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# NCR CORPORATION
PC916SX
Processor 80386SX
Speed 16MHz
Chip Set Unidentified
Max. Onboard DRAM 1MB
BIOS Unidentified
Cache None
Dimensions 290mm x 106mm
I/O Options External memory card slot
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+-------------------+-----------|
| External | J2 | Keyboard | J5 |
| Battery | | connector | |
|-----------------+----------+-------------------+-----------|
| Turbo LEDs & | J3 | Proprietary | P11 & P12 |
| keylock | | external memory | |
| | | port | |
|-----------------+----------+-------------------+-----------|
| Speaker & | J4 | | |
| volume control | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS ||
|-----------------------------------------------------------||
| Function | Jumper/Switch | Position ||
|-------------------------------+---------------+-----------||
| » | Pipeline mode disabled | JP3-I/JP3-II | pins 2 & ||
| | | | 3 closed ||
|---+---------------------------+---------------+-----------||
| | Pipeline mode enabled | JP3-I/JP3-II | pins 1 & ||
| | | | 2 closed ||
|---+---------------------------+---------------+-----------||
| » | Monitor type select color | S1 | pins 1 & ||
| | | | 2 closed ||
|---+---------------------------+---------------+-----------||
| | Monitor type select | S1 | pins 2 & ||
| | monochrome | | 3 closed ||
|---+---------------------------+---------------+-----------||
| » | Power-on speed select | S2 | pins 1 & ||
| | fast | | 2 closed ||
|---+---------------------------+---------------+-----------||
| » | Power-on speed select | S2 | pins 2 & ||
| | slow | | 3 closed ||
|---+---------------------------+---------------+-----------||
| » | DRAM speed select slow | SW3/1 | Off ||
|---+---------------------------+---------------+-----------||
| | DRAM speed select fast | SW3/1 | On ||
|---+---------------------------+---------------+-----------||
| » | DMA speed select | SW3/2 | Off ||
| | automatic | | ||
|---+---------------------------+---------------+-----------||
| | DMA speed select 8MHz | SW3/2 | On ||
|---+---------------------------+---------------+-----------||
| » | Memory 0-512KB enabled | SW3/3 | Off ||
|---+---------------------------+---------------+-----------||
| | Memory 0-256KB enabled, | SW3/3 | On ||
| | 256-512KB disabled | | ||
|---+---------------------------+---------------+-----------||
| » | Memory 512-1024KB enabled | SW3/4 | Off ||
|---+---------------------------+---------------+-----------||
| | Memory 512-1024KB | SW34 | On ||
| | disabled | | ||
|---+--------------------------------------------------------|
| | Notes:JP3-I is found on Type MMI mainboard, JP3-II is |
| | found on Type MMII mainboard. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 |
|----------------------------+-------------------------------|
| 1MB | (8) 44256 |
|------------------------------------------------------------|
| Note:Memory chip sizes and locations are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM - I/O SPEED CONFIGURATION |
|------------------------------------------------------------|
| IOW, MEMW, | IOR | JP1 | JP2 |
| MEMR | | | |
|----------------+--------+-----------------+----------------|
| » | 500ns | 750ns | pins 2 & 3 | pins 1 & 2 |
| | | | closed | closed |
|-----+----------+--------+-----------------+----------------|
| | 250ns | 500ns | pins 2 & 3 | pins 2 & 3 |
| | | | closed | closed |
|-----+----------+--------+-----------------+----------------|
| | 750ns | 1000ns | pins 1 & 2 | pins 2 & 3 |
| | | | closed | closed |
|-----+----------+--------+-----------------+----------------|
| | 1000ns | 1250ns | pins 1 & 2 | pins 1 & 2 |
| | | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM MAPPING CONFIGURATION |
|------------------------------------------------------------|
| Extended | Mapping area | SW3/5 | SW3/6 | SW3/7 | SW3/8 |
| memory | | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 0MB | 100000 - | Off | On | On | On |
| | 160000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 1MB | 200000 - | On | Off | On | On |
| | 260000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 2MB | 300000 - | Off | Off | On | On |
| | 360000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 3MB | 400000 - | On | On | Off | On |
| | 460000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 4MB | 500000 - | Off | On | Off | On |
| | 560000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 5MB | 600000 - | On | Off | Off | On |
| | 660000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 6MB | 700000 - | Off | Off | Off | On |
| | 760000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 7MB | 800000 - | On | On | On | Off |
| | 860000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 8MB | 900000 - | Off | On | On | Off |
| | 960000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 9MB | A00000 - | On | Off | On | Off |
| | A60000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 10MB | B00000 - | Off | Off | On | Off |
| | B60000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 11MB | C00000 - | On | On | Off | Off |
| | C60000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 12MB | D00000 D60000h | Off | On | Off | Off |
|----------+-----------------+-------+-------+-------+-------|
| 13MB | E00000 - | On | Off | Off | Off |
| | E60000h | | | | |
|----------+-----------------+-------+-------+-------+-------|
| 14MB | F00000 - | Off | Off | Off | Off |
| | F60000h | | | | |
+------------------------------------------------------------+