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# 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
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| PS/2 mouse port | CN1 | Speaker | J4 |
|------------------+----------+-------------------+----------|
| External battery | J2 | Auxiliary | J5 |
| | | keyboard | |
| | | connector | |
|------------------+----------+-------------------+----------|
| 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 | SW2/1 | Off |
| | installed, set switch to 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 | SW2/4 | Off |
| | from fail safe timer disabled | | |
|---+-------------------------------------+-------+----------|
| | Non maskable interrupt generated | SW2/4 | On |
| | from fail safe timer enabled | | |
|---+-------------------------------------+-------+----------|
| » | 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 |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| 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 | On | On | On | On | On | On | On | On |
| first 2MB | | | | | | | | |
| boundary | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Setting |SW2/1|SW2/2|SW2/3|SW2/4|SW2/5|SW2/6|SW2/7|SW2/8|
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Locate 256KB| On | Off | On | On | On | On | On | On |
| at end of | | | | | | | | |
|second MB of| | | | | | | | |
| space. | | | | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | On | On | On | On | On | On | On | On |
| first 2MB | | | | | | | | |
| boundary | | | | | | | | |
| (board 1) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Set for | Off | On | On | On | On | On | On | Off |
| first 2MB | | | | | | | | |
| boundary | | | | | | | | |
| (board 2) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Setting |SW2/1|SW2/2|SW2/3|SW2/4|SW2/5|SW2/6|SW2/7|SW2/8|
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Locate 256KB| On | On | Off | On | On | On | On | On |
| at end of | | | | | | | | |
|second MB of| | | | | | | | |
| space. | | | | | | | | |
| (board 1) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Not the | Off | Off | Off | Off | Off | Off | Off | Off |
|first MB in | | | | | | | | |
| the system | | | | | | | | |
| (board 2) | | | | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | On | On | On | On | On | On | On | On |
| first 2MB | | | | | | | | |
| boundary | | | | | | | | |
| (board 1) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Set for | Off | On | On | On | On | On | On | Off |
| first 2MB | | | | | | | | |
| boundary | | | | | | | | |
| (board 2) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Set for | On | Off | On | On | On | On | On | Off |
| third 2MB | | | | | | | | |
| boundary | | | | | | | | |
| (board 3) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Setting |SW2/1|SW2/2|SW2/3|SW2/4|SW2/5|SW2/6|SW2/7|SW2/8|
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Locate 256KB| On | Off | Off | On | On | On | On | On |
| at end of | | | | | | | | |
|sixth MB of | | | | | | | | |
| space. | | | | | | | | |
| (board 1) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|All switches| Off | Off | Off | Off | Off | Off | Off | Off |
| off (board | | | | | | | | |
| 2) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|All switches| Off | Off | Off | Off | Off | Off | Off | Off |
| off (board | | | | | | | | |
| 3) | | | | | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | On | On | On | On | On | On | On | On |
| first 2MB | | | | | | | | |
| boundary | | | | | | | | |
| (board 1) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Set for | Off | On | On | On | On | On | On | Off |
| first 2MB | | | | | | | | |
| boundary | | | | | | | | |
| (board 2) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Set for | On | Off | On | On | On | On | On | Off |
| third 2MB | | | | | | | | |
| boundary | | | | | | | | |
| (board 3) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Set for | Off | Off | On | On | On | On | On | Off |
| third 2MB | | | | | | | | |
| boundary | | | | | | | | |
| (board 4) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|All switches| N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| off (board | | | | | | | | |
| 4) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
| Setting |SW2/1|SW2/2|SW2/3|SW2/4|SW2/5|SW2/6|SW2/7|SW2/8|
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|Locate 256KB| On | On | On | Off | On | On | On | On |
| at end of | | | | | | | | |
|eighth MB of| | | | | | | | |
| space. | | | | | | | | |
| (board 1) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|All switches| Off | Off | Off | Off | Off | Off | Off | Off |
| off (board | | | | | | | | |
| 2) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|All switches| Off | Off | Off | Off | Off | Off | Off | Off |
| off (board | | | | | | | | |
| 3) | | | | | | | | |
|------------+-----+-----+-----+-----+-----+-----+-----+-----|
|All switches| Off | Off | Off | Off | Off | Off | Off | Off |
| off (board | | | | | | | | |
| 4) | | | | | | | | |
+------------------------------------------------------------+