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 |
|
|
|
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 |
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|
» |
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 |
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|
|
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 |
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|
|
Parity check disabled |
JP44 |
Closed |
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|
|
Notes: Location of pin 1s unverified. Location of JP44 unverified |
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|
DRAM CONFIGURATION |
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|
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 |