TEXT View Source
# UNIDENTIFIED
1200/300 BAUD MODEM
Modem Type Data (synchronous/asynchronous)
Maximum Data Rate 1200bps
Data Bus 8-bit ISA
Data Modulation Protocol Bell 103 & 212A, ITU-T V.22
Error Correction/Compression Unidentified
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Line-in | J1 | Line-out | J2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECT - JP1 |
|------------------------------------------------------------|
| í IRQ | Jumper A | Jumper B | Jumper C | Jumper D |
|----------+------------+------------+-----------+-----------|
| » IRQ4 | Open | Open | Closed | Open |
|----------+------------+------------+-----------+-----------|
| í IRQ2 | Closed | Open | Open | Open |
|----------+------------+------------+-----------+-----------|
| í IRQ3 | Open | Closed | Open | Open |
|----------+------------+------------+-----------+-----------|
| í IRQ5 | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ADDRESS SELECT |
|------------------------------------------------------------|
| í COM/Address | SW1/1 | SW1/2 |
|--------------------+-------------------+-------------------|
| » COM1/3F8h | Off | Off |
|--------------------+-------------------+-------------------|
| í COM2/2F8h | Off | On |
|--------------------+-------------------+-------------------|
| í COM3/3E8h | On | Off |
|--------------------+-------------------+-------------------|
| í COM4/2E8h | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RECEIVED LINE SIGNAL DETECT BIT (RLSD) |
|------------------------------------------------------------|
| í Setting | SW1/3 |
|----------------------------------------------------+-------|
| » RLSD bit reset/carrier detect status written to | Off |
| modem status register. | |
|----------------------------------------------------+-------|
| í RLSD bit written to modem status register. | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA TERMINAL READY (DTR) |
|------------------------------------------------------------|
| í Setting | SW1/4 |
|----------------------------------------------------+-------|
| » DTR bit status written to the UART modem control | Off |
| register. | |
|----------------------------------------------------+-------|
| í DTR bit is ignored. | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PROTOCOL SELECT |
|------------------------------------------------------------|
| Protocol | SW1/5 |
|----------------------------------+-------------------------|
| » Bell 103 & 212A enabled. | Off |
|----------------------------------+-------------------------|
| í CCITT V.22 enabled. | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MAKE/BREAK RATIO |
|------------------------------------------------------------|
| í Setting | SW1/6 |
|----------------------------------+-------------------------|
| » 39/61 ratio (Bell standard). | Off |
|----------------------------------+-------------------------|
| í 33/67 ratio (CCITT standard). | On |
+------------------------------------------------------------+