NCR CORPORATION
MODEL 3386-0XXX PC 920
|
Processor |
80386 |
|
Processor Speed |
20MHz |
|
Chip Set |
Unidentified |
|
Video Chip Set |
None |
|
Maximum Onboard Memory |
2MB (on external memory card) |
|
Maximum Video Memory |
None |
|
Cache |
None |
|
BIOS |
Unidentified |
|
Dimensions |
Unidentified |
|
I/O Options |
External memory card, PS/2 mouse port |
|
NPU Options |
80387/3167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
PS/2 mouse port |
CN1 |
Speaker |
J4 |
|
External battery |
J2 |
Auxiliary keyboard connector |
J5 |
|
Keylock |
J3 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
Monitor type select color |
SW1 |
On |
|
Monitor type select monochrome |
SW1 |
Off | |
|
|
NPU not installed (if Weitek NPU is installed, set switch to off) |
SW2/1 |
Off |
|
NPU installed |
SW2/1 |
On | |
|
|
PS/2 mouse disabled |
SW2/2 |
Off |
|
PS/2 mouse enabled |
SW2/2 |
On | |
|
|
Video ROM copied to RAM |
SW2/3 |
Off |
|
Video ROM not copied to RAM |
SW2/3 |
On | |
|
|
Non maskable interrupt generated from fail safe timer disabled |
SW2/4 |
Off |
|
Non maskable interrupt generated from fail safe timer enabled |
SW2/4 |
On | |
|
|
IRQ10 disabled |
SW2/5 |
Off |
|
IRQ10 enabled |
SW2/5 |
On | |
|
|
IRQ11 disabled |
SW2/6 |
Off |
|
IRQ11 enabled |
SW2/6 |
On | |
|
|
IRQ12 disabled |
SW2/7 |
Off |
|
IRQ12 enabled |
SW2/7 |
On | |
|
CPU SPEED SELECTION | |
|
Speed |
SW2/8 |
|
8MHz (auto speed select) |
Off |
|
20MHz (high speed select) |
On |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
Wait state select 0 wait states |
J1/JP1 |
Pins 1 & 2 closed | |
|
Wait state select 1 wait states |
J1/JP1 |
Pins 2 & 3 closed | |
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(36) 411000 |
None |
|
2MB |
(36) 411000 |
(36) 411000 |
|
Note: The location of banks 0 & 1 are unidentified. | ||
|
DRAM JUMPER CONFIGURATION | |
|
Size |
J2/JP2 |
|
1MB |
Pins 2 & 3, 5 & 6, 8 & 9 closed |
|
2MB |
Pins 1 & 2, 4 & 5, 7 & 8 closed |
|
DRAM SWITCH CONFIGURATION (ONE 2MB BOARD INSTALLED) | ||||||||
|
Setting |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
SW1/7 |
SW1/8 |
|
Set for first 2MB boundary |
On |
On |
On |
On |
On |
On |
On |
On |
|
Setting |
SW2/1 |
SW2/2 |
SW2/3 |
SW2/4 |
SW2/5 |
SW2/6 |
SW2/7 |
SW2/8 |
|
Locate 256KB at end of second MB of space. |
On |
Off |
On |
On |
On |
On |
On |
On |
|
DRAM SWITCH CONFIGURATION (TWO 2MB BOARDS INSTALLED) | ||||||||
|
Setting |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
SW1/7 |
SW1/8 |
|
Set for first 2MB boundary (board 1) |
On |
On |
On |
On |
On |
On |
On |
On |
|
Set for first 2MB boundary (board 2) |
Off |
On |
On |
On |
On |
On |
On |
Off |
|
Setting |
SW2/1 |
SW2/2 |
SW2/3 |
SW2/4 |
SW2/5 |
SW2/6 |
SW2/7 |
SW2/8 |
|
Locate 256KB at end of second MB of space. (board 1) |
On |
On |
Off |
On |
On |
On |
On |
On |
|
Not the first MB in the system (board 2) |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
|
DRAM SWITCH CONFIGURATION (THREE 2MB BOARDS INSTALLED) | ||||||||
|
Setting |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
SW1/7 |
SW1/8 |
|
Set for first 2MB boundary (board 1) |
On |
On |
On |
On |
On |
On |
On |
On |
|
Set for first 2MB boundary (board 2) |
Off |
On |
On |
On |
On |
On |
On |
Off |
|
Set for third 2MB boundary (board 3) |
On |
Off |
On |
On |
On |
On |
On |
Off |
|
Setting |
SW2/1 |
SW2/2 |
SW2/3 |
SW2/4 |
SW2/5 |
SW2/6 |
SW2/7 |
SW2/8 |
|
Locate 256KB at end of sixth MB of space. (board 1) |
On |
Off |
Off |
On |
On |
On |
On |
On |
|
All switches off (board 2) |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
|
All switches off (board 3) |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
|
DRAM SWITCH CONFIGURATION (FOUR 2MB BOARDS INSTALLED) | ||||||||
|
Setting |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
SW1/7 |
SW1/8 |
|
Set for first 2MB boundary (board 1) |
On |
On |
On |
On |
On |
On |
On |
On |
|
Set for first 2MB boundary (board 2) |
Off |
On |
On |
On |
On |
On |
On |
Off |
|
Set for third 2MB boundary (board 3) |
On |
Off |
On |
On |
On |
On |
On |
Off |
|
Set for third 2MB boundary (board 4) |
Off |
Off |
On |
On |
On |
On |
On |
Off |
|
All switches off (board 4) |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
|
Setting |
SW2/1 |
SW2/2 |
SW2/3 |
SW2/4 |
SW2/5 |
SW2/6 |
SW2/7 |
SW2/8 |
|
Locate 256KB at end of eighth MB of space. (board 1) |
On |
On |
On |
Off |
On |
On |
On |
On |
|
All switches off (board 2) |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
|
All switches off (board 3) |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
|
All switches off (board 4) |
Off |
Off |
Off |
Off |
Off |
Off |
Off |
Off |