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# SIEMENS NIXDORF INFORMATIONSSYSTEME AG
S26361-D756-X
Processor 80486SX/80487SX/80486DX/80486DX2
Processor Speed 25/33/50(internal)/66(internal)MHz
Chip Set Unidentified
Video Chip Set Unidentified
Maximum Onboard 32MB
Memory
Maximum Video 1MB
Memory
Cache 64/128/256KB
BIOS Unidentified
Dimensions 330mm x 218mm
I/O Options Floppy drive interface, IDE interface,
parallel port, PS/2 mouse port, serial ports
(2), video feature connector, VGA port, riser
slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Front panel | CN1 | Serial port 2 | J20 |
| connector | | | |
|------------------+----------+-------------------+----------|
| Speaker | J13 | Parallel port | J21 |
|------------------+----------+-------------------+----------|
| PS/2 mouse port | J15 | Video feature | J23 |
| | | connector | |
|------------------+----------+-------------------+----------|
| IDE interface | J17 | VGA port | J24 |
|------------------+----------+-------------------+----------|
| Floppy drive | J18 | External battery | JP8 |
| interface | | | |
|------------------+----------+-------------------+----------|
| Serial port 1 | J19 | Riser slot | SL1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| » | Internal battery enabled | JP8 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Internal battery disabled (CMOS | JP8 | Pins 2 & 3 |
| | memory clear) | | closed |
|---+-----------------------------------+-------+------------|
| » | Monitor type select color | JP10 | Open |
|---+-----------------------------------+-------+------------|
| | Monitor type select monochrome | JP10 | Closed |
|---+-----------------------------------+-------+------------|
| » | PS/2 mouse IRQ12 enabled | JP11 | Closed |
|---+-----------------------------------+-------+------------|
| | PS/2 mouse IRQ12 disabled | JP11 | Open |
|---+-----------------------------------+-------+------------|
| » | On board video enabled | JP25 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | On board video disabled | JP25 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | None |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | None |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 |
|------------------+--------------------+--------------------|
| 128KB | (4) 32K x 8 | None |
|------------------+--------------------+--------------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 |
|------------------------------------------------------------|
| Note: The locations of banks 0 & 1 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE TAG CONFIGURATION |
|------------------------------------------------------------|
| Size | U48 | U49 | U50 |
|------------+---------------+---------------+---------------|
| 64KB | (1) 8K x 8 | None | (1) 16K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (1) 8K x 8 | None | (1) 16K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (1) 8K x 8 | (1) 8K x 8 | (1) 16K x 8 |
|------------------------------------------------------------|
| Note: The locations of U48, U49 & U50 are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP12 | JP13 | JP14 | JP15 | JP16 | JP17 |
|--------+-------+-------+--------+--------+--------+--------|
| None | 2 & 3 | 2 & 3 | Open | Open | Open | Open |
|--------+-------+-------+--------+--------+--------+--------|
| 64KB | 2 & 3 | 2 & 3 | Open | Open | Open | Open |
|--------+-------+-------+--------+--------+--------+--------|
| 128KB | 1 & 2 | 1 & 2 | Closed | Open | Open | Closed |
|--------+-------+-------+--------+--------+--------+--------|
| 256KB | 2 & 3 | 2 & 3 | Closed | Closed | Closed | Closed |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|--------------------+-------------------+-------------------|
| 512KB | 512KB | None |
|--------------------+-------------------+-------------------|
| 1MB | 512KB | 512KB |
|------------------------------------------------------------|
| Note: The chips sizes are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP5 | JP6 |
|--------------------+-------------------+-------------------|
| 25MHz | Closed | Open |
|--------------------+-------------------+-------------------|
| 33MHz | Open | Closed |
|--------------------+-------------------+-------------------|
| 50iMHz | Closed | Open |
|--------------------+-------------------+-------------------|
| 66iMHz | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP1 | JP2 | JP3 |
|----------+----------------+----------------+---------------|
| 80486SX | Open | Pins 1 & 2 | Open |
| | | closed | |
|----------+----------------+----------------+---------------|
| 80487SX | Pins 2 & 3 | Pins 1 & 2 | Pins 1 & 2 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| 80486DX | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed |
|----------+----------------+----------------+---------------|
| 80486DX2 | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed |
|------------------------------------------------------------|
| Note: If upgrade socket is filled, JP1 must be open. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note: The location of pin 1 on the jumpers and connectors |
| are unidentified. |
+------------------------------------------------------------+