DIAMOND FLOWER, INC.
====================

   MIO-550 (REV.C/D)

   Card Type            Hard drive controller                     
   Hard Drives          Two IDE (AT) drives                       
   supported            
   Floppy drives        Two 360KB, 720KB, 1.2MB, or 1.44MB drives 
   supported            
   Data Bus             16-bit ISA                                
   Card Size            Half-length, full-height                  

<gopher://bitreich.org/I/th99/c/C-D/21451-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |     Function      | Location |     Function     | Location |
   |-------------------+----------+------------------+----------|
   | 2-pin connector - |    J1    | 40-pin IDE(AT)   |    J5    |
   | drive active LED  |          | connector        |          |
   |-------------------+----------+------------------+----------|
   | 34-pin cable      |    J2    | 9-pin serial     |    J6    |
   | connector -       |          | port 1 -         |          |
   | floppy drive      |          | external         |          |
   |-------------------+----------+------------------+----------|
   | 16-pin game port  |    J3    | 25-pin parallel  |    J8    |
   |                   |          | port - external  |          |
   |-------------------+----------+------------------+----------|
   | 10-pin serial     |    J4    |                  |          |
   | port 2 - internal |          |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              |  Label   |  Position  |
   |------------------------------------+----------+------------|
   |>> | Serial port 1 DMA enabled      | JP1/pins |   Closed   |
   |   |                                |  1 & 3   |            |
   |---+--------------------------------+----------+------------|
   |   | Serial port 1 DMA disabled     | JP1/pins |    Open    |
   |   |                                |  1 & 3   |            |
   |---+--------------------------------+----------+------------|
   |>> | Serial port 2 DMA enabled      | JP1/pins |   Closed   |
   |   |                                |  2 & 4   |            |
   |---+--------------------------------+----------+------------|
   |   | Serial port 2 DMA disabled     | JP1/pins |    Open    |
   |   |                                |  2 & 4   |            |
   |---+--------------------------------+----------+------------|
   |>> | 1.8432MHz input clock of UART  |   JP2    | Pins 2 & 3 |
   |   | enabled                        |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | 7.3728MHz input clock of UART  |   JP2    | Pins 1 & 2 |
   |   | enabled                        |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Game port enabled              |  JP3/11  |   Closed   |
   |---+--------------------------------+----------+------------|
   |   | Game port disabled             |  JP3/11  |    Open    |
   |---+--------------------------------+----------+------------|
   |>> | Floppy drive interface enabled |  JP3/12  |   Closed   |
   |---+--------------------------------+----------+------------|
   |   | Floppy drive interface         |  JP3/12  |    Open    |
   |   | disabled                       |          |            |
   |---+--------------------------------+----------+------------|
   |>> | IDE(AT) interface enabled      |  JP3/13  |   Closed   |
   |---+--------------------------------+----------+------------|
   |   | IDE(AT) interface disabled     |  JP3/13  |    Open    |
   |---+--------------------------------+----------+------------|
   |>> | Parallel port is               |   JP6    |   Closed   |
   |   | uni-directional                |          |            |
   |---+--------------------------------+----------+------------|
   |   | Parallel port is               |   JP6    |    Open    |
   |   | bi-directional                 |          |            |
   |------------------------------------------------------------|
   |      Note:When the 1.8432MHz is selected, the MIO-550      |
   |      supports up to 56K bps. When the 7.3728MHz clock is   |
   |      selected, the MIO-550 supports up to 448K bps.        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |            SERIAL PORT 1 DMA CHANNEL SELECTION             |
   |------------------------------------------------------------|
   |    Channel     | JP5/pins | JP5/pins | JP5/pins | JP5/pins |
   |                |  1 & 2   |  3 & 4   |  5 & 6   |  7 & 8   |
   |----------------+----------+----------+----------+----------|
   |>> | 1          |   Open   |  Closed  |   Open   |  Closed  |
   |   | (receive)  |          |          |          |          |
   |---+------------+----------+----------+----------+----------|
   |   |     1      | Pins 1 & |   Open   |  Closed  |          |
   |   | (transmit) | 3 closed |          |          |          |
   |---+------------+----------+----------+----------|          |
   |   |     3      | Pins 2 & |  Closed  |   Open   |          |
   |   | (receive)  | 4 closed |          |          |          |
   |---+------------+----------+----------+----------+----------|
   |   |     3      |  Closed  |   Open   |  Closed  |   Open   |
   |   | (transmit) |          |          |          |          |
   |------------------------------------------------------------|
   |      Note:When selecting DMA, make sure JP1/pins 1 & 3 are |
   |      closed.                                               |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |            SERIAL PORT 2 DMA CHANNEL SELECTION             |
   |------------------------------------------------------------|
   |    Channel     | JP5/pins | JP5/pins | JP5/pins | JP5/pins |
   |                |  9 & 10  | 11 & 12  | 13 & 14  | 15 & 16  |
   |----------------+----------+----------+----------+----------|
   |   |     1      |   Open   |  Closed  |   Open   |  Closed  |
   |   | (receive)  |          |          |          |          |
   |---+------------+----------+----------+----------+----------|
   |   |     1      | Pins 9 & |   Open   |  Closed  |          |
   |   | (transmit) |    11    |          |          |          |
   |   |            |  closed  |          |          |          |
   |---+------------+----------+----------+----------|          |
   |>> |     3      | Pins 10  |  Closed  |   Open   |          |
   |   | (receive)  |   & 12   |          |          |          |
   |   |            |  closed  |          |          |          |
   |---+------------+----------+----------+----------+----------|
   |   |     3      |  Closed  |   Open   |  Closed  |   Open   |
   |   | (transmit) |          |          |          |          |
   |------------------------------------------------------------|
   |      Note:When selecting DMA, make sure JP1/pins 2 & 4 are |
   |      closed.                                               |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              PARALLEL PORT ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |        Setting         |      JP3/9      |     JP3/10      |
   |------------------------+-----------------+-----------------|
   |>> | LPT1 (378h)        |      Open       |     Closed      |
   |---+--------------------+-----------------+-----------------|
   |   |    LPT2 (278h)     |     Closed      |      Open       |
   |---+--------------------+-----------------+-----------------|
   |   |      Disabled      |      Open       |      Open       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT 1 ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |     Setting     |  JP3/1   |  JP3/2   |  JP3/3   |  JP3/4  |
   |-----------------+----------+----------+----------+---------|
   |>> | COM1 (3F8h) |   Open   |   Open   |   Open   | Closed  |
   |---+-------------+----------+----------+----------+---------|
   |   | COM2 (2F8h) |   Open   |  Closed  |   Open   |  Open   |
   |---+-------------+----------+----------+----------+---------|
   |   | COM3 (3E8h) |   Open   |   Open   |  Closed  |  Open   |
   |---+-------------+----------+----------+----------+---------|
   |   | COM4 (2E8h) |  Closed  |   Open   |   Open   |  Open   |
   |---+-------------+----------+----------+----------+---------|
   |   |  Disabled   |   Open   |   Open   |   Open   |  Open   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT 2 ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |     Setting     |  JP3/5   |  JP3/6   |  JP3/7   |  JP3/8  |
   |-----------------+----------+----------+----------+---------|
   |   | COM1 (3F8h) |   Open   |   Open   |   Open   | Closed  |
   |---+-------------+----------+----------+----------+---------|
   |>> | COM2 (2F8h) |   Open   |  Closed  |   Open   |  Open   |
   |---+-------------+----------+----------+----------+---------|
   |   | COM3 (3E8h) |   Open   |   Open   |  Closed  |  Open   |
   |---+-------------+----------+----------+----------+---------|
   |   | COM4 (2E8h) |  Closed  |   Open   |   Open   |  Open   |
   |---+-------------+----------+----------+----------+---------|
   |   |  Disabled   |   Open   |   Open   |   Open   |  Open   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 1 INTERRUPT SELECTION              |
   |------------------------------------------------------------|
   |     IRQ     |   JP4/1   |   JP4/2   |   JP4/3   |  JP4/4   |
   |-------------+-----------+-----------+-----------+----------|
   |   |  IRQ2   |  Closed   |   Open    |   Open    |   Open   |
   |---+---------+-----------+-----------+-----------+----------|
   |   |  IRQ3   |   Open    |   Open    |   Open    |  Closed  |
   |---+---------+-----------+-----------+-----------+----------|
   |>> |  IRQ4   |   Open    |   Open    |  Closed   |   Open   |
   |---+---------+-----------+-----------+-----------+----------|
   |   |  IRQ5   |   Open    |  Closed   |   Open    |   Open   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 2 INTERRUPT SELECTION              |
   |------------------------------------------------------------|
   |     IRQ     |   JP4/5   |   JP4/6   |   JP4/7   |  JP4/8   |
   |-------------+-----------+-----------+-----------+----------|
   |   |  IRQ2   |  Closed   |   Open    |   Open    |   Open   |
   |---+---------+-----------+-----------+-----------+----------|
   |>> |  IRQ3   |   Open    |   Open    |   Open    |  Closed  |
   |---+---------+-----------+-----------+-----------+----------|
   |   |  IRQ4   |   Open    |   Open    |  Closed   |   Open   |
   |---+---------+-----------+-----------+-----------+----------|
   |   |  IRQ5   |   Open    |  Closed   |   Open    |   Open   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             PARALLEL PORT INTERRUPT SELECTION              |
   |------------------------------------------------------------|
   |          IRQ          |      JP4/9       |     JP4/10      |
   |-----------------------+------------------+-----------------|
   |     |      IRQ5       |      Closed      |      Open       |
   |-----+-----------------+------------------+-----------------|
   |>>   | IRQ7            |       Open       |     Closed      |
   +------------------------------------------------------------+