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# BOCA RESEARCH, INC.
DELL 486DX/XX REV.3 I/O CARD
+------------------------------------------------------------+
|------------------------------------------------------------|
| Data bus: | 16-bit, ISA |
|-------------------+----------------------------------------|
| Size: | Half-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 | CN1 |
|-----------------------------------------------+------------|
| 10-pin serial port - external | CN2 |
|-----------------------------------------------+------------|
| 10-pin serial port - internal | J3 |
|-----------------------------------------------+------------|
| 40-pin IDE(AT) interface connector | J4 |
|-----------------------------------------------+------------|
| 34-pin control cable connector - floppy drive | J5 |
|-----------------------------------------------+------------|
| 4-pin connector - drive active LED | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 (CN2) CONFIGURATION |
|------------------------------------------------------------|
| COM/Address/IRQ | J7 |
|----------------------------+-------------------------------|
| » | COM1/3F8h/IRQ4 | pins 1 & 3, 19 & 21 closed |
|---+------------------------+-------------------------------|
| | COM1/3F8h/IRQ3 | pins 1 & 3, 21 & 23 closed |
|---+------------------------+-------------------------------|
| | COM1/3F8h/IRQ5 | pins 1 & 3, 15 & 17 closed |
|---+------------------------+-------------------------------|
| | COM1/3F8h/IRQ7 | pins 1 & 3, 13 & 15 closed |
|---+------------------------+-------------------------------|
| | COM2/2F8h/IRQ3 | pins 3 & 5, 21 & 23 closed |
|---+------------------------+-------------------------------|
| | COM2/2F8h/IRQ4 | pins 3 & 5, 19 & 21 closed |
|---+------------------------+-------------------------------|
| | COM2/2F8h/IRQ5 | pins 3 & 5, 15 & 17 closed |
|---+------------------------+-------------------------------|
| | COM2/2F8h/IRQ7 | pins 3 & 5, 13 & 15 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT INTERRUPT SELECTION |
|------------------------------------------------------------|
| IRQ | J7 |
|----------------------------+-------------------------------|
| » | COM1/3F8h/IRQ4 | pins 1 & 3, 19 & 21 closed |
|---+------------------------+-------------------------------|
| | COM1/3F8h/IRQ3 | pins 1 & 3, 21 & 23 closed |
|---+------------------------+-------------------------------|
| | COM1/3F8h/IRQ5 | pins 1 & 3, 15 & 17 closed |
|---+------------------------+-------------------------------|
| | COM1/3F8h/IRQ7 | pins 1 & 3, 13 & 15 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 (CN2) CONFIGURATION |
|------------------------------------------------------------|
| COM/Address/IRQ | J7 |
|----------------------------+-------------------------------|
| COM3/3E8h/IRQ3 | pins 7 & 9, 21 & 23 closed |
|----------------------------+-------------------------------|
| COM3/3E8h/IRQ4 | pins 7 & 9, 19 & 21 closed |
|----------------------------+-------------------------------|
| COM3/3E8h/IRQ5 | pins 7 & 9, 15 & 17 closed |
|----------------------------+-------------------------------|
| COM3/3E8h/IRQ7 | pins 7 & 9, 13 & 15 closed |
|----------------------------+-------------------------------|
| COM4/2E8h/IRQ3 | pins 9 & 11, 21 & 23 closed |
|----------------------------+-------------------------------|
| COM4/2E8h/IRQ4 | pins 9 & 11, 19 & 21 closed |
|----------------------------+-------------------------------|
| COM4/2E8h/IRQ5 | pins 9 & 11, 15 & 17 closed |
|----------------------------+-------------------------------|
| COM4/2E8h/IRQ7 | pins 9 & 11, 13 & 15 closed |
|----------------------------+-------------------------------|
| Disabled | pins 1, 3, 5, 7, 9 & 11 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 (J3) CONFIGURATION |
|------------------------------------------------------------|
| COM/Address/IRQ | J7 |
|----------------------------+-------------------------------|
| » | COM2/2F8h/IRQ3 | pins 4 & 6, 22 & 24 closed |
|---+------------------------+-------------------------------|
| | COM2/2F8h/IRQ4 | pins 4 & 6, 20 & 22 closed |
|---+------------------------+-------------------------------|
| | COM2/2F8h/IRQ5 | pins 4 & 6, 16 & 18 closed |
|---+------------------------+-------------------------------|
| | COM2/2F8h/IRQ7 | pins 4 & 6, 14 & 16 closed |
|---+------------------------+-------------------------------|
| | COM1/3F8h/IRQ3 | pins 2 & 4, 22 & 24 closed |
|---+------------------------+-------------------------------|
| | COM1/3F8h/IRQ4 | pins 2 & 4, 20 & 22 closed |
|---+------------------------+-------------------------------|
| | COM1/3F8h/IRQ5 | pins 2 & 4, 16 & 18 closed |
|---+------------------------+-------------------------------|
| | COM1/3F8h/IRQ7 | pins 2 & 4, 14 & 16 closed |
|---+------------------------+-------------------------------|
| | COM3/3E8h/IRQ3 | pins 8 & 10, 22 & 24 closed |
|---+------------------------+-------------------------------|
| | COM3/3E8h/IRQ4 | pins 8 & 10, 20 & 22 closed |
|---+------------------------+-------------------------------|
| | COM3/3E8h/IRQ5 | pins 8 & 10, 16 & 18 closed |
|---+------------------------+-------------------------------|
| | COM3/3E8h/IRQ7 | pins 8 & 10, 14 & 16 closed |
|---+------------------------+-------------------------------|
| | COM4/2E8h/IRQ3 | pins 10 & 12, 22 & 24 closed |
|---+------------------------+-------------------------------|
| | COM4/2E8h/IRQ4 | pins 10 & 12, 20 & 22 closed |
|---+------------------------+-------------------------------|
| | COM4/2E8h/IRQ5 | pins 10 & 12, 16 & 18 closed |
|---+------------------------+-------------------------------|
| | COM4/2E8h/IRQ7 | pins 10 & 12, 14 & 16 closed |
|---+------------------------+-------------------------------|
| | Disabled | pins 2, 4, 6, 8, 10 & 12 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT (CN1) CONFIGURATION |
|------------------------------------------------------------|
| LPT/Address/IRQ | J8 |
|----------------------------+-------------------------------|
| » | LPT1/278h/IRQ7 | pins 1 & 2, 4 & 5 closed |
|---+------------------------+-------------------------------|
| | LPT1/278h/IRQ5 | pins 1 & 2, 5 & 6 closed |
|---+------------------------+-------------------------------|
| | LPT2/378h/IRQ5 | pins 2 & 3, 5 & 6 closed |
|---+------------------------+-------------------------------|
| | LPT2/378h/IRQ7 | pins 2 & 3, 4 & 5 closed |
|---+------------------------+-------------------------------|
| | Disabled | all pins open |
+------------------------------------------------------------+