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  | |||