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# SAMSUNG ELECTRONICS, INC.
SD 550
Processor 80286 (exact location unidentified)
Processor Speed 12MHz
Chip Set Unidentified
Maximum Onboard 1MB
Memory
Cache None
BIOS Award
Dimensions 406mm x 406mm
I/O Options Floppy drive interface, parallel port, serial
ports (2)
NPU Options 80287 (exact location unidentified)
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|--------------------+-------+-----------------------+-------|
| Serial port | CN11 | Power LED & keylock | J13 |
|--------------------+-------+-----------------------+-------|
| Serial port | CN12 | Speaker | J14 |
|--------------------+-------+-----------------------+-------|
| Parallel port | CN13 | External battery | J15 |
|--------------------+-------+-----------------------+-------|
| Keyboard connector | J11 | Floppy drive | J17 |
| | | interface | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|---------------------------------------+-------+------------|
| ยป | Jumper information unavailable | J12 | N/A |
|---+-----------------------------------+-------+------------|
| | Parallel port enabled | JP11 | Closed |
|---+-----------------------------------+-------+------------|
| | Parallel port disabled | JP11 | Open |
|---+-----------------------------------+-------+------------|
| | Floppy drive interface enabled | JP12 | Closed |
|---+-----------------------------------+-------+------------|
| | Floppy drive interface disabled | JP12 | Open |
|---+-----------------------------------+-------+------------|
| | Serial port 1 enabled | JP13 | Closed |
|---+-----------------------------------+-------+------------|
| | Serial port 1 disabled | JP13 | Open |
|---+-----------------------------------+-------+------------|
| | Serial port 2 enabled | JP14 | Closed |
|---+-----------------------------------+-------+------------|
| | Serial port 2 disabled | JP14 | Open |
|---+-----------------------------------+-------+------------|
| | BIOS type select 27256 | JP15 | Closed |
|---+-----------------------------------+-------+------------|
| | BIOS type select 27128 | JP15 | Open |
|---+-----------------------------------+-------+------------|
| | NPU speed select 16MHz | JP17 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | NPU speed select 25MHz | JP17 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Drive type select dual speed | JP19 | Closed |
|---+-----------------------------------+-------+------------|
| | Drive type select single speed | JP19 | Open |
|---+-----------------------------------+-------+------------|
| | Precomp value select 187ns | JP20 | Closed |
|---+-----------------------------------+-------+------------|
| | Precomp value select 125ns | JP20 | Open |
|---+-----------------------------------+-------+------------|
| | Floppy drive address select | JP22 | Closed |
| | secondary | | |
|---+-----------------------------------+-------+------------|
| | Floppy drive address select | JP22 | Open |
| | primary | | |
|---+-----------------------------------+-------+------------|
| | Monitor type select color | SW10 | Up |
|---+-----------------------------------+-------+------------|
| | Monitor type select monochrome | SW10 | Down |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|--------+------------+------------+------------+------------|
| 640KB | (9) 41256 | (9) 41256 | (9) 4164 | (9) 4164 |
|--------+------------+------------+------------+------------|
| 1MB | (9) 41256 | (9) 41256 | (9) 41256 | (9) 41256 |
|------------------------------------------------------------|
| Note: The orientation of the banks is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER |
|------------------------------------------------------------|
| Size | JP16 |
|-----------------------------+------------------------------|
| 640KB | Closed |
|-----------------------------+------------------------------|
| 1MB | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM WAIT STATE |
|------------------------------------------------------------|
| Setting | JP21 |
|-------------------------------+----------------------------|
| 0 wait states | Closed |
|-------------------------------+----------------------------|
| 1 wait state | Open |
+------------------------------------------------------------+