RadiSys EXM-9 Reference page 21

Programming Interface
respond to reads from I/O port 100h and reads and writes from I/O port 102h, and
then only if EXMbus line -EXMID is asserted.
The addresses 1F0-1F7 and 3F6-3F7 are interpreted by the integrated controller in the
external IDE drive. Note that both the IDE interface and the floppy controller use
address 3F7. Because of this, you cannot build a system containing an EXM-9 where
the floppy controller function is being handled by some other device (e.g., another
EXM-9, an EXM-3, an EXP-MS/MX); if you are using an EXM-9 and a floppy
diskette drive, the floppy drive must be controlled by the EXM-9.
For an explanation of the IDE registers, refer to documentation on any standard
PC/AT fixed-disk interface. For an explanation of the floppy diskette controller
registers, refer to documentation on the WD37C65 controller chip.
4 4
The floppy diskette controller in the EXM-9 uses interrupt IRQ6 and DMA channel
2. The IDE interface uses interrupt IRQ14.
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