286 MAIN BOARD (DIP VERSION) Motherboard Settings and Configuration
UNIDENTIFIED
286 MAIN BOARD (DIP VERSION)
Processor | 80286 |
Processor Speed | 12MHz |
Chip Set | Unknown |
Max. Onboard DRAM | 4MB |
Cache | None |
BIOS | Award |
Dimensions | 330mm x 218mm |
I/O Options | None |
NPU Options | 80287 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Power LED & keylock | J1 | Turbo switch | J4 |
Speaker | J2 | Turbo LED | J5 |
Reset switch | J3 |
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USER CONFIGURABLE SETTINGS | ||||||
Function | Jumper | Position | ||||
| BIOS type select 27128 | JP1 | pins 1 & 2 closed | |||
| BIOS type select 27256 | JP1 | pins 2 & 3 closed | |||
» | Monitor type select color | JP2 | Closed | |||
| Monitor type select monochrome | JP2 | Open | |||
» | Factory configured - DRAM access speed 12MHz | JP5 | pins 2 & 3 closed | |||
| Invalid setting | JP5 | pins 1 & 2 closed | |||
» | NPU speed select ³ 8MHz | JP13 | pins 1 & 2 closed | |||
| NPU speed select £ 6MHz | JP13 | pins 2 & 3 closed | |||
» | Bus speed select fast | JP15 | Closed | |||
| Bus speed select slow | JP15 | Open | |||
» | Early address latch enabled | JP16 | Open | |||
| Early address latch disabled | JP16 | Closed | |||
» | DRAM select 0 wait states | JP17 | Closed | |||
| DRAM select 1 wait state | JP17 | Open | |||
» | Parity check enabled | JP44 | Open | |||
| Parity check disabled | JP44 | Closed | |||
| Notes: Location of pin 1s unverified. Location of JP44 unverified | |||||
DRAM CONFIGURATION | ||||||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | Bank 4 | P0 | P1 | JP4 |
512KB | (16) 41256 | NONE | NONE | NONE | NONE | (2) 41256 | NONE | closed |
512KB | NONE | (4) 44256 | NONE | NONE | NONE | (2) 41256 | NONE | closed |
640KB | (16) 41256 | (4) 4464 | NONE | NONE | NONE | (2) 41256 | (2) 4164 | closed |
640KB | NONE | (4) 44256 | NONE | (4) 4464 | NONE | (2) 41256 | (2) 4164 | closed |
640KB | (16) 41256 | NONE | (16) 4164 | NONE | NONE | (2) 41256 | (2) 4164 | closed |
640KB | NONE | (4) 44256 | (16) 4164 | NONE | NONE | (2) 41256 | (2) 4164 | closed |
1MB | (16) 41256 | NONE | (16) 41256 | NONE | NONE | (2) 41256 | (2) 41256 | closed |
1MB | NONE | (4) 44256 | NONE | NONE | (4) 44256 | (2) 41256 | (2) 41256 | closed |
1MB | (16) 41256 | NONE | NONE | NONE | (4) 44256 | (2) 41256 | (2) 41256 | closed |
1MB | NONE | (4) 44256 | (16) 41256 | NONE | NONE | (2) 41256 | (2) 41256 | closed |
2MB | (16) 411000 | NONE | NONE | NONE | NONE | (2) 411000 | NONE | open |
2.128MB | (16) 411000 | NONE | (16) 4164 | NONE | NONE | (2) 411000 | (2) 4164 | open |
2.5MB | (16) 411000 | NONE | (16) 41256 | NONE | NONE | (2) 411000 | (2) 41256 | open |
4MB | (16) 411000 | NONE | (16) 411000 | NONE | NONE | (2) 411000 | (2) 411000 | open |
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