UNIDENTIFIED
SEAT 286
Processor | 80286 |
Processor Speed | 12/16/20MHz |
Chip Set | G-2 |
Max. Onboard DRAM | 8MB (4MB on external memory card) |
Cache | None |
BIOS | Unidentified |
Dimensions | 330mm x 218mm |
I/O Options | 16-bit external memory card |
NPU Options | 80287 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Optional keyboard connector | J1 | Turbo LED | J11 |
External battery | J4 | Reset switch | J13 |
Power LED & keylock | J10 | Speaker | J15 |
16-bit external memory card | SL1 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
» | Battery select 3.6v internal | J2 | Closed |
Battery select 6V external | J2 | Open | |
» | Power good signal detect from board | J3 | Pins 1 & 2 closed |
Power good signal detect from power supply | J3 | Pins 2 & 3 closed | |
» | Monitor type select color | J5 | Closed |
Monitor type select monochrome | J5 | Open | |
» | BIOS type select 27256 | J6 | Pins 2 & 3 closed |
BIOS type select 27128 | J6 | Pins 1 & 2 closed | |
» | Factory configured - do not alter | J7 | N/A |
» | Factory configured - do not alter | J8 | N/A |
» | Parity check disabled | J9 | Pins 2 & 3 closed |
Parity check enabled | J9 | Pins 1 & 2 closed | |
» | I/O speed select half | J12/1 | On |
I/O speed select full | J12/1 | Off | |
» | Extended 384K RAM enabled | J12/4 | Off |
Extended 384K RAM disabled | J12/4 | On | |
» | DRAM type select 1M x 1 | J12/6 | On |
DRAM type select 256K x 4 | J12/6 | Off | |
» | NPU asynchronous with CPU | J14 | Pins 2 & 3 closed |
NPU synchronous with CPU | J14 | Pins 1 & 2 closed | |
» | Turbo enabled | J16 | Open |
Turbo disabled | J16 | Closed |
DRAM CONFIGURATION | |||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | Bank 4 |
512KB | (4) 44256 | NONE | NONE | NONE | NONE |
640KB | (4) 44256 | NONE | (4) 4464 | NONE | NONE |
1MB | (4) 44256 | (4) 44256 | NONE | NONE | NONE |
2MB | NONE | NONE | NONE | (16) 421000 | NONE |
4MB | NONE | NONE | NONE | (16) 421000 | (16) 421000 |
PARITY CONFIGURATION | ||||
Size | P0 | P1 | P2 | P3 |
512KB | (2) 41256 | NONE | NONE | NONE |
640KB | NONE | NONE | NONE | NONE |
1MB | (2) 41256 | (2) 41256 | NONE | NONE |
2MB | NONE | NONE | (2) 421000 | NONE |
4MB | NONE | NONE | (2) 421000 | (2) 421000 |
DRAM SWITCH CONFIGURATION | |||
Size | J12/2 | J12/3 | J12/5 |
512KB | Off | Off | Off |
640KB | Off | Off | On |
1MB | On | Off | Off |
2MB | Off | Off | Off |
4MB | On | Off | Off |
8MB | On | On | Off |
Note: J12/4 & J12/5 must be ON for 640KB |