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 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Proprietary CPU module |
J6 |
Video port |
P6 |
|
Proprietary external memory card |
J7 |
Keyboard/Bus mouse interface |
P7 |
|
Proprietary video card |
J8, J9, & J10 |
Fan power |
P8 |
|
IDE interface |
P1 |
IDE interface LED |
P9 |
|
Floppy drive interface |
P2 |
External battery |
P10 |
|
Parallel port |
P3 |
Power supply |
P11 & P12 |
|
Serial port (COM1) |
P4 |
Drive power |
P13 |
|
Serial port (COM2) |
P5 |
Drive power |
P14 |
|
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. setting) |
15A1 |
Open | |
|
NEC VGA adapter enabled |
15A1 |
Closed | |
|
Manufacturing test disabled |
15K1 |
closed | |
|
Manufacturing test enabled |
15K1 |
open | |
|
BIOS flash reprogramming disabled |
17H1 |
pins 2 & 3 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 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Test mode disabled |
15A2 & 15A3 |
pins 1 & 2 closed | |
|
Test mode enabled |
15A2 & 15A3 |
pins 2 & 3 closed | |