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# NCR CORPORATION
PC916/PC920
Processor 80386DX
Speed 16/20MHz
Chip Set Unidentified
Max. Onboard DRAM None
BIOS Unidentified
Cache None
Dimensions 290mm x 106mm
I/O Options Proprietary external memory bus
NPU Options 80287/80387
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+-------------------+-----------|
| External | J2 | Keyboard plug | J5 |
| Battery | | | |
|-----------------+----------+-------------------+-----------|
| Power LEDs & | J3 | Proprietary | S1 |
| keylock | | external memory | |
| | | bus | |
|-----------------+----------+-------------------+-----------|
| Speaker & | J4 | EPROM expansion | U10 & U28 |
| volume control | | ROMs | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS ||
|-----------------------------------------------------------||
| Function | Jumper/Switch | Position ||
|-------------------------------+---------------+-----------||
| » | Factory configured - do | J1 | N/A ||
| | not alter. | | ||
|---+---------------------------+---------------+-----------||
| » | Power good signal detect | JP1 | Off ||
| | from power supply | | ||
|---+---------------------------+---------------+-----------||
| | Power good signal detect | JP1 | On ||
| | from board | | ||
|---+---------------------------+---------------+-----------||
| | DMA speed select 4MHz | JP2 | Off ||
|---+---------------------------+---------------+-----------||
| | DMA speed select 8MHz | JP2 | On ||
|---+---------------------------+---------------+-----------||
| » | Monitor type select color | SW1 | pins 1 & ||
| | | | 2 closed ||
|---+---------------------------+---------------+-----------||
| | Monitor type select | SW1 | pins 2 & ||
| | monochrome | | 3 closed ||
|---+---------------------------+---------------+-----------||
| » | NPU 80387 disabled | SW2/1 | Off ||
|---+---------------------------+---------------+-----------||
| | NPU 80387 enabled | SW2/1 | On ||
|---+---------------------------+---------------+-----------||
| » | NPU 80287 disabled | SW2/2 | Off ||
| | (Version A) | | ||
|---+---------------------------+---------------+-----------||
| | NPU 80287 enabled | SW2/2 | On ||
| | (Version A) | | ||
|---+---------------------------+---------------+-----------||
| » | Factory configured - do | SW2/2 | Off ||
| | not alter (Version B) | | ||
|---+---------------------------+---------------+-----------||
| » | DMA page register mode | SW2/3 | Off ||
| | select extended (Version | | ||
| | A) | | ||
|---+---------------------------+---------------+-----------||
| | DMA page register mode | SW2/3 | On ||
| | select PC8-standard | | ||
| | (Version A) | | ||
|---+---------------------------+---------------+-----------||
| » | Video ROM caching enabled | SW2/3 | Off ||
| | (Version B) | | ||
|---+---------------------------+---------------+-----------||
| | Video ROM caching | SW2/3 | On ||
| | disabled (Version B) | | ||
|---+---------------------------+---------------+-----------||
| » | Fail-safe timer | SW2/4 | Off ||
| | non-maskable interrupt | | ||
| | disabled | | ||
|---+---------------------------+---------------+-----------||
| | Fail-safe timer | SW2/4 | On ||
| | non-maskable interrupt | | ||
| | enabled | | ||
|---+---------------------------+---------------+-----------||
| » | IRQ 10 disabled | SW2/5 | Off ||
|---+---------------------------+---------------+-----------||
| | IRQ 10 enabled | SW2/5 | On ||
|---+---------------------------+---------------+-----------||
| » | IRQ 11 disabled | SW2/6 | Off ||
|---+---------------------------+---------------+-----------||
| | IRQ 11 enabled | SW2/6 | On ||
|---+---------------------------+---------------+-----------||
| » | IRQ 12 disabled | SW2/7 | Off ||
|---+---------------------------+---------------+-----------||
| | IRQ 12 enabled | SW2/7 | On ||
|---+---------------------------+---------------+-----------||
| » | CPU speed when accessing | SW2/8 | On ||
| | floppy disk select 16Mhz | | ||
|---+---------------------------+---------------+-----------||
| | CPU speed when accessing | SW2/8 | Off ||
| | floppy disk select 8Mhz | | ||
|---+---------------------------+---------------+-----------||
| » | Factory configured - do | VC1 | N/A ||
| | not alter (Version A) | | ||
|---+---------------------------+---------------+-----------||
| » | Factory configured - do | VC2 | N/A ||
| | not alter (Version A) | | ||
|---+--------------------------------------------------------|
| | Notes:If JP2 is not present on main board, JP2 is |
| | factory set to open, if JP2 is present then JP2 is |
| | |
| | factory set to closed and should not be altered. |
| | |
| | Version B, main boards with part numbers of |
| | 150-0006935 and later, do not support the 80287. |
| | |
| | Location of 80287 NPU is unverified. |
| | |
| | On Version A main boards with part numbers of |
| | 150-0004426 or later, SW2/switch 3 controls |
| | |
| | video ROM caching and DMA is always in extended mode. |
| | |
| | If using a third-party video card, video ROM caching |
| | should be disabled. |
| | |
| | Variable capacitors VC1 and VC2 are present only on |
| | Version A main boards. |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| EXTERNAL MEMORY CARD CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|---------------+------------------------+-------------------|
| 1MB | (36) 41256 | NONE |
|---------------+------------------------+-------------------|
| 2MB | (36) 41256 | (36) 41256 |
|------------------------------------------------------------|
| Note:Location of banks 0 & 1 unidentified. Memory chips |
| are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTERNAL MEMORY CARD JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J2 |
|----------------------+-------------------------------------|
| 1MB | pins 2 & 3, 5 & 6, and 8 & 9 closed |
|----------------------+-------------------------------------|
| 2MB | pins 1 & 2, 4 & 5, and 7 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTERNAL MEMORY CARD SWITCH CONFIGURATION |
|------------------------------------------------------------|
|Size |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |SW1/6 |SW1/7 |SW1/8|
|-----+------+------+------+------+------+------+------+-----|
| 1MB | On | On | On | On | On | On | On | On |
|-----+------+------+------+------+------+------+------+-----|
| 2MB | On | On | On | On | On | On | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTERNAL MEMORY CARD SWITCH CONFIGURATION (CON’T) |
|------------------------------------------------------------|
|Size |SW2/1 |SW2/2 |SW2/3 |SW2/4 |SW2/5 |SW2/6 |SW2/7 |SW2/8|
|-----+------+------+------+------+------+------+------+-----|
| 1MB | Off | On | On | On | On | On | On | On |
|-----+------+------+------+------+------+------+------+-----|
| 2MB | On | Off | On | On | On | On | On | On |
+------------------------------------------------------------+