UNIDENTIFIED
286-12/16/20
Processor |
80286 |
Processor Speed |
12/16/20MHz |
Chip Set |
Acer |
Max. Onboard DRAM |
4MB |
Cache |
None |
BIOS |
AMI |
Dimensions |
330mm x 218mm |
I/O Options |
None |
NPU Options |
80287 |
CONNECTIONS | |||
Purpose |
Location |
Purpose |
Location |
External battery |
J1 |
Reset switch |
CN3 |
Speaker |
CN1 |
Turbo switch |
CN4 |
Turbo LED |
CN2 |
Power LED & keylock |
CN5 |
USER CONFIGURABLE SETTINGS | |||
Function |
Jumper |
Position | |
Coprocessor synchronous with CPU |
J2 |
pins 2 & 3 closed | |
Coprocessor asynchronous with CPU (need extra OSC) |
J2 |
pins 1 & 2 closed | |
» |
8 bit BIOS enabled |
J3 |
Closed |
16 bit BIOS enabled |
J3 |
Open | |
» |
Bus speed select AT clock |
J4 |
Closed |
Bus speed select 1/2 CPU clock |
J4 |
Open | |
» |
Parity check enabled |
J5 |
Open |
Parity check disabled |
J5 |
Closed | |
» |
CMOS memory normal operation |
J7 |
Open |
CMOS memory clear |
J7 |
Closed | |
» |
Monitor type select monochrome |
J8 |
pins 1 & 2 closed |
Monitor type select color |
J8 |
pins 2 & 3 closed | |
» |
Internal battery enabled |
J9 |
pins 2 & 3 closed |
External battery enabled |
J9 |
pins 1 & 2 closed | |
Note:The exact location of jumper J7 is unidentified by the manufacturer. |
DRAM CONFIGURATION | ||||
Size |
Bank 0 |
Parity 0 |
Bank 1 |
Parity 1 |
512KB |
(4) 44256 |
(2) 41256 |
NONE |
NONE |
640KB |
(4) 44256 |
(2) 41256 |
(4) 4464 |
(2) 4164 |
640KB |
(2) 256K x 9 |
(2) 41256 |
(4) 4464 |
(2) 4164 |
1024KB |
(4) 44256 |
(2) 41256 |
(4) 44256 |
(2) 4164 |
1024KB |
(2) 256K x 9 |
NONE |
(2) 256K x 9 |
NONE |
2048KB |
(2) 1M x 9 |
NONE |
NONE |
NONE |
4096KB |
(2) 1M x 9 |
NONE |
(2) 1M x 9 |
NONE |