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# ABC COMPUTER COMPANY, LTD.
COMPACT 286 VER. 2
Processor 80286
Processor Speed 20MHz
Chip Set C & T
Max. Onboard DRAM 8MB
Cache None
BIOS AMI
Dimensions 330mm x 218mm
I/O Options None
NPU Options 80287
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Reset switch | E5 | Speaker | J19 |
|------------------+----------+-------------------+----------|
| MIPS counter | E7 | Power LED & | J21 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| External battery | J17 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+---------+------------|
| » | NPU speed select 10MHz | E1 & E2 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+---------+------------|
| | NPU speed select slow | E1 & E2 | pins 2 & 3 |
| | | | closed |
|---+---------------------------------+---------+------------|
| » | BIOS type select 27128 | E3 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+---------+------------|
| | BIOS type select 27256 | E3 | pins 2 & 3 |
| | | | closed |
|---+---------------------------------+---------+------------|
| » | CMOS memory normal operation | E4 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+---------+------------|
| | CMOS memory clear | E4 | pins 2 & 3 |
| | | | closed |
|---+---------------------------------+---------+------------|
| » | Reset enabled through hardware | E6 | pins 1 & 2 |
| | only | | closed |
|---+---------------------------------+---------+------------|
| | Reset enabled through hardware | E6 | pins 2 & 3 |
| | and keyboard | | closed |
|---+---------------------------------+---------+------------|
| » | Monitor type select monochrome | SW1 | pins 1 & 2 |
| | | | closed |
|---+---------------------------------+---------+------------|
| | Monitor type select color | SW1 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|--------+------------+------------+------------+------------|
| 512KB | (18) 41256 | NONE | NONE | NONE |
|--------+------------+------------+------------+------------|
| 640KB | (18) 41256 | (18) 4164 | NONE | NONE |
|--------+------------+------------+------------+------------|
| 1MB | (18) 41256 | (18) 41256 | NONE | NONE |
|--------+------------+------------+------------+------------|
| 1.5MB | (18) 41256 | (18) 41256 | (18) 41256 | NONE |
|--------+------------+------------+------------+------------|
| 1.64MB | (18) 41256 | (18) 4164 | (18) 41256 | (18) 41256 |
|--------+------------+------------+------------+------------|
| 2MB | (18) 41256 | (18) 41256 | (18) 41256 | (18) 41256 |
|--------+------------+------------+------------+------------|
| 2MB | (18) | NONE | NONE | NONE |
| | 411000 | | | |
|--------+------------+------------+------------+------------|
| 3MB | (18) 41256 | (18) 41256 | (18) | NONE |
| | | | 411000 | |
|--------+------------+------------+------------+------------|
| 4MB | (18) | (18) | NONE | NONE |
| | 411000 | 411000 | | |
|--------+------------+------------+------------+------------|
| 4.64MB | (18) 41256 | (18) 4164 | (18) | (18) |
| | | | 411000 | 411000 |
|--------+------------+------------+------------+------------|
| 5MB | (18) 41256 | (18) 41256 | (18) | (18) |
| | | | 411000 | 411000 |
|--------+------------+------------+------------+------------|
| 6MB | (18) | (18) | (18) | NONE |
| | 411000 | 411000 | 411000 | |
|--------+------------+------------+------------+------------|
| 8MB | (18) | (18) | (18) | (18) |
| | 411000 | 411000 | 411000 | 411000 |
|------------------------------------------------------------|
| Note:Locations of banks within the DRAM area are unknown. |
+------------------------------------------------------------+