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# YOUTH KEEP ENTERPRISES, LTD.
502 386DX
Processor 80386DX
Processor Speed 33MHz
Chip Set Unidentified
Max. Onboard DRAM 8MB
Cache 64/256KB
BIOS Unidentified
Dimensions 355mm x 304mm
I/O Options 32-bit external memory card slot
NPU Options 80387/3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Power LED & | J1 | Turbo LED | J5 |
| keylock | | | |
|---------------+----------+----------------------+----------|
| Speaker | J2 | External battery | J6 |
|---------------+----------+----------------------+----------|
| Turbo switch | J3 | 32-bit external | S1 |
| | | memory card | |
|---------------+----------+----------------------+----------|
| Reset switch | J4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select color | JP10 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP10 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | NPU disabled | JP13 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | NPU enabled | JP13 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | NPU mode select asynchronous | JP14 | pins 1 & 2 |
| | with CPU | | closed |
|---+----------------------------------+--------+------------|
| | NPU mode select synchronous with | JP14 | pins 2 & 3 |
| | CPU | | closed |
|---+----------------------------------+--------+------------|
| » | CPU speed select fast | JP15 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU speed select slow | JP15 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|--------------+----------------------+----------------------|
| 1MB | (4) 256K x 9 | NONE |
|--------------+----------------------+----------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|--------------+----------------------+----------------------|
| 4MB | (4) 1M x 9 | NONE |
|--------------+----------------------+----------------------|
| 5MB | (4) 256K x 9 | (4) 1M x 9 |
|--------------+----------------------+----------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP2 | JP3 | JP4 | JP5 | JP6 | JP7 | JP8 |
|------+------+------+------+------+------+------+-----+-----|
| 1MB |Closed|Closed|Closed|Closed|2 & 3 | Open |Open |Open |
|------+------+------+------+------+------+------+-----+-----|
| 2MB |Closed|Closed|Closed|Closed|2 & 3 |2 & 3 |Open |Open |
|------+------+------+------+------+------+------+-----+-----|
| 4MB |Closed|Closed| Open | Open |1 & 2 | Open |Open |Open |
|------+------+------+------+------+------+------+-----+-----|
| 5MB |Closed| Open |Closed|Closed|2 & 3 |1 & 2 |Open |Open |
|------+------+------+------+------+------+------+-----+-----|
| 8MB |Closed| Open | Open |Closed|1 & 2 |1 & 2 |Open |Open |
|------------------------------------------------------------|
|Note:Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | TAG |
|------------------+--------------------+--------------------|
| 64KB | (8) 64K x 1 | (2) 64K x 1 |
|------------------+--------------------+--------------------|
| 256KB | (8) 256K x 1 | (2) 256K x 1 |
+------------------------------------------------------------+