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# SEA LEVEL SYSTEMS, INC.
ACB-III
Card Type Serial card
Chip Set Unidentified
I/O Options Serial port
Data Bus 8-bit ISA
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label |
|-------------------------------+----------------------------|
| Serial port | P1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured – do not | E1 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured – do not | E7 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| | DMA tri state drivers | E9 | Pins 1 & 3 |
| | permanently enabled | | closed |
|---+---------------------------------+-------+--------------|
| | DMA tri state drivers enabled | E9 | Pins 2 & 4 |
| | by status control port bit 7 | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured – do not | E11 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured – do not | E12 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured – do not | E13 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured – do not | E14 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured – do not | SW2 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 SELECTION |
|------------------------------------------------------------|
| Setting | E6 |
|----------------------------------------+-------------------|
| » | Transmit clock output (TXC out) | Pins 1 & 2 closed |
|---+------------------------------------+-------------------|
| | Transmit clock input (TXC in) | Pins 3 & 4 closed |
|---+------------------------------------+-------------------|
| | Terminal timing source from SCC | Pins 5 & 6 closed |
| | TRXC pin or input to TXC pin 24 on | |
| | P1 | |
|---+------------------------------------+-------------------|
| | Terminal timing source input to | Pins 7 & 8 closed |
| | RXC pins is echoed to pin 24 on P1 | |
|---+------------------------------------+-------------------|
| | Receive clock input | Pins 11 & 12 |
| | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 SELECTION |
|------------------------------------------------------------|
| Setting | E3 |
|----------------------------------------+-------------------|
| » | Transmit clock output (TXC out) | Pins 1 & 2 closed |
|---+------------------------------------+-------------------|
| | Transmit clock input (TXC in) | Pins 3 & 4 closed |
|---+------------------------------------+-------------------|
| | Terminal timing source from SCC | Pins 5 & 6 closed |
| | TRXC pin or input to TXC pin 24 on | |
| | P1 | |
|---+------------------------------------+-------------------|
| | Terminal timing source input to | Pins 7 & 8 closed |
| | RXC pins is echoed to pin 24 on P1 | |
|---+------------------------------------+-------------------|
| | Receive clock input | Pins 11 & 12 |
| | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INPUT/OUTPUT CLOCK MODE SELECTION (PORT 1) |
|------------------------------------------------------------|
| Setting | E10 |
|-------------------------------+----------------------------|
| Transmit clock output | Pins 1 & 2 closed |
|-------------------------------+----------------------------|
| Transmit clock input | Pins 3 & 4 closed |
|-------------------------------+----------------------------|
| Not used | Pins 5 & 6 open |
|-------------------------------+----------------------------|
| Receive clock input | Pins 7 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INPUT/OUTPUT CLOCK MODE SELECTION (PORT 2) |
|------------------------------------------------------------|
| Setting | E2 |
|-------------------------------+----------------------------|
| Transmit clock output | Pins 1 & 2 closed |
|-------------------------------+----------------------------|
| Transmit clock input | Pins 3 & 4 closed |
|-------------------------------+----------------------------|
| Not used | Pins 5 & 6 open |
|-------------------------------+----------------------------|
| Receive clock input | Pins 7 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT INTERRUPT SELECTION |
|------------------------------------------------------------|
| IRQ | E8 |
|------------------------------+-----------------------------|
| | 2/9 | Pins 1 & 2 closed |
|---+--------------------------+-----------------------------|
| | 3 | Pins 3 & 4 closed |
|---+--------------------------+-----------------------------|
| | 4 | Pins 5 & 6 closed |
|---+--------------------------+-----------------------------|
| » | 5 | Pins 7 & 8 closed |
|---+--------------------------+-----------------------------|
| | Normal IRQ mode | Pins 9 & 10 closed |
|---+--------------------------+-----------------------------|
| | Multi IRQ mode | Pins 11 & 12 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE I/O ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting | SW1/1 | SW1/2 |SW1/3 |SW1/4 |SW1/5 |SW1/6 |SW1/7 |
|---------+-------+-------+------+------+------+------+------|
|» | 238 | Off | On | On | On | Off | Off | Off |
|--+------+-------+-------+------+------+------+------+------|
| | 280 | Off | On | Off | On | On | On | On |
|--+------+-------+-------+------+------+------+------+------|
| | 2A0 | Off | On | Off | On | Off | On | On |
|--+------+-------+-------+------+------+------+------+------|
| | 2E8 | Off | On | Off | Off | Off | On | Off |
|--+------+-------+-------+------+------+------+------+------|
| | 300 | Off | Off | On | On | On | On | On |
|--+------+-------+-------+------+------+------+------+------|
| | 328 | Off | Off | On | On | Off | On | Off |
|--+------+-------+-------+------+------+------+------+------|
| | 3E8 | Off | Off | Off | Off | Off | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL SELECTION |
|------------------------------------------------------------|
| Channel | E4 |
|--------------------------------------+---------------------|
| 1 – two channel mode | Pins 1 & 2 closed |
|--------------------------------------+---------------------|
| 3 – two channel mode | Pins 1 & 2 closed |
|--------------------------------------+---------------------|
| Two channel A/B mode A3B1 | Pins 3 & 4 closed |
|--------------------------------------+---------------------|
| Two channel A/B mode A1B3 | Pins 5 & 6 closed |
|--------------------------------------+---------------------|
| Closed = channel A, Open = channel B | Pins 7 & 8 |
|--------------------------------------+---------------------|
| 3 – acknowledges channel 3 | Pins 9 & 10 closed |
|--------------------------------------+---------------------|
| 1 – acknowledges channel 1 | Pins 11 & 12 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA SELECTION |
|------------------------------------------------------------|
| Setting | E5 |
|--------------------------------------+---------------------|
| SCC channel A/B uses channel 3 | Pins 1 & 2 closed |
|--------------------------------------+---------------------|
| SCC channel A uses channel 3 | Pins 3 & 4 closed |
|--------------------------------------+---------------------|
| SCC channel A/B uses channel 1 | Pins 5 & 6 closed |
|--------------------------------------+---------------------|
| SCC channel A uses channel 1 | Pins 7 & 8 closed |
|--------------------------------------+---------------------|
| SCC channel B enabled for half | Pins 9 & 10 closed |
| duplex DMA transfers | |
|--------------------------------------+---------------------|
| SCC channel A – DMA channel 1/3 for | Pins 11 & 12 closed |
| full duplex transfers | |
+------------------------------------------------------------+