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                                 |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/c/A-B/20548-1.png>
   

   +------------------------------------------------------------+
   |                        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         |
   +------------------------------------------------------------+