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) |
Dimensions | 330mm x 218mm |
I/O Options | Proprietary serial/parallel card, keyboard/Bus mouse interface, floppy drive interface, proprietary system memory bus |
NPU Options | 80387/3167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Proprietary system memory bus | J8 | Floppy drive interface | P7 |
Speaker | P1 | Power supply | P8 |
Keyboard/Bus mouse interface | P2 | Drive power supply | P9 |
External battery | P3 | Proprietary serial/parallel card | P10 |
Power LED & Turbo LED | P6 | Auxiliary drive power supply | P12 |
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. |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
» | RDY signal from DODA select DMY RDY | 11B2 | pins 1 & 2 closed |
| RDY signal from DODA select BRDY | 11B2 | pins 2 & 3 closed |
» | Factory configured - do not alter | 18F1 | Open |
» | EISA memory write speed select 0 wait states | 18F2 | Closed |
| EISA memory write speed select 1 wait state | 18F2 | Open |
» | CPU self-test enabled | 21D1 & 4D1 | pins 1 & 2 closed |
| CPU self-test enabled | 21D1 & 4D1 | pins 2 & 3 closed |
» | Floppy interface transfer rate 500/300/250/150/125KB | 2D1 | pins 1 & 2 closed |
| Floppy interface transfer rate 500/300/250/150KB | 2D1 | pins 2 & 3 closed |
» | Reset enabled | 2J1 | Open |
| Reset disabled | 2J1 | Closed |
» | Test mode disabled | 2N2 | Open |
| Test mode enabled | 2N2 | Closed |
» | Password enabled | 5J2 | pins 1 & 2 closed |
| Password disabled | 5J2 | pins 2 & 3 closed |
» | A20 gate output select keyboard controller | 5J3 | pins 1 & 2 closed |
| A20 gate output select PAL (Novell workaround) | 5J3 | pins 2 & 3 closed |
» | Keyboard controller W/R select PAL (Novell workaround) | 5K3 | pins 1 & 2 closed |
| Keyboard controller W/R select normal XIOWT | 5K3 | pins 2 & 3 closed |
» | Keyboard controller input select 12HMz | 5K4 | pins 1 & 2 closed |
| Keyboard controller input select 8.33HMz | 5K4 | pins 2 & 3 closed |
» | STBY signal for RTC select PWREN -0 | 6K3 | pins 1 & 2 closed |
| STBY signal for RTC select PWREN +0 | 6K3 | pins 2 & 3 closed |
» | ROM test mode (looping) disabled | 8M2 | Open |
| ROM test mode (looping) enabled | 8M2 | Closed |
» | Factory configured - do not alter | 9E1 | pins 2 & 3 closed |
» | Factory configured - do not alter | 9E2 | pins 2 & 3 closed |
» | Monitor type select color | SW1/1 | On |
| Monitor type select monochrome | SW1/1 | Off |
» | Floppy drive interface address select primary (drive A) | SW1/2 | Off |
| Floppy drive interface address select secondary (drive B) | SW1/2 | On |
» | Floppy drive interface enabled | SW1/3 | On |
| Floppy drive interface disabled | SW1/3 | Off |
USER CONFIGURABLE SETTINGS (CON'T) | ||||||
Function | Switch | Position | ||||
» | Serial port (COM2) enabled | SW1/4 | On | |||
| Serial port (COM2) disabled | SW1/4 | Off | |||
» | Serial port (COM1) enabled | SW1/5 | On | |||
| Serial port (COM1) disabled | SW1/5 | Off | |||
» | Parallel port enabled | SW1/6 | On | |||
| Parallel port disabled | SW1/6 | Off | |||
» | NPU enabled | SW1/7 | On | |||
| NPU disabled | SW1/7 | Off | |||
» | Bus mouse enabled | SW1/8 | On | |||
| Bus mouse disabled | SW1/8 | Off | |||
» | Base memory size select 640KB | SW1/9 | On | |||
| Base memory size select 512KB | SW1/9 | Off | |||
» | Factory configured - do not alter | SW1/10 | Off | |||
| Notes: Serial parallel ports are located on the proprietary serial/parallel card. |
MEMORY READ SPEED CONFIGURATION | ||
Wait states | 18F3 | 19F1 |
0 | Closed | Closed |
1 | Open | Closed |
2 | Closed | Open |
3 | Open | Open |
SYSTEM MEMORY CARD (G8FHW)
DRAM CONFIGURATION | ||||||||
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 |
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. |