+----------+-------------------+----------|
| Parallel port | P3 | Power supply | P11 & |
| | | | P12 |
|------------------+----------+-------------------+----------|
| Serial port | P4 | Drive power | P13 |
| (COM1) | | | |
|------------------+----------+-------------------+----------|
| Serial port | P5 | Drive power | P14 |
| (COM2) | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Password enabled | 3F1 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Password disabled | 3F1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Test mode disabled | 10A1 | Open |
|---+----------------------------------+--------+------------|
| | Test mode enabled | 10A1 | Closed |
|---+----------------------------------+--------+------------|
| » | I/O recovery disabled | 11B5 | Open |
|---+----------------------------------+--------+------------|
| | I/O recovery enabled | 11B5 | Closed |
|---+----------------------------------+--------+------------|
| » | NEC VGA adapter disabled (U.S. | 15A1 | Open |
| | setting) | | |
|---+----------------------------------+--------+------------|
| | NEC VGA adapter enabled | 15A1 | Closed |
|---+----------------------------------+--------+------------|
| » | Manufacturing test disabled | 15K1 | closed |
|---+----------------------------------+--------+------------|
| | Manufacturing test enabled | 15K1 | open |
|---+----------------------------------+--------+------------|
| » | BIOS flash reprogramming | 17H1 | pins 2 & 3 |
| | disabled | | closed |
|---+----------------------------------+--------+------------|
| | BIOS flash reprogramming enabled | 17H1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | ROM type select 27C256 (28F256) | 18F1 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | ROM type select 27C512 (28F512) | 18F1 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (2) 256K x 36 | (2) 256K x 36 |
|------------------+--------------------+--------------------|
| 8MB | (2) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 16MB | (2) 1M x 36 | (2) 1M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT CONFIGURATION |
|------------------------------------------------------------|
| Setting | 15C3 |
|----------------------------+-------------------------------|
| LPT1/IRQ7, LPT2/IRQ5 | pins 1 & 2, 5 & 6 closed |
|----------------------------+-------------------------------|
| LPT1/IRQ5, LPT2/IRQ7 | pins 2 & 3, 4 & 5 closed |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------+-------------+-------------------|
| » | Test mode disabled | 15A2 & 15A3 | pins 1 & 2 closed |
|---+----------------------+-------------+-------------------|
| | Test mode enabled | 15A2 & 15A3 | pins 2 & 3 closed |
+------------------------------------------------------------+