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# PROMISE TECHNOLOGY, INC.
DC420
+------------------------------------------------------------+
|------------------------------------------------------------|
| Data bus: | 32-bit, VL-bus |
|-------------------+----------------------------------------|
| Size: | Three/quarter-length, full-height card |
|-------------------+----------------------------------------|
| Hard drive | Two IDE (AT) interface drives |
| supported: | |
|-------------------+----------------------------------------|
| Floppy drives | Two 360KB, 720KB, 1.2MB or 1.44MB |
| supported: | drives |
+------------------------------------------------------------+
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|-----------------------------------------------+------------|
| 25-pin parallel port - external | CN1 |
|-----------------------------------------------+------------|
| 9-pin serial port 1 - external | CN2 |
|-----------------------------------------------+------------|
| 10-pin serial port 2 - internal | CN3 |
|-----------------------------------------------+------------|
| 34-pin control cable connector - floppy drive | J1 |
|-----------------------------------------------+------------|
| 40-pin IDE (AT) Interface connector | J3 |
|-----------------------------------------------+------------|
| 4-pin connector - drive active LED | JP3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|------------------------------------+----------+------------|
| » | Main board supports VL-bus ID3 | JP1 | pins 1 & 2 |
| | (speed < 50MHz) | | closed |
|---+--------------------------------+----------+------------|
| | Main board does not support | JP1 | pins 2 & 3 |
| | VL-bus ID3 (speed > 50MHz) | | closed |
|---+--------------------------------+----------+------------|
| » | Factory configured - do not | JP2 | pins 1 & 2 |
| | alter | | closed |
|---+--------------------------------+----------+------------|
| » | Floppy drive enabled | JP4/G | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+----------+------------|
| | Floppy drive disabled | JP4/G | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 (CN2) CONFIGURATION |
|------------------------------------------------------------|
| COM/Address/IRQ | JP4/A | JP4/B |
|--------------------+-------------------+-------------------|
| » | COM1/3F8h/IRQ4 | pins 1 & 2 closed | pins 2 & 3 closed |
|---+----------------+-------------------+-------------------|
| | COM3/3E8h/IRQ4 | pins 2 & 3 closed | pins 1 & 2 closed |
|---+----------------+-------------------+-------------------|
| | Disabled | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 (CN3) CONFIGURATION |
|------------------------------------------------------------|
| COM/Address/IRQ | JP4/C | JP4/D |
|--------------------+-------------------+-------------------|
| » | COM2/2F8h/IRQ3 | pins 1 & 2 closed | pins 2 & 3 closed |
|---+----------------+-------------------+-------------------|
| | COM4/2E8h/IRQ3 | pins 2 & 3 closed | pins 1 & 2 closed |
|---+----------------+-------------------+-------------------|
| | Disabled | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT (CN1) CONFIGURATION |
|------------------------------------------------------------|
| Address/IRQ | JP4/E | JP4/F | JP4/H |
|---------------+------------------+------------+------------|
| » | 378h/IRQ7 | pin 1 & 2 closed | pins 2 & 3 | pins 2 & 3 |
| | | | closed | closed |
|---+-----------+------------------+------------+------------|
| | 3BCh/IRQ7 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed | closed |
|---+-----------+------------------+------------+------------|
| | 278h/IRQ5 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed | closed |
|---+-----------+------------------+------------+------------|
| | Disabled | pins 2 & 3 | pins 2 & 3 | all pins |
| | | closed | closed | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT BI-DIRECTIONAL FUNCTION |
|------------------------------------------------------------|
| Setting | JP5 |
|-------------------------------+----------------------------|
| Bi-directional | open |
|-------------------------------+----------------------------|
| Uni-directional | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| » | 512KB | (1) 512K x 8 | None |
|---+--------------+--------------------+--------------------|
| | 1MB | (1) 512K x 8 | (4) 256K x 4 |
+------------------------------------------------------------+