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# MANDAX COMPUTER, INC.
286 MAINBOARD
Processor 80286
Processor Speed 6/12MHz
Chip Set Unknown
Max. Onboard DRAM 4MB
SRAM Cache None
BIOS AMI
Dimensions 330.2mm x 218.4mm
I/O Options None
NPU Options 80287
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------------+----------+--------------+----------|
| Digital CPU speed | J1 | Speaker | JP7 |
| display | | | |
|-----------------------+----------+--------------+----------|
| External battery | J15 | Turbo LED | JP10 |
|-----------------------+----------+--------------+----------|
| Power LED & keylock | JP4 | Reset switch | JP11 |
|-----------------------+----------+--------------+----------|
| Turbo switch | JP5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | Monitor type select | JP1 | pins 1 & 2 |
| | monochrome | | closed |
|---+---------------------------+---------------+------------|
| | Monitor type select color | JP1 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | NPU disabled | JP2 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | NPU enabled | JP2 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | JP3 | closed |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | RTC type select alkaline | JP6 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | RTC type select lithium | JP6 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | I/O speed select 6MHz | JP8 | open |
|---+---------------------------+---------------+------------|
| | I/O speed select | JP8 | closed |
| | synchronous with CPU | | |
| | clock | | |
|---+---------------------------+---------------+------------|
| » | Wait states select | JP9 | pins 1 & 2 |
| | switchable at keyboard | | closed |
|---+---------------------------+---------------+------------|
| | Wait state select one | JP9 | open |
|---+---------------------------+---------------+------------|
| | Wait states select zero | JP9 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | BIOS type select 27256 | JP12 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | BIOS type select 27512 | JP12 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Monitor type select | SW1/switch 1 | open |
| | monochrome | | |
|---+---------------------------+---------------+------------|
| | Monitor type select color | SW1/switch 1 | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
|Size | Bank 0 | Bank 1 |SW1/switch|SW1/switch|SW1/switch|
| | | | 2 | 3 | 4 |
|-----+----------+----------+----------+----------+----------|
|512KB|(18) 41256| NONE | closed | closed | open |
|-----+----------+----------+----------+----------+----------|
|640KB|(18) 41256|(18) 4164 | closed | open | closed |
|-----+----------+----------+----------+----------+----------|
| 1MB |(18) 41256|(18) 41256| closed | open | open |
|-----+----------+----------+----------+----------+----------|
| 2MB | (18) | NONE | open | open | closed |
| | 411000 | | | | |
|-----+----------+----------+----------+----------+----------|
| 4MB | (18) | (18) | open | open | open |
| | 411000 | 411000 | | | |
+------------------------------------------------------------+