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 | |||