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 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External Battery |
J2 |
Keyboard plug |
J5 |
|
Power LEDs & keylock |
J3 |
Proprietary external memory bus |
S1 |
|
Speaker & volume control |
J4 |
EPROM expansion ROMs |
U10 & U28 |
|
USER CONFIGURABLE SETTINGS | ||||
|
Function |
Jumper/Switch |
Position | ||
|
Factory configured - do not alter. |
J1 |
N/A | ||
|
Power good signal detect from power supply |
JP1 |
Off | ||
|
Power good signal detect from board |
JP1 |
On | ||
|
DMA speed select 4MHz |
JP2 |
Off | ||
|
DMA speed select 8MHz |
JP2 |
On | ||
|
Monitor type select color |
SW1 |
pins 1 & 2 closed | ||
|
Monitor type select monochrome |
SW1 |
pins 2 & 3 closed | ||
|
NPU 80387 disabled |
SW2/1 |
Off | ||
|
NPU 80387 enabled |
SW2/1 |
On | ||
|
NPU 80287 disabled (Version A) |
SW2/2 |
Off | ||
|
NPU 80287 enabled (Version A) |
SW2/2 |
On | ||
|
Factory configured - do not alter (Version B) |
SW2/2 |
Off | ||
|
DMA page register mode select extended (Version A) |
SW2/3 |
Off | ||
|
DMA page register mode select PC8-standard (Version A) |
SW2/3 |
On | ||
|
Video ROM caching enabled (Version B) |
SW2/3 |
Off | ||
|
Video ROM caching disabled (Version B) |
SW2/3 |
On | ||
|
Fail-safe timer non-maskable interrupt disabled |
SW2/4 |
Off | ||
|
Fail-safe timer non-maskable interrupt enabled |
SW2/4 |
On | ||
|
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 floppy disk select 16Mhz |
SW2/8 |
On | ||
|
CPU speed when accessing floppy disk select 8Mhz |
SW2/8 |
Off | ||
|
Factory configured - do not alter (Version A) |
VC1 |
N/A | ||
|
Factory configured - do not alter (Version A) |
VC2 |
N/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. | ||||
|
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 (CONT) | ||||||||
|
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 |