This information is for a 44pin IDE interface, the 44 pin interface is for
2. 5 inch HD's, the only difference is that the 4 extra pins supply power
the other 40 pins are the same.


    The pinouts are as follows:  (_NAME means signal active low)

    Name      2.5"   3.5"    Desc
    _RESET  |   1  |   1  |  Drive reset
    GROUND  |   2  |   2  |
    DD7     |   3  |   3  |  Drive data bus bit 7
    DD8     |   4  |   4  |  Drive data bus bit 8
    DD6     |   5  |   5  |  Drive data bus bit 6
    DD9     |   6  |   6  |  Drive data bus bit 9
    DD5     |   7  |   7  |  Drive data bus bit 5
    DD10    |   8  |   8  |  Drive data bus bit 10
    DD4     |   9  |   9  |  Drive data bus bit 4
    DD11    |  10  |  10  |  Drive data bus bit 11
    DD3     |  11  |  11  |  Drive data bus bit 3
    DD12    |  12  |  12  |  Drive data bus bit 12
    DD2     |  13  |  13  |  Drive data bus bit 2
    DD13    |  14  |  14  |  Drive data bus bit 13
    DD1     |  15  |  15  |  Drive data bus bit 1
    DD14    |  16  |  16  |  Drive data bus bit 14
    DD0     |  17  |  17  |  Drive data bus bit 0
    DD15    |  18  |  18  |  Drive data bus bit 15
    GROUND  |  19  |  19  |
    key     |  20  |  20  |  Key for interface connector
    DMARQ   |  21  |  21  |  DMA request (not supported yet)
    GROUND  |  22  |  22  |
    _DIOW   |  23  |  23  |  Drive I/O write
    GROUND  |  24  |  24  |
    _DIOR   |  25  |  25  |  Drive I/O read
    GROUND  |  26  |  26  |
    IORDY   |  27  |  27  |  I/O channel ready
    SPSYNC  |  28  |  28  |  Spindle sync (not supported yet)
    _DMACK  |  29  |  29  |  DMA acknowledge (not supported yet)
    GROUND  |  30  |  30  |
    INTRQ   |  31  |  31  |  Drive interrupt
    _IOCS16 |  32  |  32  |  Drive 16 bit I/O
    DA1     |  33  |  33  |  Drive address bus bit 1
    _PDIAG  |  34  |  34  |  Passed diagnostics
    DA0     |  35  |  35  |  Drive address bus bit 0
    DA2     |  36  |  36  |  Drive address bus bit 2
    _CS1FX  |  37  |  37  |  Chip select 0
    _CS3FX  |  38  |  38  |  Chip select 1
    _DASP   |  39  |  39  |  Drive active/slave present
    GROUND  |  40  |  40  |
    +5v     |  41  |  --  |  +5v supply
    +5v     |  42  |  --  |  +5v supply
    GROUND  |  43  |  --  |
    RESERVED|  44  |  --  |  Reserved for future definition

    As you can see, apart from the power pins, all the signals are exactly
the
same.  The ones that say 'not supported yet' should still be connected.
The 44pin connector isn't a normal .1" IDC header, it's more like .075".
Spacing of the pins is 2mm with a 1mm cable.