UNIDENTIFIED
J-286P SYSTEM BOARD
Processor | 80286 (exact location unknown) |
Processor Speed | 12/16/20/24MHz |
Chip Set | Suntac |
Max. Onboard DRAM | 5MB |
Cache | None |
BIOS | AMI |
Dimensions | 220mm x 220mm |
I/O Options | Floppy drive interface (on some models), IDE interface (on some models) |
NPU Options | 80287 (exact location unknown) |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Reset switch | J1 | Speaker | J4 |
Turbo switch | J2 | Power LED & keylock | J5 |
Turbo LED | J3 | External battery | JP9 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Factory configured - do not alter | JP1 | Open |
» | Factory configured - do not alter | JP2 | Open |
» | Floppy drive interface enabled (interface location unknown) | JP5 | Closed |
Floppy drive interface disabled | JP5 | Open | |
» | Monitor type select monochrome | JP12 | Open |
Monitor type select color | JP12 | Closed | |
» | Parity check enabled | JP13 | Closed |
Parity check disabled | JP13 | Open |
DRAM CONFIGURATION | ||||||
Size | Bank 0 | Bank 1 | Bank 2 | Parity 2 | Bank 3 | Parity 3 |
1MB | NONE | NONE | (4) 44256 | (4) 41256 | (4) 44256 | (4) 41256 |
1MB | (2) 256K x 9 | (2) 256K x 9 | NONE | NONE | NONE | NONE |
2MB | (2) 256K x 9 | (2) 256K x 9 | (4) 44256 | (4) 41256 | (4) 44256 | (4) 41256 |
2MB | (2) 1M x 9 | NONE | NONE | NONE | NONE | NONE |
3MB | (2) 1M x 9 | NONE | (4) 44256 | (4) 41256 | (4) 44256 | (4) 41256 |
4MB | (2) 1M x 9 | (2) 1M x 9 | NONE | NONE | NONE | NONE |
5MB | (2) 1M x 9 | (2) 1M x 9 | (4) 44256 | (4) 41256 | (4) 44256 | (4) 41256 |
DRAM JUMPER CONFIGURATION | ||||
Size | JP8 | JP9 | JP10 | JP11 |
1MB | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
1MB | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
2MB | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
2MB | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
3MB | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
4MB | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
5MB | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
IDE INTERFACE CONFIGURATION | ||
Setting | JP3 | JP4 |
Enabled | Closed | Open |
Disabled | Open | Closed |
Note: The location of the interface is unknown. Interface is an option and may not be present. |
CPU SPEED CONFIGURATION | ||
System speed | Bus speed | JP20 |
12MHz | 6MHz | pins 1 & 2 closed |
16MHz | 8MHz | pins 1 & 2 closed |
20MHz | 8MHz | pins 2 & 3 closed |
24MHz | 8MHz | pins 2 & 3 closed |