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# ZENITH DATA SYSTEMS
Z-157 MODEL 2/MODEL 3
Processor 8088
Processor Speed 4.77MHz
Chip Set Unidentified
Max. Onboard DRAM 640KB
Cache None
BIOS Unidentified
Dimensions 254mm x 218mm
I/O Options Parallel port/keyboard slot
NPU Options 8087
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location |
|----------------------------------------+-------------------|
| Propietary parallel port/keyboard slot | S1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Switch | Position |
|----------------------------------------+--------+----------|
| » | RAM parity checking enabled | SW1/2 | On |
|---+------------------------------------+--------+----------|
| | RAM parity checking disabled | SW1/2 | Off |
|---+------------------------------------+--------+----------|
| » | RAM over 256KB on mother board | SW1/3 | On |
|---+------------------------------------+--------+----------|
| | RAM over 256KB on external memory | SW1/3 | Off |
| | card | | |
|---+------------------------------------+--------+----------|
| » | Parallel port enabled | SW1/6 | On |
|---+------------------------------------+--------+----------|
| | Parallel port disabled | SW1/6 | Off |
|---+------------------------------------+--------+----------|
| » | Floppy controller enabled | SW1/7 | On |
|---+------------------------------------+--------+----------|
| | Floppy controller disabled | SW1/7 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 512KB | (9) 41256 | (9) 41256 | NONE |
|------------+---------------+---------------+---------------|
| 640KB | (9) 41256 | (9) 41256 | (9) 4164 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BOOT CONFIGURATION |
|------------------------------------------------------------|
| Setting | SW1/0 | SW1/1 |
|---------------------+-------------------+------------------|
| MFM-150 Monitor RAM | Off | Off |
|---------------------+-------------------+------------------|
| MFM-150 Monitor RAM | On | On |
|---------------------+-------------------+------------------|
| Floppy disk | Off | On |
|---------------------+-------------------+------------------|
| Hard Drive | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR CONFIGURATION |
|------------------------------------------------------------|
| Setting | SW1/4 | SW1/5 |
|--------------------+-------------------+-------------------|
| Monochrome | Off | Off |
|--------------------+-------------------+-------------------|
| CGA | On | Off |
|--------------------+-------------------+-------------------|
| EGA | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note: Position 1 on SW1 is unidentified. |
+------------------------------------------------------------+