NEC TECHNOLOGIES, INC.
BusinessMate 486/25E
|
Processor |
80486DX |
|
Processor Speed |
25MHz |
|
Chip Set |
Intel |
|
Max. Onboard DRAM |
16MB (on system memory card) |
|
Cache |
None |
|
BIOS |
NEC (flash EEPROM) |
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Dimensions |
330mm x 218mm |
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I/O Options |
Proprietary serial/parallel card, keyboard/Bus mouse interface, floppy drive interface, proprietary system memory bus |
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NPU Options |
80387/3167 |
|
CONNECTIONS |
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Purpose |
Location |
Purpose |
Location |
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Proprietary system memory bus |
J8 |
Floppy drive interface |
P7 |
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Speaker |
P1 |
Power supply |
P8 |
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Keyboard/Bus mouse interface |
P2 |
Drive power supply |
P9 |
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External battery |
P3 |
Proprietary serial/parallel card |
P10 |
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Power LED & Turbo LED |
P6 |
Auxiliary drive power supply |
P12 |
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Note: Either a proprietary system memory card or a proprietary memory bus expansion card may be installed at J8. The proprietary memory bus expansion card has four slots that may be populated by up to four 2MB expansion cards. |
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USER CONFIGURABLE SETTINGS |
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Function |
Jumper/Switch |
Position |
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RDY signal from DODA select DMY RDY |
11B2 |
pins 1 & 2 closed |
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|
RDY signal from DODA select BRDY |
11B2 |
pins 2 & 3 closed |
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|
Factory configured - do not alter |
18F1 |
Open |
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EISA memory write speed select 0 wait states |
18F2 |
Closed |
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EISA memory write speed select 1 wait state |
18F2 |
Open |
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CPU self-test enabled |
21D1 & 4D1 |
pins 1 & 2 closed |
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CPU self-test enabled |
21D1 & 4D1 |
pins 2 & 3 closed |
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Floppy interface transfer rate 500/300/250/150/125KB |
2D1 |
pins 1 & 2 closed |
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Floppy interface transfer rate 500/300/250/150KB |
2D1 |
pins 2 & 3 closed |
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Reset enabled |
2J1 |
Open |
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Reset disabled |
2J1 |
Closed |
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Test mode disabled |
2N2 |
Open |
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Test mode enabled |
2N2 |
Closed |
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Password enabled |
5J2 |
pins 1 & 2 closed |
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Password disabled |
5J2 |
pins 2 & 3 closed |
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A20 gate output select keyboard controller |
5J3 |
pins 1 & 2 closed |
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A20 gate output select PAL (Novell workaround) |
5J3 |
pins 2 & 3 closed |
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Keyboard controller W/R select PAL (Novell workaround) |
5K3 |
pins 1 & 2 closed |
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Keyboard controller W/R select normal XIOWT |
5K3 |
pins 2 & 3 closed |
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Keyboard controller input select 12HMz |
5K4 |
pins 1 & 2 closed |
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|
Keyboard controller input select 8.33HMz |
5K4 |
pins 2 & 3 closed |
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STBY signal for RTC select PWREN -0 |
6K3 |
pins 1 & 2 closed |
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STBY signal for RTC select PWREN +0 |
6K3 |
pins 2 & 3 closed |
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ROM test mode (looping) disabled |
8M2 |
Open |
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ROM test mode (looping) enabled |
8M2 |
Closed |
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Factory configured - do not alter |
9E1 |
pins 2 & 3 closed |
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Factory configured - do not alter |
9E2 |
pins 2 & 3 closed |
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Monitor type select color |
SW1/1 |
On |
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Monitor type select monochrome |
SW1/1 |
Off |
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Floppy drive interface address select primary (drive A) |
SW1/2 |
Off |
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Floppy drive interface address select secondary (drive B) |
SW1/2 |
On |
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Floppy drive interface enabled |
SW1/3 |
On |
|
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Floppy drive interface disabled |
SW1/3 |
Off |
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USER CONFIGURABLE SETTINGS (CON'T) |
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Function |
Switch |
Position |
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Serial port (COM2) enabled |
SW1/4 |
On |
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Serial port (COM2) disabled |
SW1/4 |
Off |
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Serial port (COM1) enabled |
SW1/5 |
On |
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Serial port (COM1) disabled |
SW1/5 |
Off |
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Parallel port enabled |
SW1/6 |
On |
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Parallel port disabled |
SW1/6 |
Off |
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NPU enabled |
SW1/7 |
On |
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NPU disabled |
SW1/7 |
Off |
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Bus mouse enabled |
SW1/8 |
On |
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Bus mouse disabled |
SW1/8 |
Off |
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Base memory size select 640KB |
SW1/9 |
On |
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Base memory size select 512KB |
SW1/9 |
Off |
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Factory configured - do not alter |
SW1/10 |
Off |
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Notes: Serial parallel ports are located on the proprietary serial/parallel card. |
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MEMORY READ SPEED CONFIGURATION |
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Wait states |
18F3 |
19F1 |
|
0 |
Closed |
Closed |
|
1 |
Open |
Closed |
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2 |
Closed |
Open |
|
3 |
Open |
Open |
SYSTEM MEMORY CARD (G8FHW)
|
DRAM CONFIGURATION |
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|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
Bank 4 |
Bank 5 |
Bank 6 |
Bank 7 |
|
2MB |
2MB |
NONE |
NONE |
NONE |
NONE |
NONE |
NONE |
NONE |
|
4MB |
2MB |
2MB |
NONE |
NONE |
NONE |
NONE |
NONE |
NONE |
|
6MB |
2MB |
2MB |
2MB |
NONE |
NONE |
NONE |
NONE |
NONE |
|
8MB |
2MB |
2MB |
2MB |
2MB |
NONE |
NONE |
NONE |
NONE |
|
10MB |
2MB |
2MB |
2MB |
2MB |
2MB |
NONE |
NONE |
NONE |
|
12MB |
2MB |
2MB |
2MB |
2MB |
2MB |
2MB |
NONE |
NONE |
|
14MB |
2MB |
2MB |
2MB |
2MB |
2MB |
2MB |
2MB |
NONE |
|
16MB |
2MB |
2MB |
2MB |
2MB |
2MB |
2MB |
2MB |
2MB |
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Note: Location of Bank 0 is unidentified. Banks are filled with proprietary 2MB memory modules (NEC part # 13-260131-502-A). Either a proprietary system memory card or a proprietary memory bus expansion card may be installed at J8. The proprietary memory bus expansion card has four slots that may be populated by up to four 2MB expansion cards. |
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