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# ZENITH DATA SYSTEMS
LAN4TR-AT
NIC Type Token-Ring
Transfer Rate 4Mbps
Data Bus 16-bit ISA
Topology Ring
Wiring Type Shielded/Unshielded twisted pair
Boot ROM Available
IMG IMG 1
+------------------------------------------------------------+
| LLC EPROM ENABLED |
|------------------------------------------------------------|
| Setting | JP1 |
|----------------------------------------------+-------------|
| ยป | External EPROMs disabled | Closed |
|--------+-------------------------------------+-------------|
| | External EPROMs enabled | Open |
|------------------------------------------------------------|
| Note:The LLC EPROMs contain the Logic Link Control |
| program. The card will function properly with the LLC |
| chips |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O BASE ADDRESS |
|------------------------------------------------------------|
| Address | SW1/1 | SW1/2 |
|--------------------+-------------------+-------------------|
| A00 - A0Fh | On | On |
|--------------------+-------------------+-------------------|
| A20 - A2Fh | On | Off |
|--------------------+-------------------+-------------------|
| A40 - A4Fh | Off | On |
|--------------------+-------------------+-------------------|
| A60 - A6Fh | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT REQUEST |
|------------------------------------------------------------|
| IRQ | SW1/3 | SW1/4 |
|------------------+--------------------+--------------------|
| 3 | On | On |
|------------------+--------------------+--------------------|
| 9 | On | Off |
|------------------+--------------------+--------------------|
| 10 | Off | On |
|------------------+--------------------+--------------------|
| 11 | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BOOT ROM ADDRESS |
|------------------------------------------------------------|
| Address | Boot ROM Size | SW1/5 | SW1/6 |
|----------------+---------------+-------------+-------------|
| CC000 - CCFFFh | 4KB | On | On |
|----------------+---------------+-------------+-------------|
| D0000 - D3FFFh | 16KB | On | Off |
|----------------+---------------+-------------+-------------|
| D8000 - D8FFFh | 4KB | Off | On |
|----------------+---------------+-------------+-------------|
| DC000 - DFFFFh | 16KB | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL |
|------------------------------------------------------------|
| Channel | SW1/7 | SW1/8 |
|--------------------+-------------------+-------------------|
| DMA0 | On | On |
|--------------------+-------------------+-------------------|
| DMA5 | On | Off |
|--------------------+-------------------+-------------------|
| DMA6 | Off | On |
|--------------------+-------------------+-------------------|
| DMA7 | Off | Off |
+------------------------------------------------------------+